Python中有枚举类型吗?
python中没有enum枚举类型,可能python认为这玩意压根就没用,下面列举了三种方法模拟enum枚举类型
方法1. 使用自定义类
class Numbers(object):ONE = 1
TWO = 2
THREE = 3
assert Numbers.ONE == 1
assert Numbers.TWO == 2
assert Numbers.THREE == 3
方法2:使用函数动态创建类
def enum(**enums):return type('Enum', (object,), enums)
Numbers = enum(ONE=1, TWO=2, THREE=3)
assert Numbers.ONE == 1
assert Numbers.TWO == 2
assert Numbers.THREE == 3
方法3:创建一个从python的集合扩展来的对象
class Enum(set):def __getattr__(self, name):
if name in self:
return name
raise AttributeError
Numbers = Enum( "ONE TWO THREE".split() )
error = False
try:
print Numbers.ONE
print Numbers.TWO
print Numbers.THREE
except:
error = True
assert error == False
try:
print Numbers.FOUR
except:
error = True
assert error == True
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