Python Enum 枚舉 用法匯總

 1 import os
 2 import sys
 3 if sys.version_info.major + sys.version_info.minor * 0.1 < 3.4:
 4     from enum34 import Enum
 5 else:
 6     from enum import Enum
 7     
 8 class MyColorEnum(Enum):
 9     red = 1
10     red_alias = 1
11     blue = 2
12     green = ‘green‘
13     
14
 
 MyColorEnum.red.name    # get member name string
15 MyColorEnum.red.value   # get member value
16 
17 for c in MyColorEnum:
18     print(c)    # just one of MyColorEnum.red_alias and MyColorEnum.red, according to the order which itself decides
19 
20 for c in MyColorEnum.__members__.items():
21     c[0]    #
 
 str name eg. ‘red‘
22     c[1]    # member eg. MyColorEnum.red
23     # contain ‘red_alias‘ and MyColorEnum.red_alias
24     
25 ‘red‘ in MyColorEnum.__members__    # if member name in Enum
26 0 in MyColorEnum._value2member_map_ # if value in Enum values
27 
28 MyColorEnum.__members__[‘red‘]  # MyColorEnum.red, get member by member name string, if no such member name string, raising KeyError
 

29 
30 # comparation ################################################################################
31 MyColorEnum.red is MyColorEnum.red_alias    # True
32 MyColorEnum.red == MyColorEnum.red_alias    # True
33 MyColorEnum.red != MyColorEnum.red_alias    # False
34 #never do this
35 #MyColorEnum.red < MyColorEnum.blue  # raising TypeError, Enum values could be different types

Python Enum 枚舉 用法匯總