关于python判断参数是否是合法标识符介绍

import string

def is_valid_identifier(param):
    alphas = string.letters + '_'
    nums = string.digits

    if len(param) > 1:
        if param[0] not in alphas:
            print 'invalid:first symbol must be alphabetic'
        else:
            for otherChar in param[1:]:
                if otherChar not in alphas + nums:
                    print 'invalid:reminding symbols must be alphanumeric'
                    break
            else:
                 print 'okay, %s is an valid identifier'%param


is_valid_identifier('class')

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