python技巧31[python中使用enum][转]
以下几种方法来模拟enum:(感觉方法一简单实用)
# 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']
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']
问题:有的时候需要使用enum的值作为字符串使用,像way5中表示的,大家有没有更好的办法?
参考:http://audbel.com/0/5009691
http://www.cnblogs.com/itech/archive/2011/03/08/1977245.html
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