执行在不同虚拟环境/venv下构建的python脚本？

Question

I apologize if what I'm trying to achieve is not Pythonic - I recently moved to the language.

I have a project directory structured like so:

root
--proj1
----venv
----main.py
--proj2
----venv
----main.py

Both proj1 and proj2 run under their own virtual environments. I am trying to call proj2/main.py from proj1/main.py, whilst executing proj2/main.py under its own venv. I have tried:

import subprocess

s2_out = subprocess.check_output([sys.executable, r"..\proj2\__main__.py", "arg"])

This invokes successfully, but I am getting all manner of not found exceptions, etc. I am guessing this is the reason why.

Please let me know if there is a better approach!

Answer 1

You can do this:

import subprocess
subprocess.call(["python_interpreter location (python.exe)", "python file"])

So you could do:

import subprocess
subprocess.call(["../proj2/bin/python.exe", "proj2/main.py"])

For Mac OS and Linux, the python interpreter path for a venv would be folder/bin/python.exe , or in your case ../proj2/bin/python.exe .

For Windows, the python interpreter path for a venv would be folder/scripts/python.exe .

You may need to include the full paths.

Another way to do this could be using subprocess.call , if you need the output:

import subprocess

output = subprocess.call("%s %s" %("../proj2/bin/python.exe", "proj2/main.py"))
print(output)

Both ways will work just fine:)

Answer 2

Hey this is not a complete answer but is how I would approach it. If you use pyenv then this would be the approach:

1. Make a separate virtualenv for each project. pyenv virtualenv 3.8 proj1 and pyenv virtualenv 3.7 proj1 or whatever the python versions are.
2. use pyenv local in each directory to link the dirs to the venvs
3. cd to each directory and in each one the python env should activate. Use pip install to install the libs to each venv.
4. Now you should have access to different python executables that use separate libs, eg ~/.pyenv/versions/proj1/bin/python
5. So from proj1 code you should theoretically be able to do:

import os;
os.system("~/.pyenv/versions/proj2/bin/python ../proj2/main.py")

or something like that. I have not actually tried this but I am fairly certain it would work for using separate libs.

Here is pyenv: https://github.com/pyenv/pyenv

I will try it myself tomorrow when I am not sleepy.