Pure Python implementation of an enumerated type

enum.py

def enum(*sequential, **named):
    enums = dict(zip(sequential, range(len(sequential))), **named)
    reverse = dict((value, key) for key, value in enums.iteritems())
    enums['reverse_mapping'] = reverse
    return type('Enum', (), enums)
    
def example():
    Numbers = enum(ONE=1, TWO=2, THREE='three')
    print Numbers.ONE
    print Numbers.THREE
    print Numbers.reverse_mapping['three']

if (__name__ == '__main__'):
    example()