Python 中的枚举
Python 中的枚举是使用名为“枚举的模块实现的。枚举使用类创建。枚举有名称和与之相关的值。 枚举属性: 1。枚举可以显示为字符串或 repr 。 2。可以使用 type() 检查枚举的类型。 T22】3。”name关键字用于显示枚举成员的名称。
计算机编程语言
# Python code to demonstrate enumerations
# importing enum for enumerations
import enum
# creating enumerations using class
class Animal(enum.Enum):
dog = 1
cat = 2
lion = 3
# printing enum member as string
print ("The string representation of enum member is : ",end="")
print (Animal.dog)
# printing enum member as repr
print ("The repr representation of enum member is : ",end="")
print (repr(Animal.dog))
# printing the type of enum member using type()
print ("The type of enum member is : ",end ="")
print (type(Animal.dog))
# printing name of enum member using "name" keyword
print ("The name of enum member is : ",end ="")
print (Animal.dog.name)
输出:
The string representation of enum member is : Animal.dog
The repr representation of enum member is : <Animal.dog: 1>
The type of enum member is : <enum 'Animal'>
The name of enum member is : dog
4。枚举是可迭代的。它们可以使用循环 5 进行迭代。枚举支持哈希。枚举可用于词典或集合。
计算机编程语言
# Python code to demonstrate enumerations
# iterations and hashing
# importing enum for enumerations
import enum
# creating enumerations using class
class Animal(enum.Enum):
dog = 1
cat = 2
lion = 3
# printing all enum members using loop
print ("All the enum values are : ")
for Anim in (Animal):
print(Anim)
# Hashing enum member as dictionary
di = {}
di[Animal.dog] = 'bark'
di[Animal.lion] = 'roar'
# checking if enum values are hashed successfully
if di=={Animal.dog : 'bark',Animal.lion : 'roar'}:
print ("Enum is hashed")
else: print ("Enum is not hashed")
输出:
All the enum values are :
Animal.dog
Animal.cat
Animal.lion
Enum is hashed
访问模式:枚举成员有两种访问方式 1。通过值 :-在这个方法中，枚举成员的值被传递。 2。通过名称 :-在这个方法中，枚举成员的名称被传递。 单独的值或名称也可以使用“名称”或“值关键字访问。 比较:枚举支持两种类型的比较 1。身份 :-这些是用关键字是、不是检查的。 2。相等 :-相等比较“ == ”和“！= "也支持类型。
计算机编程语言
# Python code to demonstrate enumerations
# Access and comparison
# importing enum for enumerations
import enum
# creating enumerations using class
class Animal(enum.Enum):
dog = 1
cat = 2
lion = 3
# Accessing enum member using value
print ("The enum member associated with value 2 is : ",end="")
print (Animal(2))
# Accessing enum member using name
print ("The enum member associated with name lion is : ",end="")
print (Animal['lion'])
# Assigning enum member
mem = Animal.dog
# Displaying value
print ("The value associated with dog is : ",end="")
print (mem.value)
# Displaying name
print ("The name associated with dog is : ",end="")
print (mem.name)
# Comparison using "is"
if Animal.dog is Animal.cat:
print ("Dog and cat are same animals")
else : print ("Dog and cat are different animals")
# Comparison using "!="
if Animal.lion != Animal.cat:
print ("Lions and cat are different")
else : print ("Lions and cat are same")
输出:
The enum member associated with value 2 is : Animal.cat
The enum member associated with name lion is : Animal.lion
The value associated with dog is : 1
The name associated with dog is : dog
Dog and cat are different animals
Lions and cat are different
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