venture of iit bombay vjti alumni isalpha(returns true if string has at least character and all characters are alphabetic and false otherwise isdigit(returns true if string contains only digits and false otherwise islower(returns true if string has at least cased character and all cased characters are in lowercase and false otherwise isnumeric(returns true if unicode string contains only numeric characters and false otherwise isspace(returns true if string contains only whitespace characters and false otherwise