test-变量.py

#!/usr/bin/python
import string


alphas = string.letters + '_'
nums = string.digits


print 'Welcome to the Identifier Checker v1.0'
print 'Testees must be at least 2 chars long.'
myInput = raw_input('Identifier to test?')


if len(myInput) > 1:
        if myInput[0] not in alphas:
                print '''invalid: first symbol must be 
alphabetic'''
        else:
                for otherChar in myInput[1:]:
                        if otherChar not in alphas + nums:
                                print '''invalid: remaining
symbols must be alphanumeric'''
                                break
                        else:
                                print "okay as an identifier"