How to install two different versions of s2p?

[lionlai1989]

Hi:
Is it possible to install two different versions of s2p on my laptop?
My laptop now has MISS3D/s2p.https://github.com/MISS3D/s2p
But I want to try cmla/s2p without uninstall the MISS3D/s2p.
I first rename /usr/local/bin/s2p to /usr/local/bin/s2p_old, then I download the cmla/s2p. After, I modified the name entry in setup.py (cmla/s2p) to s2p-new and version entry, but it doesn't work out.
Any suggestion will be appreciated. Thank you very much.

[carlodef]

Hi @lionlai1989, a possible way of doing that would be to use virtual environments: https://docs.python.org/3/tutorial/venv.html

[lionlai1989]

Hi @carlodef Could you please explain more how to do it? I tried, but could not succeed. My steps are the following.

1. Create s2p_venv.
2. cd s2p_venv and activate s2p_venv.
3. Download cmla/s2p to s2p_venv.
4. cd cmla/s2p and execute pip install -e .
5. But it still run the old s2p instead of the new one. However, it run the s2p in the venv /home/ubuntu/venv_cmla_s2p/bin/s2p.
   I modified the cli.py to see which s2p it executes.
   I think now the question is when the shell run s2p, how does it know which cli.py it should execute. If I can redirect that to a new cli.py, does it mean that it run the new s2p instead of the old one.

[carlodef]

Hi @lionlai1989, I don't understand your step 2: you don't need to cd to a specific directory in order to activate a virtual environment.

When you activate an environment, you can check which version of python, pip and s2p are used by using the command which. For example:

which python

should give different results in different virtual environments