I am using python but I want to know what are the modules in python and how to download those things?

Answer 1

you find modules here
https://pypi.python.org/pypi
here you find how to download modules.
In most cases it is pip install <module>
As far as I remember, curses is a bit tricky.

Answer 2

Modules in Python use to do some special work in our programming. A Python module is simply a  Pythonsource file, which can expose classes, functions and global variables. When imported from another Python source file, the file name is treated as a namespace. A Python package is simply a directory of Python module(s).