Python Venv does not see the library, what's the problem?

Question

Python

Good afternoon!
There is an application that runs in venv and I needed to add a library to the virtual environment of this application.
I did the following: through pip installed in the virtual environment of this application, I installed the library with the command /folder/bin/pip install pysocks,
but when I run python with the command /folder/bin/python, the library is not imported.
Where did I make a mistake?