import bpy ModuleNotFoundError: No module named 'bpy'

[MahendraDhaker]

Trying to reduce polygon obj file . i am working on windows . i have installed blender but still not able to import bpy module.

C:\Users\demok\PycharmProjects\pythonProject\venv\Scripts\python.exe C:/Users/demok/PycharmProjects/pythonProject/BlenderPythonDecimator-master/blenderSimplify.py
Traceback (most recent call last):
File "C:\Users\demok\PycharmProjects\pythonProject\BlenderPythonDecimator-master\blenderSimplify.py", line 4, in
import bpy
ModuleNotFoundError: No module named 'bpy'

Process finished with exit code 1