Importing library into python

As @Haynesss commented, PyCharm indicates every time a variable or even an import is not used. This is good practice.

Anyway, as a bonus, it's always interesting to define which python interpreter you're using in PyCharm.

Take a look at in the PyCharm documentation for the python interpreter configuration . It's English, but it's a starting point.

When the import goes gray, it is because you are not using it.

What I suspect you are doing is the following:

import time
sleep(2)

This does not work because you're only importing the name time . To use the library, you need to access its functions like this:

import time
time.sleep(2)

Or, importing all module names, as follows:

from time import *
sleep(2)