venture of iit bombay vjti alumni so and false otherwise expandtabs(tabsize= expands tabs in string to multiple spacesdefaults to spaces per tab if tabsize not provided find(strbeg= end=len(string)determine if str occurs in string or in substring of string if starting index beg and ending index end are given returns index if found and - otherwise index(strbeg= end=len(string)same as find()but raises an exception if str not found isalnum(returns true if string has at least character and all characters are alphanumeric and false otherwise