environment package in python

I think there are way too many environment handling packages out there (at PyPi) to get confused.

1. One is environ which was last released in 2007 - https://pypi.org/project/environ/ - which is Python 2 based. We don't want this anymore.

2. What we normally use in a pure python script is python-environ - https://pypi.org/project/python-environ/ - last released in 2020 - but the page is all about the next environ pypi package I've mentioned about - django-environ

3. Then we have django-environ which is what is the latest - https://pypi.org/project/django-environ/ - last released in 2023 - this works perfectly on non-Django environments as well. Since its just a wrapper and also referred to by python-environ package page, we are better off using this package only.

python -m pip install environ
Collecting environ
  Downloading environ-1.0.tar.gz (2.6 kB)
  Preparing metadata (setup.py) ... done
Installing collected packages: environ
  DEPRECATION: environ is being installed using the legacy 'setup.py install' method, because it does not have a 'pyproject.toml' and the 'wheel' package is not installed. pip 23.1 will enforce this behaviour change. A possible replacement is to enable the '--use-pep517' option. Discussion can be found at https://github.com/pypa/pip/issues/8559
  Running setup.py install for environ ... done
Successfully installed environ-1.0

(env) PS D:\> python .\test.py
Traceback (most recent call last):
  File "D:\test.py", line 5, in <module>
    import environ
  File "D:\env\lib\site-packages\environ.py", line 114
    raise ValueError, "No frame marked with %s." % fname
                    ^
SyntaxError: invalid syntax
(env) PS D:\> python -m pip uninstall environ
Found existing installation: environ 1.0
Uninstalling environ-1.0:
  Would remove:
    d:\env\lib\site-packages\environ-1.0-py3.10.egg-info
    d:\env\lib\site-packages\environ.py
Proceed (Y/n)? Y
  Successfully uninstalled environ-1.0
(env) PS D:\> python .\test.py
Traceback (most recent call last):
  File "D:\test.py", line 5, in <module>
    import environ
ModuleNotFoundError: No module named 'environ'
(env) PS D:\> python -m pip install python-environ
Collecting python-environ
  Using cached python_environ-0.4.54-py2.py3-none-any.whl
Installing collected packages: python-environ
Successfully installed python-environ-0.4.54

(env) PS D:\> python -m pip uninstall python-environ
Found existing installation: python-environ 0.4.54
Uninstalling python-environ-0.4.54:
  Would remove:
    d:\env\lib\site-packages\environ\*
    d:\env\lib\site-packages\python_environ-0.4.54.dist-info\*
Proceed (Y/n)? Y
  Successfully uninstalled python-environ-0.4.54
(env) PS D:\> python -m pip install django-environ
Collecting django-environ
  Using cached django_environ-0.11.2-py2.py3-none-any.whl (19 kB)
Installing collected packages: django-environ
Successfully installed django-environ-0.11.2