How to install Telethon?

[Sharon]

Hi guys, please be kind because I feel dumb. It's my first day using Python and I'm trying to install Telethon.

This machine is an old WIN7 and I just installed the last Python version (3.7.3) then I opened the Python shell and tried the following:

Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 21:26:53) [MSC v.1916 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license()" for more information.
>>> pip3 install telethon
SyntaxError: invalid syntax
>>> help
Type help() for interactive help, or help(object) for help about object.
>>> python pip install telethon
SyntaxError: invalid syntax
>>> install telethon
SyntaxError: invalid syntax
>>>