#!/usr/bin/env python

from keyword import kwlist

import string

ALPHAS = string.ascii_letters + '_'

NUMS = string.digits

def main():

print 'Welcome to the Identifier Checker v2.0'

myInput = raw_input('Identifier to test? ').strip()

if len(myInput) == 0:

print "ERROR: no identifier candidate entered"

return

if myInput in kwlist:

print "ERROR: %r is a keyword" % myInput

return

alnums = ALPHAS + NUMS

for i, c in enumerate(myInput):

if i == 0 and c not in ALPHAS:

print 'ERROR: first symbol must be alphabetic'

break

if c not in alnums:

print 'ERROR: remaining symbols must be alphanumeric'

break

else:

print "okay as an identifier"

if __name__ == '__main__':

main()