python身份运算符

Identity operators are used to perform the comparison operation on the objects i.e. these operators check whether both operands refer to the same objects (with the same memory location) or not.

身份运算符用于对对象执行比较操作，即这些运算符检查两个操作数是否引用相同的对象(具有相同的存储位置)。

Following are the identity operators,

以下是身份运算符，

Operator	Descriptions	Example
is	It returns True if both operands refer to the same objects; False, otherwise.	x is y
is not	It returns True if both operands do not refer to the same objects; False, otherwise.	x is not y

操作员	内容描述	例
是	如果两个操作数都引用相同的对象，则返回True。 错误，否则。	x是y
不是	如果两个操作数都不引用相同的对象，则返回True；否则，返回True。 错误，否则。	x不是y

Syntax:

句法：

    operand1 is operand2
operand1 is not operand2

Python“是”运算符示例 (Python 'is' operator example)

# Python program to demonstrate the 
# example of identity operators
x = [10, 20, 30]
y = [10, 20, 30]
z = x
# Comparing the values using == operator
print("x == y: ", x == y)
print("y == z: ", y == z)
print("z == x: ", z == x)
print()
# Comparing the objects 
# whether they are referring 
# the same objects or not
print("x is y: ", x is y)
print("y is z: ", y is z)
print("z is x: ", z is x)
print()

Output:

输出：

x == y:  True
y == z:  True
z == x:  True
x is y:  False
y is z:  False
z is x:  True

Python“不是”运算符示例 (Python 'is not' operator example)

# Python program to demonstrate the 
# example of identity operators
x = [10, 20, 30]
y = [10, 20, 30]
z = x
# Comparing the values 
# using != operator
print("x != y: ", x != y)
print("y != z: ", y != z)
print("z != x: ", z != x)
print()
# Comparing the objects 
# whether they are referring 
# the same objects or not
print("x is not y: ", x is not y)
print("y is not z: ", y is not z)
print("z is not x: ", z is not x)
print()

Output:

输出：

x != y:  False
y != z:  False
z != x:  False
x is not y:  True
y is not z:  True
z is not x:  False

翻译自: https://www.includehelp.com/python/identity-operators.aspx

python身份运算符