Don't understand these ModuleNotFound errors - python

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 a 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 errors:
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

The initial Python download includes a number of libraries, but there are many, many more that must be downloaded and installed separately. Tweepy is among those libraries.
You can find, and download, tweepy from here:
https://pypi.org/project/tweepy/

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(lldb) script
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Terminal output
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Traceback (most recent call last):
File "<input>", line 1, in <module>
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I am running python 2.7 and matlab2015a from a virtual environment. Both matlab and python are properly in the path (I can start them from terminal). But, whenever I do this:
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File "<stdin>", line 1, in <module>
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