Python tips 31[python using enum][]

The following methods are used to simulate an enum: (Sensory method is simple and practical)

# 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 ', ' off ', ' 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-left-right ')

Print E_dir.down

# Way5
# Some times we need use enum value as String
Directions = {' Up ': ' Up ', ' off ': ' Down ', ' left ': ' Left ', ' right ': ' Right '}

Print directions[' down ']

Problem: Sometimes it is necessary to use the value of enum as a string, as indicated in Way5, do you have a better way?

Reference: http://audbel.com/0/5009691

Http://www.cnblogs.com/itech/archive/2011/03/08/1977245.html

Python tips 31[python using enum][]