以下几种方法来模拟enum：（感觉方法一简单实用）

复制代码 代码如下:

way1

class Directions:
up = 0
down = 1
left = 2
right =3

print Directions.down

way2

dirUp, dirDown, dirLeft, dirRight = range(4)

print dirDown

way3

import collections
dircoll=collections.namedtuple('directions', ('UP', 'DOWN', 'LEFT', 'RIGHT'))
directions=dircoll(0,1,2,3)

print directions.DOWN

way4

def enum(args, start=0):
class Enum(object):
slots = args.split()

    def __init__(self):  
        for i, key in enumerate(Enum.__slots__, start):  
            setattr(self, key, i)

return Enum()

e_dir = enum('up down left right')

print e_dir.down

way5

some times we need use enum value as string

Directions = {'up':'up','down':'down','left':'left', 'right':'right'}

print Directions['down']