Most Useful Python String Functions — TutorialBrain
Best Post Immutable String,string Operations Python-2 - ITVoyagers
Strings and Character Data in Python – Real Python
String Operators in Python | Examples of String Operators in Python
Built-in String functions - Python
String Operators in Python | Examples of String Operators in Python
python tutorial - Python String | How to check if a string is a valid keyword in Python - By Microsoft Award MVP - learn python - python programming - Learn in 30sec | wikitechy