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def alphanumeric(string):

if len(filter(lambda x:x.isdigit(),list(string)))>0:

return True

elif string == 'a'or string == 'an':

return True

else:

return False

#####最佳实践

# An obvious, elegant solution is just to return string.isalnum()

# But I feel like this kata is broken. The description says something about a buggy regular expression.

# I don't know what regular expression it's referring to, but to try to solve this in the spirit of

# the kata, I'm going to use a regular expression.

import re

pattern = re.compile('^[0-9a-zA-Z]+$')

def alphanumeric(string):

return pattern.match(string) is not None