Python: ModuleNotFoundError : I am a beginner and learning Python. I have setup the environment with SublimeText and Python3.x

I am fine in creating code on Sublime and building it locally through Ctrl+B and for input() function I installed SublimeREPL and it works find up till now.

The issue I am facing is on Python interpreter. I am facing below error while import any package:

>>> import tweepy
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'tweepy'


I cannot even run Python script from there. My Python path is below:

C:\Users\waqas.FVC\AppData\Local\Programs\Python\Python37-32

Demo.py and hello.py are the two scripts I wrote initially which I am trying to execute from Python Terminal but it is showing below error:

>>> test.py
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'test' is not defined
>>> Demo.py
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'Demo' is not defined

Please help