Python Basics: Strings and String Methods (Summary) – Real Python

Introduction to Python Strings

31 essential String methods in Python you should know - Python Engineer

Python: Find Average of List or List of Lists • datagy

Python: Check wheather three given lengths of three sides form a right triangle - w3resource

How to Find Length of List in Python

How To Substring In Python

Python: Find an Index (or all) of a Substring in a String • datagy

JavaScript Substring Examples - Slice, Substr, and Substring Methods in JS