What is the maximum possible value of an integer in Python? - GfG
Byte Objects vs String in Python - GfG
Python Input Methods for Competitive Programming - GfG
Various methods of collections - Comprehensive Python Cheatsheet
a += b is not always a = a + b - GfG
Should you put init.py file in every package’s folder? - Good practice to just put it, but its not really required for Python 3.3+ (after introduction of Implicit Namespace Packages)