A hidden library?

[gontajones]

He has to check if pip is really installing modules for the python interpreter that he is running his scripts.

He can investigate it with:
1 - Check pip version and its bond python interpreter.
$ pip -V

2 - Then check if the module was really installed.
$ pip list

3 - Modules that have - in their names must be imported with _.
Example:
$ pip install my-module
And when importing:

import my_module