find(), rfind(), index(), rindex(); can also use the in operator.
2.
Identifiers
import string alphas = string.letters + '_' alnums = alphas + string.digits iden = raw_input('Identifier to check? ') if len(iden) > 0: if iden[0] not in alphas: print "Error: first char must be alphabetic" else:if len(iden) > 1: for eachChar in iden[1:]: if eachChar not in alnums: print "Error: others must be alnum" break else: import keyword if iden not in keyword.kwlist: print 'ok' else: print 'Error: keyword name' else: print 'Error: no identifier entered'