s.isalnum() True, if the string is entirely composed of alphabetic and/or numeric characters
s.isalpha() True, if all characters in s are alphabetic
s.isdigit() True, if all character in s are digits
s.islower() True, if all character in s are lower case letters
s.isupper() True, if all character in s are upper case letters
s.isspace() True, if all characters in s are whitespaces
s.istitle() True, if all words in s are capitalized