No module named python pycharm

So why on Earth does the script blows up with an error while using Run button but runs smoothly from the command line both inside IntelliJ IDEA and PyCharm?

Process of debugging

Idea 1. Tinker everything inside Project Structure settings

The following examples will be from IntelliJ IDEA but almost the same thing happening in the PyCharm.

I was trying to change project interpreter SDK/Setting, create module (inside project structure settings) for absolute no reason just to test if it helps. There's not much I could say about this idea, but this process goes in circle for a few hours in and Googling related things at the same time.

Idea 2. Test in other IDE

After trying the same thing for a few hours I tried to test if the same behavior will be in other IDE's such as PyCharm and VSCode. And the answer is "Yes", same behavior, in terminal runs, via Run button explodes with an error.

At that point I understand that something happening inside IDE since running from a command line everything runs as it should, so I focused on figuring out what causes error inside IDE.

Idea 3. Google "pycharm not recognizing installed packages"

At this point I was trying to formulate a problem in order to google it. The first Google results was exactly what I was looking for PyCharm doesn't recognise installed module.

This is the answer that helped to solve the problem which said:

Pycharm is unable to recognize installed local modules, since python interpreter selected is wrong. It should be the one, where your pip packages are installed i.e. virtual environment.

The person who answer the question had the similar problem I had:

I had installed packages via pip in Windows. In Pycharm, they were neither detected nor any other Python interpreter was being shown (only python 3.6 is installed on my system).

Step 4. Change Project SDK to python.exe from virtual environment

In order to make it work I first found where python.exe inside virtual environment folder is located, and copied the full path.

Then, go to Project Structure settings (CTRL+ALT+SHIFT+S) -> SDK's -> Add new SDK -> Add Python SDK -> System interpreter -> changed existing path to the one I just copied. Done!

One thing left. We also need to change Python interpreter path inside Run Configuration to the one that was just created inside System Interpreter under Project Structure :

Changing Python interpreter path from the default one:

Additional Thoughts

I'm not creating another virtual environment ( venv ) that PyCharm provides because I already create it from the command line beforehand, that's why I change path inside System Interpreter.

It can be also achieved by creating new Virtual Environment instead of creating it from command line (basically the same process as described above):

• Set Base Interpreter to whatever Python version is running.
• Make sure that Project SDK ( Project Structure window) is set to the one from Virtual Environment ( Python 3.9 (some words) ).
• Open Run Configuration -> Python Interpreter -> Use specific interpreter path is set to python.exe path from the venv folder (e.g. newly created virtual environment ).

Note: When using such method, Bash commands not found for unknown for me reason.

$ which python bash: which: command not found ()