Q:

Pycharm - cannot import math module

I have a problem because i can't import math module in pycharm and I need arctan2 function, from IDLE console I can do it and use functions. 
When I go to the File/Settings/Project Interpreter section, I have that list:

When I want to add math package, I cannot found it

I reinstalled pycharm, and that didn't work for me 
pycharm version: 2017.2.3
python version: 3.6.2
What can cause that? What other libraries contain trigonometry functions like arctan2?

A:

The solution that seemed to work for you:
Choose the same python.exe for PyCharm as it's registered in your PYTHONPATHvariable. If it is not listed, you can add it manually in Settings -> Python Interpreter

