title: Difference between http:client and Requests
body: <p>In Postman, while I want to change my code from 'curl" to "python", there are two options, one is called "http.client(python3)", and the other one is called requests. 
  I'm trying to write a script to call Restful api in python, and i use pycharm to try both of the options. The first one doesn't work and the second one works, and i can successfully get access_token.
  Could someone explain whats the difference between the two, and I'm new to python btw.</p>