virtualenv - frustrations over python venv and global modules

Question

I wrote a web scraping programming a couple of months ago, which I had python -m venv venv did a bunch of pip install, checked and doubled check with pip list, everything looks fine.

And today I wanna scrape again so I did my source venv/bin/activate checked with pip list, everything looks fine, and just keep having no module of this and that...

But when I deactivated it, it falls back to my global installed modules, my program runs perfectly fine. I could't believe it so i did : rm -rf venv and python -m venv source venv/bin/activate pip install -r requirements.txt everything installed, check with pip list, and no module of this or that.

Anyone, please tell me what's happening? thank you!

Answer 1

To ensure what python is being used and which python is linked to current pip:

• which python to see where is the python executable (alternatively which python3, which python3.7, etc...)
• running python show the version of python
• pip -V shows the python to which it is linked
• use python -m pip list to ensure the pip is linked to the python
• python -m site shows were is the site-package located
• writing python and hitting TAB multiple times shows what pythons are available in the path (os dependent)

This is more of a way to debug which python is being used.