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DESK-MX6UL-AN-0004: Using Python for Embedded applications

6,283 bytes added, 09:14, 10 January 2023
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|-
| 2.0.0
| --- Apr 2022
|[[DESK-MX6UL-L/General/Release_Notes#DESK-MX6UL-L_3.0.0|DESK-MX6UL-L 3.0.0]]
|-
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"''
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).
* for example, create the <code>virtual environment</code> named '''desk'''
<pre class="board-terminal">
root@desk-mx6ul-lynx:~# source desk-env/bin/activate
</pre>
* check and update ''pip3'' in the the <code>virtual environment</code>
<pre class="board-terminal">
(desk-env) root@desk-mx6ul-lynx:~# which pip3
/home/root/desk-env/bin/pip3
(desk-env) root@desk-mx6ul-lynx:~#</pre>* update ''pip3'' in the the <code>virtual environment</code><pre class="board-terminal">(desk-env) root@desk-mx6ul-lynx:~# /home/root/desk-env/bin/python3 -m pip install --upgrade pip
Collecting pip
Using cached pip-21.3.1-py3-none-any.whl (1.7 MB)
Successfully uninstalled pip-20.2.3
Successfully installed pip-21.3.1
(desk-env) root@desk-mx6ul-lynx:~# /home/root/desk-env/bin/pip3 --version
pip 21.3.1 from /home/root/desk-env/lib/python3.9/site-packages/pip (python 3.9)
(desk-env) root@desk-mx6ul-lynx:~#
</pre>
In this way it is possible to * <code>setuptools</code> can be upgraded too: <pre class="board-terminal">(desk-env) root@desk-mx6ul-lynx:~# pip3 install the required --upgrade setuptoolsRequirement already satisfied: setuptools in ./desk-env/lib/python3.9/site-packages (with their specific version required49.2.1) only in Collecting setuptools Using cached setuptools-60.5.0-py3-none-any.whl (958 kB)Installing collected packages: setuptools Attempting uninstall: setuptools Found existing installation: setuptools 49.2.1 Uninstalling setuptools-49.2.1: Successfully uninstalled setuptools-49.2.1 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 ''virtual environment'' 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 = NoneSuccessfully installed setuptools-60.5.0(which may differ from desk-env) root@desk-mx6ul-lynx:~# </pre> Afterword, the ''[https://pypi.org/project/wheel/ wheel] package is worth to be installed for further package installation:<pre class="board-terminal">(desk-env) root'' installation@desk-mx6ul-lynx:~# pip3 install wheelCollecting wheel Using cached wheel-0.37.1-py2.py3-none-any.whl (35 kB)Installing collected packages: wheel 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 = NoneSuccessfully installed wheel-0.37.1(desk-env) root@desk-mx6ul-lynx:~#</pre>
=== pip package installation===
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/sCollecting 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/sCollecting starlette==0.17.1 Downloading starlette-0.17.1-py3-none-any.whl (58 kB) |████████████████████████████████| 58 kB 619 kB/sCollecting anyio<4,>=3.0.0 Downloading anyio-3.5.0-py3-none-any.whl (79 kB) |████████████████████████████████| 79 kB 797 kB/sCollecting 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>
prefix = None
Successfully installed pyserial-3.5
(desk-env) root@desk-mx6ul-lynx:~# pip3 install modbuspymodbus
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)
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 68 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 594 619 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 2.3 MB/s
Collecting anyio<4,>=3.0.0
Downloading anyio-3.5.0-py3-none-any.whl (79 kB)
|###############################████████████████████████████████| 79 kB 729 797 kB/s
Collecting typing-extensions>=3.7.4.3
Downloading typing_extensions-4.0.1-py3-none-any.whl (22 kB)
Collecting idna>=2.8
Downloading idna-3.3-py3-none-any.whl (61 kB)
|###############################████████████████████████████████| 61 kB 805 770 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>
Collecting bottle
Downloading bottle-0.12.19-py3-none-any.whl (89 kB)
|################################████████████████████████████████| 89 kB 688 724 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>
Collecting requests
Downloading requests-2.27.1-py2.py3-none-any.whl (63 kB)
|##############################████████████████████████████████| 63 kB 124 141 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)
Requirement already satisfied: idna<4,Collecting certifi>=22017.4.17 Downloading certifi-2021.5 in 10./desk8-env/lib/python3py2.9/sitepy3-none-packages any.whl (from requests149 kB) (3 |████████████████████████████████| 149 kB 2.3)2 MB/s
Collecting urllib3<1.27,>=1.21.1
Downloading urllib3-1.26.8-py2.py3-none-any.whl (138 kB)
|##############################████████████████████████████████| 138 kB 632 kB/s Collecting certifi>=20172.4.17 Downloading certifi-2021.10.8-py2.py3-none-any.whl (149 kB) |###########################| 149 kB 547 kB2 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>
Collecting scapy
Downloading scapy-2.4.5.tar.gz (1.1 MB)
|#########████████████████████████████████| 1.1 MB 1.3 4 MB/s Preparing metadata (setup.py) ... - \ doneUsing legacy 'Building wheels for collected packages: scapy Building wheel for scapy (setup.py install' ) ... done Created wheel for scapy, since package 'wheel' is not installed: 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/012f0dbaf869afac8be52d4423f34eaa0b6c5c2d1292e40ebdSuccessfully 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>
root = None
prefix = None
Running setup.py install for scapy ... / - \ | / done
Successfully installed scapy-2.4.5
(desk-env) root@desk-mx6ul-lynx:~# pip3 install nmap
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-aajn4vfiy3_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-aajn4vfiy3_ib386/normal/lib/python3.9/site-packages
sysconfig: /usr/lib/python3.9/site-packages
WARNING: Additional context:
home = None
root = None
prefix = '/tmp/pip-build-env-aajn4vfiy3_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-aajn4vfiy3_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-aajn4vfiy3_ib386/overlay/lib/python3.9/site-packages
sysconfig: /usr/lib/python3.9/site-packages
WARNING: Additional context:
home = None
root = None
prefix = '/tmp/pip-build-env-aajn4vfiy3_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
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=10ac0ac0859d098528a5985fb09ddc0dcb2e7682ff9d587cbae8be01dafe3eddadb6cfae7a4edcd38706c5b910adeee4549af56433bbe17eed89b08f77dd25aa
Stored in directory: /home/root/.cache/pip/wheels/5b/11/cb/2e1acde83fd78adc6581984c55442e63d7595711b0b62d8110
Successfully built ujson
prefix = None
Successfully installed ujson-5.1.0
(desk-env) root@desk-mx6ul-lynx:~#
</pre>
=== check for installed packages and version ===
scapy 2.4.5
schema 0.7.5
setuptools 4960.25.10
six 1.16.0
sniffio 1.2.0
>>> import requests
>>> import flask
>>> import fastapi
>>> import bottle
>>> import ujson
>>> import fastapi
>>>
(desk-env) root@desk-mx6ul-lynx:~#
</pre>
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