Built-in String Functions with Example, Part 6, in Tamil, Chapter 8, Unit 2, A.Jaya Mabel Rani/AP.
len(), capialize(), center(), find(), isalnum(), isalpha(), isdigit(), lower(), islower(), isupper(), title(), swapcase(), count(), ord(),chr() - example, STRINGS AND STRING MANIPULATION, 12th Standard Computer Science, Based on New Syllabus, Tamil Nadu State Board.