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From: rbowman <bowman@montana.com>
Newsgroups: comp.lang.python
Subject: Re: Pip installs to unexpected place
Date: 20 Apr 2025 04:34:39 GMT
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On Sat, 19 Apr 2025 15:56:16 -0400, Thomas Passin wrote:

> My problem with venvs, especially if I have more than one, is that I
> eventually forget what they were for and what is different about each
> one. If there's only one and it's used for all non-system work, that's
> OK but beyond that and they tend to suffer knowledge rot.

My Python directory has

apple/   create/  fastapi/  lunar/  numerical/  pyside6/  weather/
comics/  django/  folium/   ml/  sqlite/  coursera/  impractical/
nn/  pyqt/  torch/

Not all like sqlite are venvs since no additional modules are needed. Even 
if I'm a little hazy about 'apple' after a while a quick look at the 
Python file shows 'https://itunes.apple.com/search' and I remember it is 
to pull down artist/track info from the itunes database.

I also try to remember to run 'pythom -m pip freeze > requirements.txt' 
after I get everything set up. That way if a OS update installs a new 
version of Python  something like

python3 -m venv folium
cd folium
.. bin/activate
python -m pip install -r requirements.txt

will refresh the venv and install the appropriate packages for the new 
Python version. That's faster than looking at lib/python3.10/site-packages 
or whatever the previous version was and adding the dependencies  or 
trying to run the py file and getting

Traceback (most recent call last):
  File "/home/rbowman/work/python/impractical/benford.py", line 5, in 
<module>
    import matplotlib.pyplot as plt
ModuleNotFoundError: No module named 'matplotlib'