Difference between revisions of "DESK-MX6UL-AN-0004: Using Python for Embedded applications"

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{{ImportantMessage|text=This application note has been validated using the '''kit version''' in the History table.}}
 
{{ImportantMessage|text=This application note has been validated using the '''kit version''' in the History table.}}
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!Development Kit version
 
!Development Kit version
 
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| {{oldid|14782|1.0.0}}
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| 1.0.0
 
| Oct 2021
 
| Oct 2021
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|{{oldid|14780|DESK-MX6UL-L 1.0.1}}
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|[[DESK-MX6UL-L/General/Release_Notes#DESK-MX6UL-L_1.0.1|DESK-MX6UL-L 1.0.1]]
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|-
 
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| 2.0.0
 
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| Apr 2022
 
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|[[DESK-MX6UL-L/General/Release_Notes#DESK-MX6UL-L_3.0.0|DESK-MX6UL-L 3.0.0]]
 
 
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As reported in [https://opensource.com/life/16/8/python-vs-cc-embedded-systems this] article ''The C/C++ programming languages dominate embedded systems programming, though they have a number of disadvantages. Python, on the other hand, has many strengths that make it a great language for embedded systems.''
 
As reported in [https://opensource.com/life/16/8/python-vs-cc-embedded-systems this] article ''The C/C++ programming languages dominate embedded systems programming, though they have a number of disadvantages. Python, on the other hand, has many strengths that make it a great language for embedded systems.''
  
−
This application note provides some examples of software packages installation that can be used for building an '''Industrial IoT Gateway''' adding <code>python3</code> libraries to the [[SBC_Lynx_SBC | SBC Lynx]] platform.
+
This application note provides some examples of software packages installation that can be used for adding <code>python3</code> libraries to the [[SBC_Lynx_SBC | SBC Lynx]] platform.
  
 
== Python on DESK ==
 
== Python on DESK ==
−
<code>python3</code> application is already present on [[DESK-MX6UL-L/Development/Building_the_Yocto_BSP#Quick_reference | DESK-MX6UL-L]] <code>dave-image-devel</code> root file system.
+
<code>python</code> and <code>python3</code> applications are already present on [[DESK-MX6UL-L/Development/Building_the_Yocto_BSP#Quick_reference | DESK-MX6UL-L]] <code>dave-image-devel</code> root file system.
 +
 
 +
Moreover, a huge list of ''python'' packages can be installed in the target using the [https://en.wikipedia.org/wiki/DNF_(software) DNF] package manager: the [[DESK-MX6UL-AN-0003:_Package_Management_with_Yocto_and_DNF | DESK-MX6UL-AN-0003]] shows how to install ''rpm'' packages in the target from the [http://yocto.dave.eu/desk-mx6ul-l-1.0.1/ DAVE's Yocto repository server].
  
 
== Installing python packages ==
 
== Installing python packages ==
Line 45: Line 38:
  
 
<pre class="board-terminal">
 
<pre class="board-terminal">
−
root@desk-mx6ul-lynx:~# python3 --version
+
root@desk-mx6ul-axelulite:~# python3 --version
−
Python 3.9.4
+
Python 3.5.5
−
root@desk-mx6ul-lynx:~#  
+
root@desk-mx6ul-axelulite:~# pip --version
 +
pip 20.3.4 from /usr/lib/python3.5/site-packages/pip (python 3.5)
 +
root@desk-mx6ul-axelulite:~# easy3_install --version
 +
setuptools 39.0.0 from /usr/lib/python3.5/site-packages (Python 3.5)
 +
root@desk-mx6ul-axelulite:~#
 
</pre>
 
</pre>
  
−
<code>pip3</code> is not present - ''by default'' - on standard root file system, but can be easily installed using python:
+
=== easy install===
 +
Even if <code>easy_install</code> tool [https://setuptools.pypa.io/en/latest/deprecated/easy_install.html has been deprecated], it is a useful tool still present in the typical python distributions.
 +
 
 +
For the purposes of this Application Note, the tool has been used to install some python packages typically used in an Industrial Gateway equipment
 +
 
 +
In this example, the following packages are installed using <code>easy3_install</code> (''easy_install'' version for python3): '''pyserial''' and '''pymodbus''' (for bus communications), '''[https://docs.python-requests.org/en/latest/ requests]''' (HTTP library), '''schema''', '''ssdp''':  
  
 
<pre class="board-terminal">
 
<pre class="board-terminal">
−
root@desk-mx6ul-lynx:~# curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
+
root@desk-mx6ul-axelulite:~# easy3_install pyserial
−
  % Total    % Received % Xferd  Average Speed  Time    Time    Time  Current
+
Searching for pyserial
−
                                Dload  Upload  Total  Spent    Left  Speed
+
Best match: pyserial 3.4
−
  0:00:01 --:--:-- 1846k
+
Adding pyserial 3.4 to easy-install.pth file
−
root@desk-mx6ul-lynx:~# python3 get-pip.py
+
 
−
Collecting pip
+
Using /usr/lib/python3.5/site-packages
−
  Downloading pip-21.3.1-py3-none-any.whl (1.7 MB)
+
Processing dependencies for pyserial
−
    |################| 1.7 MB 2.1 MB/s           
+
Finished processing dependencies for pyserial
−
Collecting setuptools
+
root@desk-mx6ul-axelulite:~# easy3_install pymodbus
−
  Downloading setuptools-60.5.0-py3-none-any.whl (958 kB)
+
Searching for pymodbus
−
    |###########| 958 kB 2.1 MB/s           
+
Reading https://pypi.python.org/simple/pymodbus/
−
Collecting wheel
+
Downloading https://files.pythonhosted.org/packages/57/21/6c9b1cade55161444450bdde6e953edb819d984beafee8d4baefa4f0310c/pymodbus-2.5.3rc1-py2.py3-none-any.whl#sha256=e8cbf3594a8dd0f71c287e24d8365e69836c8d22cac5ab288110638fd2b9fda6
−
  Downloading wheel-0.37.1-py2.py3-none-any.whl (35 kB)
+
Best match: pymodbus 2.5.3rc1
−
Installing collected packages: wheel, setuptools, pip
+
Processing pymodbus-2.5.3rc1-py2.py3-none-any.whl
−
Successfully installed pip-21.3.1 setuptools-60.5.0 wheel-0.37.1
+
Installing pymodbus-2.5.3rc1-py2.py3-none-any.whl to /usr/lib/python3.5/site-packages
−
WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv
+
writing requirements to /usr/lib/python3.5/site-packages/pymodbus-2.5.3rc1-py3.5.egg/EGG-INFO/requires.txt
−
root@desk-mx6ul-lynx:~#
+
Adding pymodbus 2.5.3rc1 to easy-install.pth file
−
</pre>
+
Installing pymodbus.server script to /usr/bin
 +
Installing pymodbus.console script to /usr/bin
 +
 
 +
Installed /usr/lib/python3.5/site-packages/pymodbus-2.5.3rc1-py3.5.egg
 +
Processing dependencies for pymodbus
 +
Searching for six>=1.15.0
 +
Reading https://pypi.python.org/simple/six/
 +
Downloading https://files.pythonhosted.org/packages/d9/5a/e7c31adbe875f2abbb91bd84cf2dc52d792b5a01506781dbcf25c91daf11/six-1.16.0-py2.py3-none-any.whl#sha256=8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254
 +
Best match: six 1.16.0
 +
Processing six-1.16.0-py2.py3-none-any.whl
 +
Installing six-1.16.0-py2.py3-none-any.whl to /usr/lib/python3.5/site-packages
 +
Adding six 1.16.0 to easy-install.pth file
 +
 
 +
Installed /usr/lib/python3.5/site-packages/six-1.16.0-py3.5.egg
 +
Finished processing dependencies for pymodbus
 +
root@desk-mx6ul-axelulite:~# easy3_install requests
 +
Searching for requests
 +
Reading https://pypi.python.org/simple/requests/
 +
Downloading https://files.pythonhosted.org/packages/92/96/144f70b972a9c0eabbd4391ef93ccd49d0f2747f4f6a2a2738e99e5adc65/requests-2.26.0-py2.py3-none-any.whl#sha256=6c1246513ecd5ecd4528a0906f910e8f0f9c6b8ec72030dc9fd154dc1a6efd24
 +
Best match: requests 2.26.0
 +
Processing requests-2.26.0-py2.py3-none-any.whl
 +
Installing requests-2.26.0-py2.py3-none-any.whl to /usr/lib/python3.5/site-packages
 +
writing requirements to /usr/lib/python3.5/site-packages/requests-2.26.0-py3.5.egg/EGG-INFO/requires.txt
 +
Adding requests 2.26.0 to easy-install.pth file
 +
 
 +
Installed /usr/lib/python3.5/site-packages/requests-2.26.0-py3.5.egg
 +
Processing dependencies for requests
 +
Searching for urllib3<1.27,>=1.21.1
 +
Reading https://pypi.python.org/simple/urllib3/
 +
Downloading https://files.pythonhosted.org/packages/af/f4/524415c0744552cce7d8bf3669af78e8a069514405ea4fcbd0cc44733744/urllib3-1.26.7-py2.py3-none-any.whl#sha256=c4fdf4019605b6e5423637e01bc9fe4daef873709a7973e195ceba0a62bbc844
 +
Best match: urllib3 1.26.7
 +
Processing urllib3-1.26.7-py2.py3-none-any.whl
 +
Installing urllib3-1.26.7-py2.py3-none-any.whl to /usr/lib/python3.5/site-packages
 +
writing requirements to /usr/lib/python3.5/site-packages/urllib3-1.26.7-py3.5.egg/EGG-INFO/requires.txt
 +
Adding urllib3 1.26.7 to easy-install.pth file
 +
 
 +
Installed /usr/lib/python3.5/site-packages/urllib3-1.26.7-py3.5.egg
 +
Searching for charset-normalizer~=2.0.0
 +
Reading https://pypi.python.org/simple/charset-normalizer/
 +
Downloading https://files.pythonhosted.org/packages/3f/65/69e6754102dcd018a0f29e4db673372eb323ee504431125ab6c9109cb21c/charset_normalizer-2.0.6-py3-none-any.whl#sha256=5d209c0a931f215cee683b6445e2d77677e7e75e159f78def0db09d68fafcaa6
 +
Best match: charset-normalizer 2.0.6
 +
Processing charset_normalizer-2.0.6-py3-none-any.whl
 +
Installing charset_normalizer-2.0.6-py3-none-any.whl to /usr/lib/python3.5/site-packages
 +
writing requirements to /usr/lib/python3.5/site-packages/charset_normalizer-2.0.6-py3.5.egg/EGG-INFO/requires.txt
 +
Adding charset-normalizer 2.0.6 to easy-install.pth file
 +
Installing normalizer script to /usr/bin
  
−
After the installation, <code>pip3</code> is the latest version available for '''Python3 3.9.4''':
+
Installed /usr/lib/python3.5/site-packages/charset_normalizer-2.0.6-py3.5.egg
 +
Searching for certifi>=2017.4.17
 +
Reading https://pypi.python.org/simple/certifi/
 +
Downloading https://files.pythonhosted.org/packages/05/1b/0a0dece0e8aa492a6ec9e4ad2fe366b511558cdc73fd3abc82ba7348e875/certifi-2021.5.30-py2.py3-none-any.whl#sha256=50b1e4f8446b06f41be7dd6338db18e0990601dce795c2b1686458aa7e8fa7d8
 +
Best match: certifi 2021.5.30
 +
Processing certifi-2021.5.30-py2.py3-none-any.whl
 +
Installing certifi-2021.5.30-py2.py3-none-any.whl to /usr/lib/python3.5/site-packages
 +
Adding certifi 2021.5.30 to easy-install.pth file
  
−
<pre class="board-terminal">
+
Installed /usr/lib/python3.5/site-packages/certifi-2021.5.30-py3.5.egg
−
root@desk-mx6ul-lynx:~# pip3 --version
+
Finished processing dependencies for requests
−
pip 21.3.1 from /usr/lib/python3.9/site-packages/pip (python 3.9)
+
root@desk-mx6ul-axelulite:~# easy3_install schema
−
root@desk-mx6ul-lynx:~#
+
Searching for schema
−
</pre>
+
Reading https://pypi.python.org/simple/schema/
 +
Downloading https://files.pythonhosted.org/packages/c7/64/497632c9dc3c1bc94a92d9cafdc5cbd21d011bb651952765195739129a49/schema-0.7.4-py2.py3-none-any.whl#sha256=cf97e4cd27e203ab6bb35968532de1ed8991bce542a646f0ff1d643629a4945d
 +
Best match: schema 0.7.4
 +
Processing schema-0.7.4-py2.py3-none-any.whl
 +
Installing schema-0.7.4-py2.py3-none-any.whl to /usr/lib/python3.5/site-packages
 +
writing requirements to /usr/lib/python3.5/site-packages/schema-0.7.4-py3.5.egg/EGG-INFO/requires.txt
 +
Adding schema 0.7.4 to easy-install.pth file
  
−
== Virtual environments ==
+
Installed /usr/lib/python3.5/site-packages/schema-0.7.4-py3.5.egg
−
As explained on [https://docs.python.org/3/tutorial/venv.html python3 12. Virtual Environments and Packages] tutorial it is better to ''"create a virtual environment, a self-contained directory tree that contains a Python installation for a particular version of Python, plus a number of additional packages"''
+
Processing dependencies for schema
 +
Searching for contextlib2>=0.5.5
 +
Reading https://pypi.python.org/simple/contextlib2/
 +
Downloading https://files.pythonhosted.org/packages/76/56/6d6872f79d14c0cb02f1646cbb4592eef935857c0951a105874b7b62a0c3/contextlib2-21.6.0-py2.py3-none-any.whl#sha256=3fbdb64466afd23abaf6c977627b75b6139a5a3e8ce38405c5b413aed7a0471f
 +
Best match: contextlib2 21.6.0
 +
Processing contextlib2-21.6.0-py2.py3-none-any.whl
 +
Installing contextlib2-21.6.0-py2.py3-none-any.whl to /usr/lib/python3.5/site-packages
 +
Adding contextlib2 21.6.0 to easy-install.pth file
  
−
This avoids the problem related to Applications that sometimes need a specific version of a library. In this way it is possible to install the required packages (with their specific version required) only in this ''virtual environment'' (which may differ from the ''root'' installation).
+
Installed /usr/lib/python3.5/site-packages/contextlib2-21.6.0-py3.5.egg
 +
Finished processing dependencies for schema
 +
root@desk-mx6ul-axelulite:~# easy3_install ssdp
 +
Searching for ssdp
 +
Reading https://pypi.python.org/simple/ssdp/
 +
Downloading https://files.pythonhosted.org/packages/1d/04/d761ea63c8cb9e0e8a37cc63df9ec39c8c6a0f77363d131035b694758a5d/ssdp-1.1.0-py2.py3-none-any.whl#sha256=dc91a844e54ba6b1a2f3be4d9a52302027f71719c5eb2c0e6fbd77e67e7343ad
 +
Best match: ssdp 1.1.0
 +
Processing ssdp-1.1.0-py2.py3-none-any.whl
 +
Installing ssdp-1.1.0-py2.py3-none-any.whl to /usr/lib/python3.5/site-packages
 +
Adding ssdp 1.1.0 to easy-install.pth file
  
−
* for example, create the <code>virtual environment</code> named '''desk'''
+
Installed /usr/lib/python3.5/site-packages/ssdp-1.1.0-py3.5.egg
−
<pre class="board-terminal">
+
Processing dependencies for ssdp
−
root@desk-mx6ul-lynx:~# python3 -m venv desk-env
+
Finished processing dependencies for ssdp
−
root@desk-mx6ul-lynx:~# which pip3
+
root@desk-mx6ul-axelulite:~#
−
/usr/bin/pip3
 
−
root@desk-mx6ul-lynx:~#  
 
 
</pre>
 
</pre>
−
* activate the <code>virtual environment</code>
+
 
 +
Then, add some useful IP packages like '''nmap''' or '''[https://scapy.readthedocs.io/en/latest/ scapy]''' (network packet manipulation):
 
<pre class="board-terminal">
 
<pre class="board-terminal">
−
root@desk-mx6ul-lynx:~# source desk-env/bin/activate
+
root@desk-mx6ul-axelulite:~# easy3_install nmap
 +
Searching for nmap
 +
Reading https://pypi.python.org/simple/nmap/
 +
Downloading https://files.pythonhosted.org/packages/f8/6f/6813025bd575ebc771189afaab7c405fdf3f1febaa197525d5aa6fd88ac5/nmap-0.0.1-py3-none-any.whl#sha256=158de16af02043e1a2015662ad1710dfb46dadd2bea8e9d90ba16b78b6650098
 +
Best match: nmap 0.0.1
 +
Processing nmap-0.0.1-py3-none-any.whl
 +
Installing nmap-0.0.1-py3-none-any.whl to /usr/lib/python3.5/site-packages
 +
Adding nmap 0.0.1 to easy-install.pth file
 +
 
 +
Installed /usr/lib/python3.5/site-packages/nmap-0.0.1-py3.5.egg
 +
Processing dependencies for nmap
 +
Finished processing dependencies for nmap
 +
root@desk-mx6ul-axelulite:~# easy3_install scapy
 +
Searching for scapy
 +
Reading https://pypi.python.org/simple/scapy/
 +
Downloading https://files.pythonhosted.org/packages/85/47/c919432ca258f354bb2c1e645623f891603f185bfc7563d4a21f6432e7ed/scapy-2.4.5.tar.gz#sha256=bc707e3604784496b6665a9e5b2a69c36cc9fb032af4864b29051531b24c8593
 +
Best match: scapy 2.4.5
 +
Processing scapy-2.4.5.tar.gz
 +
Writing /tmp/easy_install-vsqq0ans/scapy-2.4.5/setup.cfg
 +
Running scapy-2.4.5/setup.py -q bdist_egg --dist-dir /tmp/easy_install-vsqq0ans/scapy-2.4.5/egg-dist-tmp-nauxdhas
 +
/usr/lib/python3.5/distutils/dist.py:261: UserWarning: Unknown distribution option: 'long_description_content_type'
 +
  warnings.warn(msg)
 +
creating /usr/lib/python3.5/site-packages/scapy-2.4.5-py3.5.egg
 +
Extracting scapy-2.4.5-py3.5.egg to /usr/lib/python3.5/site-packages
 +
Adding scapy 2.4.5 to easy-install.pth file
 +
Installing scapy script to /usr/bin
 +
Installing UTscapy script to /usr/bin
 +
 
 +
Installed /usr/lib/python3.5/site-packages/scapy-2.4.5-py3.5.egg
 +
Processing dependencies for scapy
 +
Finished processing dependencies for scapy
 +
root@desk-mx6ul-axelulite:~#
 
</pre>
 
</pre>
−
* check and update ''pip3'' in the the <code>virtual environment</code>
+
 
 +
On top of that, some web packages are very useful for creating web application and remotely control/get information from the gateway: '''[https://bottlepy.org/docs/dev/ bottle]''' (lightweight WSGI micro web-framework), '''[https://pypi.org/project/fastapi/ fastapi]''' (high-performance web framework):
 +
 
 
<pre class="board-terminal">
 
<pre class="board-terminal">
−
(desk-env) root@desk-mx6ul-lynx:~# which pip3
+
root@desk-mx6ul-axelulite:~# easy3_install bottle
−
/home/root/desk-env/bin/pip3
+
Searching for bottle
−
(desk-env) root@desk-mx6ul-lynx:~# python3 -m pip install --upgrade pip
+
Reading https://pypi.python.org/simple/bottle/
−
Collecting pip
+
Downloading https://files.pythonhosted.org/packages/bf/44/aeafdd6ca05a8e1c3f91eeeb272a202d5cb1b3b23730a5ca686a81c48d24/bottle-0.12.19-py3-none-any.whl#sha256=f6b8a34fe9aa406f9813c02990db72ca69ce6a158b5b156d2c41f345016a723d
−
  Using cached pip-21.3.1-py3-none-any.whl (1.7 MB)
+
Best match: bottle 0.12.19
−
Installing collected packages: pip
+
Processing bottle-0.12.19-py3-none-any.whl
−
  Attempting uninstall: pip
+
Installing bottle-0.12.19-py3-none-any.whl to /usr/lib/python3.5/site-packages
−
    Found existing installation: pip 20.2.3
+
Adding bottle 0.12.19 to easy-install.pth file
−
    Uninstalling pip-20.2.3:
+
Installing bottle.py script to /usr/bin
−
      Successfully uninstalled pip-20.2.3
+
 
−
Successfully installed pip-21.3.1
+
Installed /usr/lib/python3.5/site-packages/bottle-0.12.19-py3.5.egg
−
(desk-env) root@desk-mx6ul-lynx:~# pip3 --version
+
Processing dependencies for bottle
−
pip 21.3.1 from /home/root/desk-env/lib/python3.9/site-packages/pip (python 3.9)
+
Finished processing dependencies for bottle
−
(desk-env) root@desk-mx6ul-lynx:~#
+
root@desk-mx6ul-axelulite:~# easy3_install fastapi
 +
Searching for fastapi
 +
Reading https://pypi.python.org/simple/fastapi/
 +
Downloading https://files.pythonhosted.org/packages/92/a8/10d8a171afa66e6e8a5cfe82771d11c4c84a2a874c19c0b55c7099001fac/fastapi-0.68.2-py3-none-any.whl#sha256=36bcdd3dbea87c586061005e4a40b9bd0145afd766655b4e0ec1d8870b32555c
 +
Best match: fastapi 0.68.2
 +
Processing fastapi-0.68.2-py3-none-any.whl
 +
Installing fastapi-0.68.2-py3-none-any.whl to /usr/lib/python3.5/site-packages
 +
writing requirements to /usr/lib/python3.5/site-packages/fastapi-0.68.2-py3.5.egg/EGG-INFO/requires.txt
 +
Adding fastapi 0.68.2 to easy-install.pth file
 +
 
 +
Installed /usr/lib/python3.5/site-packages/fastapi-0.68.2-py3.5.egg
 +
Processing dependencies for fastapi
 +
Searching for starlette==0.14.2
 +
Reading https://pypi.python.org/simple/starlette/
 +
Downloading https://files.pythonhosted.org/packages/15/34/db1890f442a1cd3a2c761f4109a0eb4e63503218d70a8c8e97faa09a5500/starlette-0.14.2-py3-none-any.whl#sha256=3c8e48e52736b3161e34c9f0e8153b4f32ec5d8995a3ee1d59410d92f75162ed
 +
Best match: starlette 0.14.2
 +
Processing starlette-0.14.2-py3-none-any.whl
 +
Installing starlette-0.14.2-py3-none-any.whl to /usr/lib/python3.5/site-packages
 +
writing requirements to /usr/lib/python3.5/site-packages/starlette-0.14.2-py3.5.egg/EGG-INFO/requires.txt
 +
Adding starlette 0.14.2 to easy-install.pth file
 +
 
 +
Installed /usr/lib/python3.5/site-packages/starlette-0.14.2-py3.5.egg
 +
Searching for pydantic!=1.7,!=1.7.1,!=1.7.2,!=1.7.3,!=1.8,!=1.8.1,<2.0.0,>=1.6.2
 +
Reading https://pypi.python.org/simple/pydantic/
 +
Downloading https://files.pythonhosted.org/packages/ff/74/54e030641601112309f6d2af620774e9080f99c7a15742fc6a0b170c4076/pydantic-1.8.2-py3-none-any.whl#sha256=fec866a0b59f372b7e776f2d7308511784dace622e0992a0b59ea3ccee0ae833
 +
Best match: pydantic 1.8.2
 +
Processing pydantic-1.8.2-py3-none-any.whl
 +
Installing pydantic-1.8.2-py3-none-any.whl to /usr/lib/python3.5/site-packages
 +
writing requirements to /usr/lib/python3.5/site-packages/pydantic-1.8.2-py3.5.egg/EGG-INFO/requires.txt
 +
Adding pydantic 1.8.2 to easy-install.pth file
 +
 
 +
Installed /usr/lib/python3.5/site-packages/pydantic-1.8.2-py3.5.egg
 +
Searching for typing-extensions>=3.7.4.3
 +
Reading https://pypi.python.org/simple/typing-extensions/
 +
Downloading https://files.pythonhosted.org/packages/74/60/18783336cc7fcdd95dae91d73477830aa53f5d3181ae4fe20491d7fc3199/typing_extensions-3.10.0.2-py3-none-any.whl#sha256=f1d25edafde516b146ecd0613dabcc61409817af4766fbbcfb8d1ad4ec441a34
 +
Best match: typing-extensions 3.10.0.2
 +
Processing typing_extensions-3.10.0.2-py3-none-any.whl
 +
Installing typing_extensions-3.10.0.2-py3-none-any.whl to /usr/lib/python3.5/site-packages
 +
Adding typing-extensions 3.10.0.2 to easy-install.pth file
 +
 
 +
Installed /usr/lib/python3.5/site-packages/typing_extensions-3.10.0.2-py3.5.egg
 +
Finished processing dependencies for fastapi
 
</pre>
 
</pre>
  
−
* <code>setuptools</code> can be upgraded too:
+
and finally an MQTT client like [http://www.eclipse.org/paho/ Eclipse paho MQTT] is installed too:
  
 
<pre class="board-terminal">
 
<pre class="board-terminal">
−
(desk-env) root@desk-mx6ul-lynx:~# pip3 install --upgrade setuptools
+
root@desk-mx6ul-axelulite:~# easy3_install paho-mqtt
−
Requirement already satisfied: setuptools in ./desk-env/lib/python3.9/site-packages (49.2.1)
+
Searching for paho-mqtt
−
Collecting setuptools
+
Reading https://pypi.python.org/simple/paho-mqtt/
−
  Using cached setuptools-60.5.0-py3-none-any.whl (958 kB)
+
Downloading https://files.pythonhosted.org/packages/32/d3/6dcb8fd14746fcde6a556f932b5de8bea8fedcb85b3a092e0e986372c0e7/paho-mqtt-1.5.1.tar.gz#sha256=9feb068e822be7b3a116324e01fb6028eb1d66412bf98595ae72698965cb1cae
−
Installing collected packages: setuptools
+
Best match: paho-mqtt 1.5.1
−
  Attempting uninstall: setuptools
+
Processing paho-mqtt-1.5.1.tar.gz
−
    Found existing installation: setuptools 49.2.1
+
Writing /tmp/easy_install-vkarrpqi/paho-mqtt-1.5.1/setup.cfg
−
    Uninstalling setuptools-49.2.1:
+
Running paho-mqtt-1.5.1/setup.py -q bdist_egg --dist-dir /tmp/easy_install-vkarrpqi/paho-mqtt-1.5.1/egg-dist-tmp-tt8lku70
−
      Successfully uninstalled setuptools-49.2.1
+
creating /usr/lib/python3.5/site-packages/paho_mqtt-1.5.1-py3.5.egg
−
  WARNING: Value for scheme.platlib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
+
Extracting paho_mqtt-1.5.1-py3.5.egg to /usr/lib/python3.5/site-packages
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
+
Adding paho-mqtt 1.5.1 to easy-install.pth file
−
  sysconfig: /usr/lib/python3.9/site-packages
+
 
−
  WARNING: Value for scheme.purelib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
+
Installed /usr/lib/python3.5/site-packages/paho_mqtt-1.5.1-py3.5.egg
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
+
Processing dependencies for paho-mqtt
−
  sysconfig: /usr/lib/python3.9/site-packages
+
Finished processing dependencies for paho-mqtt
−
  WARNING: Additional context:
+
root@desk-mx6ul-axelulite:~#
−
  user = False
 
−
  home = None
 
−
  root = None
 
−
  prefix = None
 
−
Successfully installed setuptools-60.5.0
 
−
(desk-env) root@desk-mx6ul-lynx:~#  
 
 
</pre>
 
</pre>
  
−
Afterword, the [https://pypi.org/project/wheel/ wheel] package is worth to be installed for further package installation:
+
=== DNF ===
 +
In case of some troubles (which can happens using <code>easy_install</code> or <code>pip</code>), other packages can be directly installed using <code>dnf</code> from the already built ''rpm'' packages built with Yocto:
 +
 
 +
For example, for installing '''[https://flask.palletsprojects.com/en/2.0.x/ flask]''' or '''ujson''' it is possible to use <code>dnf install <rpm-package></code>:
 +
 
 
<pre class="board-terminal">
 
<pre class="board-terminal">
−
(desk-env) root@desk-mx6ul-lynx:~# pip3 install wheel
+
root@desk-mx6ul-axelulite:~# dnf install python3-flask
−
Collecting wheel
+
Last metadata expiration check: 0:13:01 ago on Wed Oct  6 08:39:56 2021.
−
  Using cached wheel-0.37.1-py2.py3-none-any.whl (35 kB)
+
Dependencies resolved.
−
Installing collected packages: wheel
+
================================================================================
−
  WARNING: Value for scheme.platlib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
+
Package                  Arch              Version      Repository    Size
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
+
================================================================================
−
   sysconfig: /usr/lib/python3.9/site-packages
+
Installing:
−
   WARNING: Value for scheme.purelib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
+
python3-flask            cortexa7hf_neon    0.12.2-r0    cortexa7hf    110 k
−
   distutils: /home/root/desk-env/lib/python3.9/site-packages
+
Installing dependencies:
−
   sysconfig: /usr/lib/python3.9/site-packages
+
python3-click            cortexa7hf_neon    6.7-r0        cortexa7hf    110 k
−
   WARNING: Additional context:
+
python3-itsdangerous      cortexa7hf_neon    0.24-r0      cortexa7hf    23 k
−
   user = False
+
python3-jinja2            cortexa7hf_neon    2.10-r0      cortexa7hf    187 k
−
   home = None
+
python3-markupsafe        cortexa7hf_neon    1.0-r0        cortexa7hf    25 k
−
   root = None
+
python3-simplejson        cortexa7hf_neon    3.13.2-r0    cortexa7hf    50 k
−
   prefix = None
+
python3-werkzeug          cortexa7hf_neon    0.14.1-r0    cortexa7hf    375 k
−
Successfully installed wheel-0.37.1
+
python3-werkzeug-tests    cortexa7hf_neon    0.14.1-r0    cortexa7hf    32 k
−
(desk-env) root@desk-mx6ul-lynx:~#
+
 
−
</pre>
+
Transaction Summary
 +
================================================================================
 +
Install  8 Packages
 +
 
 +
Total download size: 912 k
 +
Installed size: 3.7 M
 +
Is this ok [y/N]: y
 +
Downloading Packages:
 +
(1/8): python3-itsdangerous-0.24-r0.cortexa7hf_ 128 kB/s |  23 kB    00:00
 +
(2/8): python3-flask-0.12.2-r0.cortexa7hf_neon. 344 kB/s | 110 kB    00:00
 +
(3/8): python3-click-6.7-r0.cortexa7hf_neon.rpm 329 kB/s | 110 kB    00:00
 +
(4/8): python3-jinja2-2.10-r0.cortexa7hf_neon.r 508 kB/s | 187 kB    00:00
 +
(5/8): python3-werkzeug-tests-0.14.1-r0.cortexa 137 kB/s |  32 kB    00:00
 +
(6/8): python3-markupsafe-1.0-r0.cortexa7hf_neo 318 kB/s |  25 kB    00:00
 +
(7/8): python3-simplejson-3.13.2-r0.cortexa7hf_ 220 kB/s |  50 kB    00:00
 +
(8/8): python3-werkzeug-0.14.1-r0.cortexa7hf_ne 684 kB/s | 375 kB    00:00
 +
--------------------------------------------------------------------------------
 +
Total                                          979 kB/s | 912 kB    00:00
 +
Running transaction check
 +
Transaction check succeeded.
 +
Running transaction test
 +
Transaction test succeeded.
 +
Running transaction
 +
   Preparing        :                                                       1/1
 +
  Installing      : python3-werkzeug-0.14.1-r0.cortexa7hf_neon            1/8
 +
  Installing      : python3-werkzeug-tests-0.14.1-r0.cortexa7hf_neon      2/8
 +
  Installing      : python3-markupsafe-1.0-r0.cortexa7hf_neon              3/8
 +
  Installing      : python3-jinja2-2.10-r0.cortexa7hf_neon                4/8
 +
   Installing      : python3-simplejson-3.13.2-r0.cortexa7hf_neon          5/8
 +
  Installing      : python3-itsdangerous-0.24-r0.cortexa7hf_neon          6/8
 +
  Installing      : python3-click-6.7-r0.cortexa7hf_neon                  7/8
 +
  Installing      : python3-flask-0.12.2-r0.cortexa7hf_neon                8/8
 +
  Verifying        : python3-flask-0.12.2-r0.cortexa7hf_neon                1/8
 +
  Verifying        : python3-click-6.7-r0.cortexa7hf_neon                  2/8
 +
  Verifying        : python3-itsdangerous-0.24-r0.cortexa7hf_neon          3/8
 +
   Verifying        : python3-jinja2-2.10-r0.cortexa7hf_neon                4/8
 +
  Verifying        : python3-werkzeug-0.14.1-r0.cortexa7hf_neon            5/8
 +
  Verifying        : python3-werkzeug-tests-0.14.1-r0.cortexa7hf_neon      6/8
 +
  Verifying        : python3-simplejson-3.13.2-r0.cortexa7hf_neon          7/8
 +
   Verifying        : python3-markupsafe-1.0-r0.cortexa7hf_neon              8/8
 +
 
 +
Installed:
 +
  python3-flask.cortexa7hf_neon 0.12.2-r0
 +
   python3-click.cortexa7hf_neon 6.7-r0
 +
   python3-itsdangerous.cortexa7hf_neon 0.24-r0
 +
   python3-jinja2.cortexa7hf_neon 2.10-r0
 +
   python3-markupsafe.cortexa7hf_neon 1.0-r0
 +
   python3-simplejson.cortexa7hf_neon 3.13.2-r0
 +
  python3-werkzeug.cortexa7hf_neon 0.14.1-r0
 +
  python3-werkzeug-tests.cortexa7hf_neon 0.14.1-r0
 +
 
 +
Complete!
 +
root@desk-mx6ul-axelulite:~# dnf install python3-ujson
 +
Last metadata expiration check: 1:31:56 ago on Wed Oct  6 08:39:56 2021.
 +
Dependencies resolved.
 +
================================================================================
 +
Package            Arch                  Version      Repository        Size
 +
================================================================================
 +
Installing:
 +
python3-ujson      cortexa7hf_neon      1.35-r0      cortexa7hf        24 k
 +
 
 +
Transaction Summary
 +
================================================================================
 +
Install  1 Package
  
−
=== pip package installation===
+
Total download size: 24 k
−
For the purposes of this Application Note, <code>pip3</code> has been used to install some python packages typically used in an Industrial Gateway equipment
+
Installed size: 59 k
 +
Is this ok [y/N]: y
 +
Downloading Packages:
 +
python3-ujson-1.35-r0.cortexa7hf_neon.rpm        22 kB/s |  24 kB    00:01
 +
--------------------------------------------------------------------------------
 +
Total                                            21 kB/s |  24 kB    00:01
 +
Running transaction check
 +
Transaction check succeeded.
 +
Running transaction test
 +
Transaction test succeeded.
 +
Running transaction
 +
  Preparing        :                                                        1/1
 +
  Installing      : python3-ujson-1.35-r0.cortexa7hf_neon                  1/1
 +
  Verifying        : python3-ujson-1.35-r0.cortexa7hf_neon                  1/1
  
−
In this example, the following packages are installed '''pyserial''' and '''pymodbus''' (for bus communications), '''[https://flask.palletsprojects.com/en/2.0.x/ flask]''', '''[https://fastapi.tiangolo.com/ fastapi]''' (web framework), '''[https://bottlepy.org/docs/dev/ bottle]''' (lightweight WSGI micro web-framework), '''[https://docs.python-requests.org/en/latest/ requests]''' (HTTP library), '''schema''', '''ssdp''', '''[https://scapy.readthedocs.io/en/latest/ scapy]''' (network packet manipulation), '''nmap''', '''[https://pypi.org/project/ujson/ ujson]''' (JSON framework):
+
Installed:
 +
  python3-ujson.cortexa7hf_neon 1.35-r0
  
−
<pre class="board-terminal">
+
Complete!
−
(desk-env) root@desk-mx6ul-lynx:~# pip3 install pyserial
+
root@desk-mx6ul-axelulite:~#
−
Collecting pyserial
 
−
  Downloading pyserial-3.5-py2.py3-none-any.whl (90 kB)
 
−
    Collecting fastapi
 
−
  Downloading fastapi-0.72.0-py3-none-any.whl (52 kB)
 
−
    |████████████████████████████████| 52 kB 77 kB/s
 
−
Collecting pydantic!=1.7,!=1.7.1,!=1.7.2,!=1.7.3,!=1.8,!=1.8.1,<2.0.0,>=1.6.2
 
−
  Downloading pydantic-1.9.0-py3-none-any.whl (140 kB)
 
−
    |████████████████████████████████| 140 kB 2.1 MB/s
 
−
Collecting starlette==0.17.1
 
−
  Downloading starlette-0.17.1-py3-none-any.whl (58 kB)
 
−
    |████████████████████████████████| 58 kB 619 kB/s
 
−
Collecting anyio<4,>=3.0.0
 
−
  Downloading anyio-3.5.0-py3-none-any.whl (79 kB)
 
−
    |████████████████████████████████| 79 kB 797 kB/s
 
−
Collecting typing-extensions>=3.7.4.3
 
−
  Downloading typing_extensions-4.0.1-py3-none-any.whl (22 kB)
 
−
Collecting sniffio>=1.1
 
−
  Downloading sniffio-1.2.0-py3-none-any.whl (10 kB)
 
−
Collecting idna>=2.8
 
−
  Downloading idna-3.3-py3-none-any.whl (61 kB)
 
−
    |████████████████████████████████| 90 kB 780 kB/s           
 
−
Installing collected packages: pyserial
 
−
  WARNING: Value for scheme.platlib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Value for scheme.purelib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Additional context:
 
−
  user = False
 
−
  home = None
 
−
  root = None
 
−
  prefix = None
 
−
Successfully installed pyserial-3.5
 
−
(desk-env) root@desk-mx6ul-lynx:~# pip3 install pymodbus
 
−
Collecting pymodbus
 
−
  Downloading pymodbus-2.5.3-py2.py3-none-any.whl (154 kB)
 
−
    |████████████████████████████████| 154 kB 1.5 MB/s           
 
−
Collecting six>=1.15.0
 
−
  Downloading six-1.16.0-py2.py3-none-any.whl (11 kB)
 
−
Requirement already satisfied: pyserial>=3.4 in ./desk-env/lib/python3.9/site-packages (from pymodbus) (3.5)
 
−
Installing collected packages: six, pymodbus
 
−
  WARNING: Value for scheme.platlib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Value for scheme.purelib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Additional context:
 
−
  user = False
 
−
  home = None
 
−
  root = None
 
−
  prefix = None
 
−
Successfully installed pymodbus-2.5.3 six-1.16.0
 
−
(desk-env) root@desk-mx6ul-lynx:~# pip3 install flask
 
−
Collecting flask
 
−
  Downloading Flask-2.0.2-py3-none-any.whl (95 kB)
 
−
    |████████████████████████████████| 95 kB 422 kB/s
 
−
Collecting Werkzeug>=2.0
 
−
  Downloading Werkzeug-2.0.2-py3-none-any.whl (288 kB)
 
−
    |████████████████████████████████| 288 kB 2.1 MB/s
 
−
Collecting itsdangerous>=2.0
 
−
  Downloading itsdangerous-2.0.1-py3-none-any.whl (18 kB)
 
−
Collecting click>=7.1.2
 
−
  Downloading click-8.0.3-py3-none-any.whl (97 kB)
 
−
    |████████████████████████████████| 97 kB 226 kB/s
 
−
Collecting Jinja2>=3.0
 
−
  Downloading Jinja2-3.0.3-py3-none-any.whl (133 kB)
 
−
    |████████████████████████████████| 133 kB 2.1 MB/s
 
−
Collecting MarkupSafe>=2.0
 
−
  Downloading MarkupSafe-2.0.1.tar.gz (18 kB)
 
−
  Preparing metadata (setup.py) ... done
 
−
Building wheels for collected packages: MarkupSafe
 
−
  Building wheel for MarkupSafe (setup.py) ... done
 
−
  Created wheel for MarkupSafe: filename=MarkupSafe-2.0.1-cp39-cp39-linux_armv7l.whl size=25720 sha256=4fa273af41ed51d0614beb76603162148fd15472aa0eb8c1c28a9c18ed137031
 
−
  Stored in directory: /home/root/.cache/pip/wheels/9f/6d/c8/1f59b07cf85ae842908006ec28f4477f7e4578df72c3eb0e46
 
−
Successfully built MarkupSafe
 
−
Installing collected packages: MarkupSafe, Werkzeug, Jinja2, itsdangerous, click, flask
 
−
  WARNING: Value for scheme.platlib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Value for scheme.purelib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Additional context:
 
−
  user = False
 
−
  home = None
 
−
  root = None
 
−
  prefix = None
 
−
Successfully installed Jinja2-3.0.3 MarkupSafe-2.0.1 Werkzeug-2.0.2 click-8.0.3 flask-2.0.2 itsdangerous-2.0.1
 
−
(desk-env) root@desk-mx6ul-lynx:~# pip3 install fastapi
 
−
Collecting fastapi
 
−
  Downloading fastapi-0.72.0-py3-none-any.whl (52 kB)
 
−
    |████████████████████████████████| 52 kB 77 kB/s
 
−
Collecting pydantic!=1.7,!=1.7.1,!=1.7.2,!=1.7.3,!=1.8,!=1.8.1,<2.0.0,>=1.6.2
 
−
  Downloading pydantic-1.9.0-py3-none-any.whl (140 kB)
 
−
    |████████████████████████████████| 140 kB 2.1 MB/s
 
−
Collecting starlette==0.17.1
 
−
  Downloading starlette-0.17.1-py3-none-any.whl (58 kB)
 
−
    |████████████████████████████████| 58 kB 619 kB/s
 
−
Collecting anyio<4,>=3.0.0
 
−
  Downloading anyio-3.5.0-py3-none-any.whl (79 kB)
 
−
    |████████████████████████████████| 79 kB 797 kB/s
 
−
Collecting typing-extensions>=3.7.4.3
 
−
  Downloading typing_extensions-4.0.1-py3-none-any.whl (22 kB)
 
−
Collecting sniffio>=1.1
 
−
  Downloading sniffio-1.2.0-py3-none-any.whl (10 kB)
 
−
Collecting idna>=2.8
 
−
  Downloading idna-3.3-py3-none-any.whl (61 kB)
 
−
    |████████████████████████████████| 61 kB 770 kB/s
 
−
Installing collected packages: sniffio, idna, typing-extensions, anyio, starlette, pydantic, fastapi
 
−
  WARNING: Value for scheme.platlib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Value for scheme.purelib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Additional context:
 
−
  user = False
 
−
  home = None
 
−
  root = None
 
−
  prefix = None
 
−
Successfully installed anyio-3.5.0 fastapi-0.72.0 idna-3.3 pydantic-1.9.0 sniffio-1.2.0 starlette-0.17.1 typing-extensions-4.0.1
 
−
(desk-env) root@desk-mx6ul-lynx:~# pip3 install bottle
 
−
Collecting bottle
 
−
  Downloading bottle-0.12.19-py3-none-any.whl (89 kB)
 
−
    |████████████████████████████████| 89 kB 724 kB/s
 
−
Installing collected packages: bottle
 
−
  WARNING: Value for scheme.platlib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Value for scheme.purelib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Additional context:
 
−
  user = False
 
−
  home = None
 
−
  root = None
 
−
  prefix = None
 
−
Successfully installed bottle-0.12.19
 
−
(desk-env) root@desk-mx6ul-lynx:~# pip3 install requests
 
−
Collecting requests
 
−
  Downloading requests-2.27.1-py2.py3-none-any.whl (63 kB)
 
−
    |████████████████████████████████| 63 kB 141 kB/s
 
−
Requirement already satisfied: idna<4,>=2.5 in ./desk-env/lib/python3.9/site-packages (from requests) (3.3)
 
−
Collecting charset-normalizer~=2.0.0
 
−
  Downloading charset_normalizer-2.0.10-py3-none-any.whl (39 kB)
 
−
Collecting certifi>=2017.4.17
 
−
  Downloading certifi-2021.10.8-py2.py3-none-any.whl (149 kB)
 
−
    |████████████████████████████████| 149 kB 2.2 MB/s
 
−
Collecting urllib3<1.27,>=1.21.1
 
−
  Downloading urllib3-1.26.8-py2.py3-none-any.whl (138 kB)
 
−
    |████████████████████████████████| 138 kB 2.2 MB/s
 
−
Installing collected packages: urllib3, charset-normalizer, certifi, requests
 
−
  WARNING: Value for scheme.platlib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Value for scheme.purelib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Additional context:
 
−
  user = False
 
−
  home = None
 
−
  root = None
 
−
  prefix = None
 
−
Successfully installed certifi-2021.10.8 charset-normalizer-2.0.10 requests-2.27.1 urllib3-1.26.8
 
−
(desk-env) root@desk-mx6ul-lynx:~# pip3 install schema
 
−
Collecting schema
 
−
  Downloading schema-0.7.5-py2.py3-none-any.whl (17 kB)
 
−
Collecting contextlib2>=0.5.5
 
−
  Downloading contextlib2-21.6.0-py2.py3-none-any.whl (13 kB)
 
−
Installing collected packages: contextlib2, schema
 
−
  WARNING: Value for scheme.platlib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Value for scheme.purelib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Additional context:
 
−
  user = False
 
−
  home = None
 
−
  root = None
 
−
  prefix = None
 
−
Successfully installed contextlib2-21.6.0 schema-0.7.5
 
−
(desk-env) root@desk-mx6ul-lynx:~# pip3 install ssdp
 
−
Collecting ssdp
 
−
  Downloading ssdp-1.1.0-py2.py3-none-any.whl (4.3 kB)
 
−
Installing collected packages: ssdp
 
−
  WARNING: Value for scheme.platlib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Value for scheme.purelib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Additional context:
 
−
  user = False
 
−
  home = None
 
−
  root = None
 
−
  prefix = None
 
−
Successfully installed ssdp-1.1.0
 
−
(desk-env) root@desk-mx6ul-lynx:~# pip3 install scapy
 
−
Collecting scapy
 
−
  Downloading scapy-2.4.5.tar.gz (1.1 MB)
 
−
    |████████████████████████████████| 1.1 MB 1.4 MB/s
 
−
  Preparing metadata (setup.py) ... done
 
−
Building wheels for collected packages: scapy
 
−
  Building wheel for scapy (setup.py) ... done
 
−
  Created wheel for scapy: filename=scapy-2.4.5-py2.py3-none-any.whl size=1261555 sha256=df65309a4f5e0ee8e9f5da16f5b22b41c5a3d0ab03d671f788451874deeca183
 
−
  Stored in directory: /home/root/.cache/pip/wheels/c8/9b/2f/012f0dbaf869afac8be52d4423f34eaa0b6c5c2d1292e40ebd
 
−
Successfully built scapy
 
−
Installing collected packages: scapy
 
−
  WARNING: Value for scheme.platlib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Value for scheme.purelib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Additional context:
 
−
  user = False
 
−
  home = None
 
−
  root = None
 
−
  prefix = None
 
−
Successfully installed scapy-2.4.5
 
−
(desk-env) root@desk-mx6ul-lynx:~# pip3 install nmap
 
−
Collecting nmap
 
−
  Downloading nmap-0.0.1-py3-none-any.whl (2.7 kB)
 
−
Installing collected packages: nmap
 
−
  WARNING: Value for scheme.platlib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Value for scheme.purelib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Additional context:
 
−
  user = False
 
−
  home = None
 
−
  root = None
 
−
  prefix = None
 
−
Successfully installed nmap-0.0.1
 
−
(desk-env) root@desk-mx6ul-lynx:~# pip3 install ujson
 
−
Collecting ujson
 
−
  Downloading ujson-5.1.0.tar.gz (7.1 MB)
 
−
    |████████████████████████████████| 7.1 MB 10 kB/s
 
−
  WARNING: Value for prefixed-purelib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /tmp/pip-build-env-y3_ib386/normal/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Value for prefixed-platlib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /tmp/pip-build-env-y3_ib386/normal/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Additional context:
 
−
  user = False
 
−
  home = None
 
−
  root = None
 
−
  prefix = '/tmp/pip-build-env-y3_ib386/normal'
 
−
  WARNING: Value for prefixed-purelib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /tmp/pip-build-env-y3_ib386/overlay/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Value for prefixed-platlib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /tmp/pip-build-env-y3_ib386/overlay/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Additional context:
 
−
  user = False
 
−
  home = None
 
−
  root = None
 
−
  prefix = '/tmp/pip-build-env-y3_ib386/overlay'
 
−
  WARNING: Value for purelib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Additional context:
 
−
  user = False
 
−
  home = None
 
−
  root = None
 
−
  prefix = None
 
−
  WARNING: Value for platlib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  Installing build dependencies ... done
 
−
  Getting requirements to build wheel ... done
 
−
  Preparing metadata (pyproject.toml) ... done
 
−
Building wheels for collected packages: ujson
 
−
  Building wheel for ujson (pyproject.toml) ... done
 
−
  Created wheel for ujson: filename=ujson-5.1.0-cp39-cp39-linux_armv7l.whl size=37764 sha256=adb6cfae7a4edcd38706c5b910adeee4549af56433bbe17eed89b08f77dd25aa
 
−
  Stored in directory: /home/root/.cache/pip/wheels/5b/11/cb/2e1acde83fd78adc6581984c55442e63d7595711b0b62d8110
 
−
Successfully built ujson
 
−
Installing collected packages: ujson
 
−
  WARNING: Value for scheme.platlib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Value for scheme.purelib does not match. Please report this to <https://github.com/pypa/pip/issues/10151>
 
−
  distutils: /home/root/desk-env/lib/python3.9/site-packages
 
−
  sysconfig: /usr/lib/python3.9/site-packages
 
−
  WARNING: Additional context:
 
−
  user = False
 
−
  home = None
 
−
  root = None
 
−
  prefix = None
 
−
Successfully installed ujson-5.1.0
 
−
(desk-env) root@desk-mx6ul-lynx:~#
 
−
</pre>
 
−
=== check for installed packages and version ===
 
−
<pre class="board-terminal">
 
−
(desk-env) root@desk-mx6ul-lynx:~# pip3 list
 
−
Package            Version
 
−
------------------ ---------
 
−
anyio              3.5.0
 
−
bottle            0.12.19
 
−
certifi            2021.10.8
 
−
charset-normalizer 2.0.10
 
−
click              8.0.3
 
−
contextlib2        21.6.0
 
−
fastapi            0.72.0
 
−
Flask              2.0.2
 
−
idna              3.3
 
−
itsdangerous      2.0.1
 
−
Jinja2            3.0.3
 
−
MarkupSafe        2.0.1
 
−
nmap              0.0.1
 
−
pip                21.3.1
 
−
pydantic          1.9.0
 
−
pymodbus          2.5.3
 
−
pyserial          3.5
 
−
requests          2.27.1
 
−
scapy              2.4.5
 
−
schema            0.7.5
 
−
setuptools        60.5.0
 
−
six                1.16.0
 
−
sniffio            1.2.0
 
−
ssdp              1.1.0
 
−
starlette          0.17.1
 
−
typing_extensions  4.0.1
 
−
ujson              5.1.0
 
−
urllib3            1.26.8
 
−
Werkzeug          2.0.2
 
−
wheel              0.37.1
 
−
(desk-env) root@desk-mx6ul-lynx:~#  
 
 
</pre>
 
</pre>
  
−
=== import packages===
+
As you can see, ''dnf'' automatically manage the dependencies: for example, ''flask '' procedure install also '''Jinja2'', ''Markupsafe'', ''simplejson'', ''Werkzeug''.
 +
 
 +
== import packages==
 
Finally, after the installation steps, it is possible to ''import'' the packages:
 
Finally, after the installation steps, it is possible to ''import'' the packages:
  
 
<pre class="board-terminal">
 
<pre class="board-terminal">
−
(desk-env) root@desk-mx6ul-lynx:~# python3
+
root@desk-mx6ul-axelulite:~# python3
−
Python 3.9.4 (default, Apr  4 2021, 18:23:51)  
+
Python 3.5.5 (default, Jul 16 2020, 16:11:13)
−
[GCC 10.2.0] on linux
+
[GCC 7.3.0] on linux
 
Type "help", "copyright", "credits" or "license" for more information.
 
Type "help", "copyright", "credits" or "license" for more information.
 
>>> import sys
 
>>> import sys
 
>>> import os
 
>>> import os
 
>>> import time
 
>>> import time
 +
>>> import supervisor
 
>>> import ssl
 
>>> import ssl
 
>>> import nmap
 
>>> import nmap
Line 526: Line 418:
 
>>> import requests
 
>>> import requests
 
>>> import flask
 
>>> import flask
−
>>> import fastapi
 
 
>>> import bottle
 
>>> import bottle
 
>>> import ujson
 
>>> import ujson
−
>>>  
+
>>> import paho
−
(desk-env) root@desk-mx6ul-lynx:~#
+
>>>
 
</pre>
 
</pre>

Revision as of 08:15, 7 October 2021

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This application note has been validated using the kit version in the History table.

History[edit | edit source]

Version Date Development Kit version
1.0.0 Oct 2021 DESK-MX6UL-L 1.0.1

Introduction[edit | edit source]

As found on Python official website, Python is a programming language that lets you work more quickly and integrate your systems more effectively and also Python can be easy to pick up whether you're a first-time programmer or you're experienced with other languages.

These sentences got a real confirmation if you have a look at the IEEE Top Programming Languages 2021 ranking. As you can see in the following picture Python reached the Top of the ranking even more than the native C language used since the beginning in Embedded systems programming:


IEEE Top programming languages 2021 - Embedded


As reported in this article The C/C++ programming languages dominate embedded systems programming, though they have a number of disadvantages. Python, on the other hand, has many strengths that make it a great language for embedded systems.

This application note provides some examples of software packages installation that can be used for adding python3 libraries to the SBC Lynx platform.

Python on DESK[edit | edit source]

python and python3 applications are already present on DESK-MX6UL-L dave-image-devel root file system.

Moreover, a huge list of python packages can be installed in the target using the DNF package manager: the DESK-MX6UL-AN-0003 shows how to install rpm packages in the target from the DAVE's Yocto repository server.

Installing python packages[edit | edit source]

First of all check for the default installed python/pip version in the DESK-MX6UL root file system: 

root@desk-mx6ul-axelulite:~# python3 --version
Python 3.5.5
root@desk-mx6ul-axelulite:~# pip --version
pip 20.3.4 from /usr/lib/python3.5/site-packages/pip (python 3.5)
root@desk-mx6ul-axelulite:~# easy3_install --version
setuptools 39.0.0 from /usr/lib/python3.5/site-packages (Python 3.5)
root@desk-mx6ul-axelulite:~#

easy install[edit | edit source]

Even if easy_install tool has been deprecated, it is a useful tool still present in the typical python distributions.

For the purposes of this Application Note, the tool has been used to install some python packages typically used in an Industrial Gateway equipment

In this example, the following packages are installed using easy3_install (easy_install version for python3): pyserial and pymodbus (for bus communications), requests (HTTP library), schema, ssdp: 

root@desk-mx6ul-axelulite:~# easy3_install pyserial
Searching for pyserial
Best match: pyserial 3.4
Adding pyserial 3.4 to easy-install.pth file

Using /usr/lib/python3.5/site-packages
Processing dependencies for pyserial
Finished processing dependencies for pyserial
root@desk-mx6ul-axelulite:~# easy3_install pymodbus
Searching for pymodbus
Reading https://pypi.python.org/simple/pymodbus/
Downloading https://files.pythonhosted.org/packages/57/21/6c9b1cade55161444450bdde6e953edb819d984beafee8d4baefa4f0310c/pymodbus-2.5.3rc1-py2.py3-none-any.whl#sha256=e8cbf3594a8dd0f71c287e24d8365e69836c8d22cac5ab288110638fd2b9fda6
Best match: pymodbus 2.5.3rc1
Processing pymodbus-2.5.3rc1-py2.py3-none-any.whl
Installing pymodbus-2.5.3rc1-py2.py3-none-any.whl to /usr/lib/python3.5/site-packages
writing requirements to /usr/lib/python3.5/site-packages/pymodbus-2.5.3rc1-py3.5.egg/EGG-INFO/requires.txt
Adding pymodbus 2.5.3rc1 to easy-install.pth file
Installing pymodbus.server script to /usr/bin
Installing pymodbus.console script to /usr/bin

Installed /usr/lib/python3.5/site-packages/pymodbus-2.5.3rc1-py3.5.egg
Processing dependencies for pymodbus
Searching for six>=1.15.0
Reading https://pypi.python.org/simple/six/
Downloading https://files.pythonhosted.org/packages/d9/5a/e7c31adbe875f2abbb91bd84cf2dc52d792b5a01506781dbcf25c91daf11/six-1.16.0-py2.py3-none-any.whl#sha256=8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254
Best match: six 1.16.0
Processing six-1.16.0-py2.py3-none-any.whl
Installing six-1.16.0-py2.py3-none-any.whl to /usr/lib/python3.5/site-packages
Adding six 1.16.0 to easy-install.pth file

Installed /usr/lib/python3.5/site-packages/six-1.16.0-py3.5.egg
Finished processing dependencies for pymodbus
root@desk-mx6ul-axelulite:~# easy3_install requests
Searching for requests
Reading https://pypi.python.org/simple/requests/
Downloading https://files.pythonhosted.org/packages/92/96/144f70b972a9c0eabbd4391ef93ccd49d0f2747f4f6a2a2738e99e5adc65/requests-2.26.0-py2.py3-none-any.whl#sha256=6c1246513ecd5ecd4528a0906f910e8f0f9c6b8ec72030dc9fd154dc1a6efd24
Best match: requests 2.26.0
Processing requests-2.26.0-py2.py3-none-any.whl
Installing requests-2.26.0-py2.py3-none-any.whl to /usr/lib/python3.5/site-packages
writing requirements to /usr/lib/python3.5/site-packages/requests-2.26.0-py3.5.egg/EGG-INFO/requires.txt
Adding requests 2.26.0 to easy-install.pth file

Installed /usr/lib/python3.5/site-packages/requests-2.26.0-py3.5.egg
Processing dependencies for requests
Searching for urllib3<1.27,>=1.21.1
Reading https://pypi.python.org/simple/urllib3/
Downloading https://files.pythonhosted.org/packages/af/f4/524415c0744552cce7d8bf3669af78e8a069514405ea4fcbd0cc44733744/urllib3-1.26.7-py2.py3-none-any.whl#sha256=c4fdf4019605b6e5423637e01bc9fe4daef873709a7973e195ceba0a62bbc844
Best match: urllib3 1.26.7
Processing urllib3-1.26.7-py2.py3-none-any.whl
Installing urllib3-1.26.7-py2.py3-none-any.whl to /usr/lib/python3.5/site-packages
writing requirements to /usr/lib/python3.5/site-packages/urllib3-1.26.7-py3.5.egg/EGG-INFO/requires.txt
Adding urllib3 1.26.7 to easy-install.pth file

Installed /usr/lib/python3.5/site-packages/urllib3-1.26.7-py3.5.egg
Searching for charset-normalizer~=2.0.0
Reading https://pypi.python.org/simple/charset-normalizer/
Downloading https://files.pythonhosted.org/packages/3f/65/69e6754102dcd018a0f29e4db673372eb323ee504431125ab6c9109cb21c/charset_normalizer-2.0.6-py3-none-any.whl#sha256=5d209c0a931f215cee683b6445e2d77677e7e75e159f78def0db09d68fafcaa6
Best match: charset-normalizer 2.0.6
Processing charset_normalizer-2.0.6-py3-none-any.whl
Installing charset_normalizer-2.0.6-py3-none-any.whl to /usr/lib/python3.5/site-packages
writing requirements to /usr/lib/python3.5/site-packages/charset_normalizer-2.0.6-py3.5.egg/EGG-INFO/requires.txt
Adding charset-normalizer 2.0.6 to easy-install.pth file
Installing normalizer script to /usr/bin

Installed /usr/lib/python3.5/site-packages/charset_normalizer-2.0.6-py3.5.egg
Searching for certifi>=2017.4.17
Reading https://pypi.python.org/simple/certifi/
Downloading https://files.pythonhosted.org/packages/05/1b/0a0dece0e8aa492a6ec9e4ad2fe366b511558cdc73fd3abc82ba7348e875/certifi-2021.5.30-py2.py3-none-any.whl#sha256=50b1e4f8446b06f41be7dd6338db18e0990601dce795c2b1686458aa7e8fa7d8
Best match: certifi 2021.5.30
Processing certifi-2021.5.30-py2.py3-none-any.whl
Installing certifi-2021.5.30-py2.py3-none-any.whl to /usr/lib/python3.5/site-packages
Adding certifi 2021.5.30 to easy-install.pth file

Installed /usr/lib/python3.5/site-packages/certifi-2021.5.30-py3.5.egg
Finished processing dependencies for requests
root@desk-mx6ul-axelulite:~# easy3_install schema
Searching for schema
Reading https://pypi.python.org/simple/schema/
Downloading https://files.pythonhosted.org/packages/c7/64/497632c9dc3c1bc94a92d9cafdc5cbd21d011bb651952765195739129a49/schema-0.7.4-py2.py3-none-any.whl#sha256=cf97e4cd27e203ab6bb35968532de1ed8991bce542a646f0ff1d643629a4945d
Best match: schema 0.7.4
Processing schema-0.7.4-py2.py3-none-any.whl
Installing schema-0.7.4-py2.py3-none-any.whl to /usr/lib/python3.5/site-packages
writing requirements to /usr/lib/python3.5/site-packages/schema-0.7.4-py3.5.egg/EGG-INFO/requires.txt
Adding schema 0.7.4 to easy-install.pth file

Installed /usr/lib/python3.5/site-packages/schema-0.7.4-py3.5.egg
Processing dependencies for schema
Searching for contextlib2>=0.5.5
Reading https://pypi.python.org/simple/contextlib2/
Downloading https://files.pythonhosted.org/packages/76/56/6d6872f79d14c0cb02f1646cbb4592eef935857c0951a105874b7b62a0c3/contextlib2-21.6.0-py2.py3-none-any.whl#sha256=3fbdb64466afd23abaf6c977627b75b6139a5a3e8ce38405c5b413aed7a0471f
Best match: contextlib2 21.6.0
Processing contextlib2-21.6.0-py2.py3-none-any.whl
Installing contextlib2-21.6.0-py2.py3-none-any.whl to /usr/lib/python3.5/site-packages
Adding contextlib2 21.6.0 to easy-install.pth file

Installed /usr/lib/python3.5/site-packages/contextlib2-21.6.0-py3.5.egg
Finished processing dependencies for schema
root@desk-mx6ul-axelulite:~# easy3_install ssdp
Searching for ssdp
Reading https://pypi.python.org/simple/ssdp/
Downloading https://files.pythonhosted.org/packages/1d/04/d761ea63c8cb9e0e8a37cc63df9ec39c8c6a0f77363d131035b694758a5d/ssdp-1.1.0-py2.py3-none-any.whl#sha256=dc91a844e54ba6b1a2f3be4d9a52302027f71719c5eb2c0e6fbd77e67e7343ad
Best match: ssdp 1.1.0
Processing ssdp-1.1.0-py2.py3-none-any.whl
Installing ssdp-1.1.0-py2.py3-none-any.whl to /usr/lib/python3.5/site-packages
Adding ssdp 1.1.0 to easy-install.pth file

Installed /usr/lib/python3.5/site-packages/ssdp-1.1.0-py3.5.egg
Processing dependencies for ssdp
Finished processing dependencies for ssdp
root@desk-mx6ul-axelulite:~#

Then, add some useful IP packages like nmap or scapy (network packet manipulation): 

root@desk-mx6ul-axelulite:~# easy3_install nmap
Searching for nmap
Reading https://pypi.python.org/simple/nmap/
Downloading https://files.pythonhosted.org/packages/f8/6f/6813025bd575ebc771189afaab7c405fdf3f1febaa197525d5aa6fd88ac5/nmap-0.0.1-py3-none-any.whl#sha256=158de16af02043e1a2015662ad1710dfb46dadd2bea8e9d90ba16b78b6650098
Best match: nmap 0.0.1
Processing nmap-0.0.1-py3-none-any.whl
Installing nmap-0.0.1-py3-none-any.whl to /usr/lib/python3.5/site-packages
Adding nmap 0.0.1 to easy-install.pth file

Installed /usr/lib/python3.5/site-packages/nmap-0.0.1-py3.5.egg
Processing dependencies for nmap
Finished processing dependencies for nmap
root@desk-mx6ul-axelulite:~# easy3_install scapy
Searching for scapy
Reading https://pypi.python.org/simple/scapy/
Downloading https://files.pythonhosted.org/packages/85/47/c919432ca258f354bb2c1e645623f891603f185bfc7563d4a21f6432e7ed/scapy-2.4.5.tar.gz#sha256=bc707e3604784496b6665a9e5b2a69c36cc9fb032af4864b29051531b24c8593
Best match: scapy 2.4.5
Processing scapy-2.4.5.tar.gz
Writing /tmp/easy_install-vsqq0ans/scapy-2.4.5/setup.cfg
Running scapy-2.4.5/setup.py -q bdist_egg --dist-dir /tmp/easy_install-vsqq0ans/scapy-2.4.5/egg-dist-tmp-nauxdhas
/usr/lib/python3.5/distutils/dist.py:261: UserWarning: Unknown distribution option: 'long_description_content_type'
  warnings.warn(msg)
creating /usr/lib/python3.5/site-packages/scapy-2.4.5-py3.5.egg
Extracting scapy-2.4.5-py3.5.egg to /usr/lib/python3.5/site-packages
Adding scapy 2.4.5 to easy-install.pth file
Installing scapy script to /usr/bin
Installing UTscapy script to /usr/bin

Installed /usr/lib/python3.5/site-packages/scapy-2.4.5-py3.5.egg
Processing dependencies for scapy
Finished processing dependencies for scapy
root@desk-mx6ul-axelulite:~#

On top of that, some web packages are very useful for creating web application and remotely control/get information from the gateway: bottle (lightweight WSGI micro web-framework), fastapi (high-performance web framework): 

root@desk-mx6ul-axelulite:~# easy3_install bottle
Searching for bottle
Reading https://pypi.python.org/simple/bottle/
Downloading https://files.pythonhosted.org/packages/bf/44/aeafdd6ca05a8e1c3f91eeeb272a202d5cb1b3b23730a5ca686a81c48d24/bottle-0.12.19-py3-none-any.whl#sha256=f6b8a34fe9aa406f9813c02990db72ca69ce6a158b5b156d2c41f345016a723d
Best match: bottle 0.12.19
Processing bottle-0.12.19-py3-none-any.whl
Installing bottle-0.12.19-py3-none-any.whl to /usr/lib/python3.5/site-packages
Adding bottle 0.12.19 to easy-install.pth file
Installing bottle.py script to /usr/bin

Installed /usr/lib/python3.5/site-packages/bottle-0.12.19-py3.5.egg
Processing dependencies for bottle
Finished processing dependencies for bottle
root@desk-mx6ul-axelulite:~# easy3_install fastapi
Searching for fastapi
Reading https://pypi.python.org/simple/fastapi/
Downloading https://files.pythonhosted.org/packages/92/a8/10d8a171afa66e6e8a5cfe82771d11c4c84a2a874c19c0b55c7099001fac/fastapi-0.68.2-py3-none-any.whl#sha256=36bcdd3dbea87c586061005e4a40b9bd0145afd766655b4e0ec1d8870b32555c
Best match: fastapi 0.68.2
Processing fastapi-0.68.2-py3-none-any.whl
Installing fastapi-0.68.2-py3-none-any.whl to /usr/lib/python3.5/site-packages
writing requirements to /usr/lib/python3.5/site-packages/fastapi-0.68.2-py3.5.egg/EGG-INFO/requires.txt
Adding fastapi 0.68.2 to easy-install.pth file

Installed /usr/lib/python3.5/site-packages/fastapi-0.68.2-py3.5.egg
Processing dependencies for fastapi
Searching for starlette==0.14.2
Reading https://pypi.python.org/simple/starlette/
Downloading https://files.pythonhosted.org/packages/15/34/db1890f442a1cd3a2c761f4109a0eb4e63503218d70a8c8e97faa09a5500/starlette-0.14.2-py3-none-any.whl#sha256=3c8e48e52736b3161e34c9f0e8153b4f32ec5d8995a3ee1d59410d92f75162ed
Best match: starlette 0.14.2
Processing starlette-0.14.2-py3-none-any.whl
Installing starlette-0.14.2-py3-none-any.whl to /usr/lib/python3.5/site-packages
writing requirements to /usr/lib/python3.5/site-packages/starlette-0.14.2-py3.5.egg/EGG-INFO/requires.txt
Adding starlette 0.14.2 to easy-install.pth file

Installed /usr/lib/python3.5/site-packages/starlette-0.14.2-py3.5.egg
Searching for pydantic!=1.7,!=1.7.1,!=1.7.2,!=1.7.3,!=1.8,!=1.8.1,<2.0.0,>=1.6.2
Reading https://pypi.python.org/simple/pydantic/
Downloading https://files.pythonhosted.org/packages/ff/74/54e030641601112309f6d2af620774e9080f99c7a15742fc6a0b170c4076/pydantic-1.8.2-py3-none-any.whl#sha256=fec866a0b59f372b7e776f2d7308511784dace622e0992a0b59ea3ccee0ae833
Best match: pydantic 1.8.2
Processing pydantic-1.8.2-py3-none-any.whl
Installing pydantic-1.8.2-py3-none-any.whl to /usr/lib/python3.5/site-packages
writing requirements to /usr/lib/python3.5/site-packages/pydantic-1.8.2-py3.5.egg/EGG-INFO/requires.txt
Adding pydantic 1.8.2 to easy-install.pth file

Installed /usr/lib/python3.5/site-packages/pydantic-1.8.2-py3.5.egg
Searching for typing-extensions>=3.7.4.3
Reading https://pypi.python.org/simple/typing-extensions/
Downloading https://files.pythonhosted.org/packages/74/60/18783336cc7fcdd95dae91d73477830aa53f5d3181ae4fe20491d7fc3199/typing_extensions-3.10.0.2-py3-none-any.whl#sha256=f1d25edafde516b146ecd0613dabcc61409817af4766fbbcfb8d1ad4ec441a34
Best match: typing-extensions 3.10.0.2
Processing typing_extensions-3.10.0.2-py3-none-any.whl
Installing typing_extensions-3.10.0.2-py3-none-any.whl to /usr/lib/python3.5/site-packages
Adding typing-extensions 3.10.0.2 to easy-install.pth file

Installed /usr/lib/python3.5/site-packages/typing_extensions-3.10.0.2-py3.5.egg
Finished processing dependencies for fastapi

and finally an MQTT client like Eclipse paho MQTT is installed too: 

root@desk-mx6ul-axelulite:~# easy3_install paho-mqtt
Searching for paho-mqtt
Reading https://pypi.python.org/simple/paho-mqtt/
Downloading https://files.pythonhosted.org/packages/32/d3/6dcb8fd14746fcde6a556f932b5de8bea8fedcb85b3a092e0e986372c0e7/paho-mqtt-1.5.1.tar.gz#sha256=9feb068e822be7b3a116324e01fb6028eb1d66412bf98595ae72698965cb1cae
Best match: paho-mqtt 1.5.1
Processing paho-mqtt-1.5.1.tar.gz
Writing /tmp/easy_install-vkarrpqi/paho-mqtt-1.5.1/setup.cfg
Running paho-mqtt-1.5.1/setup.py -q bdist_egg --dist-dir /tmp/easy_install-vkarrpqi/paho-mqtt-1.5.1/egg-dist-tmp-tt8lku70
creating /usr/lib/python3.5/site-packages/paho_mqtt-1.5.1-py3.5.egg
Extracting paho_mqtt-1.5.1-py3.5.egg to /usr/lib/python3.5/site-packages
Adding paho-mqtt 1.5.1 to easy-install.pth file

Installed /usr/lib/python3.5/site-packages/paho_mqtt-1.5.1-py3.5.egg
Processing dependencies for paho-mqtt
Finished processing dependencies for paho-mqtt
root@desk-mx6ul-axelulite:~#

DNF[edit | edit source]

In case of some troubles (which can happens using easy_install or pip), other packages can be directly installed using dnf from the already built rpm packages built with Yocto:

For example, for installing flask or ujson it is possible to use dnf install <rpm-package>: 

root@desk-mx6ul-axelulite:~# dnf install python3-flask
Last metadata expiration check: 0:13:01 ago on Wed Oct  6 08:39:56 2021.
Dependencies resolved.
================================================================================
 Package                   Arch               Version       Repository     Size
================================================================================
Installing:
 python3-flask             cortexa7hf_neon    0.12.2-r0     cortexa7hf    110 k
Installing dependencies:
 python3-click             cortexa7hf_neon    6.7-r0        cortexa7hf    110 k
 python3-itsdangerous      cortexa7hf_neon    0.24-r0       cortexa7hf     23 k
 python3-jinja2            cortexa7hf_neon    2.10-r0       cortexa7hf    187 k
 python3-markupsafe        cortexa7hf_neon    1.0-r0        cortexa7hf     25 k
 python3-simplejson        cortexa7hf_neon    3.13.2-r0     cortexa7hf     50 k
 python3-werkzeug          cortexa7hf_neon    0.14.1-r0     cortexa7hf    375 k
 python3-werkzeug-tests    cortexa7hf_neon    0.14.1-r0     cortexa7hf     32 k

Transaction Summary
================================================================================
Install  8 Packages

Total download size: 912 k
Installed size: 3.7 M
Is this ok [y/N]: y
Downloading Packages:
(1/8): python3-itsdangerous-0.24-r0.cortexa7hf_ 128 kB/s |  23 kB     00:00
(2/8): python3-flask-0.12.2-r0.cortexa7hf_neon. 344 kB/s | 110 kB     00:00
(3/8): python3-click-6.7-r0.cortexa7hf_neon.rpm 329 kB/s | 110 kB     00:00
(4/8): python3-jinja2-2.10-r0.cortexa7hf_neon.r 508 kB/s | 187 kB     00:00
(5/8): python3-werkzeug-tests-0.14.1-r0.cortexa 137 kB/s |  32 kB     00:00
(6/8): python3-markupsafe-1.0-r0.cortexa7hf_neo 318 kB/s |  25 kB     00:00
(7/8): python3-simplejson-3.13.2-r0.cortexa7hf_ 220 kB/s |  50 kB     00:00
(8/8): python3-werkzeug-0.14.1-r0.cortexa7hf_ne 684 kB/s | 375 kB     00:00
--------------------------------------------------------------------------------
Total                                           979 kB/s | 912 kB     00:00
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                        1/1
  Installing       : python3-werkzeug-0.14.1-r0.cortexa7hf_neon             1/8
  Installing       : python3-werkzeug-tests-0.14.1-r0.cortexa7hf_neon       2/8
  Installing       : python3-markupsafe-1.0-r0.cortexa7hf_neon              3/8
  Installing       : python3-jinja2-2.10-r0.cortexa7hf_neon                 4/8
  Installing       : python3-simplejson-3.13.2-r0.cortexa7hf_neon           5/8
  Installing       : python3-itsdangerous-0.24-r0.cortexa7hf_neon           6/8
  Installing       : python3-click-6.7-r0.cortexa7hf_neon                   7/8
  Installing       : python3-flask-0.12.2-r0.cortexa7hf_neon                8/8
  Verifying        : python3-flask-0.12.2-r0.cortexa7hf_neon                1/8
  Verifying        : python3-click-6.7-r0.cortexa7hf_neon                   2/8
  Verifying        : python3-itsdangerous-0.24-r0.cortexa7hf_neon           3/8
  Verifying        : python3-jinja2-2.10-r0.cortexa7hf_neon                 4/8
  Verifying        : python3-werkzeug-0.14.1-r0.cortexa7hf_neon             5/8
  Verifying        : python3-werkzeug-tests-0.14.1-r0.cortexa7hf_neon       6/8
  Verifying        : python3-simplejson-3.13.2-r0.cortexa7hf_neon           7/8
  Verifying        : python3-markupsafe-1.0-r0.cortexa7hf_neon              8/8

Installed:
  python3-flask.cortexa7hf_neon 0.12.2-r0
  python3-click.cortexa7hf_neon 6.7-r0
  python3-itsdangerous.cortexa7hf_neon 0.24-r0
  python3-jinja2.cortexa7hf_neon 2.10-r0
  python3-markupsafe.cortexa7hf_neon 1.0-r0
  python3-simplejson.cortexa7hf_neon 3.13.2-r0
  python3-werkzeug.cortexa7hf_neon 0.14.1-r0
  python3-werkzeug-tests.cortexa7hf_neon 0.14.1-r0

Complete!
root@desk-mx6ul-axelulite:~# dnf install python3-ujson
Last metadata expiration check: 1:31:56 ago on Wed Oct  6 08:39:56 2021.
Dependencies resolved.
================================================================================
 Package             Arch                  Version       Repository        Size
================================================================================
Installing:
 python3-ujson       cortexa7hf_neon       1.35-r0       cortexa7hf        24 k

Transaction Summary
================================================================================
Install  1 Package

Total download size: 24 k
Installed size: 59 k
Is this ok [y/N]: y
Downloading Packages:
python3-ujson-1.35-r0.cortexa7hf_neon.rpm        22 kB/s |  24 kB     00:01
--------------------------------------------------------------------------------
Total                                            21 kB/s |  24 kB     00:01
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                        1/1
  Installing       : python3-ujson-1.35-r0.cortexa7hf_neon                  1/1
  Verifying        : python3-ujson-1.35-r0.cortexa7hf_neon                  1/1

Installed:
  python3-ujson.cortexa7hf_neon 1.35-r0

Complete!
root@desk-mx6ul-axelulite:~#

As you can see, dnf automatically manage the dependencies: for example, flask procedure install also 'Jinja2, Markupsafe, simplejson, Werkzeug.

import packages[edit | edit source]

Finally, after the installation steps, it is possible to import the packages: 

root@desk-mx6ul-axelulite:~# python3
Python 3.5.5 (default, Jul 16 2020, 16:11:13)
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> import os
>>> import time
>>> import supervisor
>>> import ssl
>>> import nmap
>>> import scapy
>>> import serial
>>> import pymodbus
>>> import schema
>>> import ssdp
>>> import requests
>>> import flask
>>> import bottle
>>> import ujson
>>> import paho
>>>
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