Python !=和is not运算符的区别

!=运算符检查被比较的两个对象的值是否相同。另一方面，”is not”运算符检查被比较的两个对象是否不指向同一个引用。如果被比较的对象不指向同一个引用，”is not”运算符返回true，否则返回false。本文将讨论如何使用!=和”is not”运算符以及它们之间的区别。

!= 运算符	“is not”运算符
!= 运算符仅比较正在比较的对象的值。	“is not”运算符比较对象是否指向相同的内存位置。
如果两个对象的值不同，则返回 True，否则返回 False。	如果对象没有指向相同的内存位置，则返回 true，否则返回 false。
!= 运算符的语法是 object1 != object2	“is not”运算符的语法是 object1 is not object2

示例

在下面的示例中，我们使用!=运算符和 “is not” 运算符来比较不同数据类型的两个对象值，比如整数、字符串和列表，以查看这两个运算符之间的差异。

# python code to differentiate between != and ‚Äúis not‚Äù operator.

# comparing object with integer datatype
a = 10
b = 10
print("comparison with != operator",a != b)
print("comparison with is not operator ", a is not b)
print(id(a), id(b))

# comparing objects with string data type
c = "Python"
d = "Python"
print("comparison with != operator",c != d)
print("comparison with is not operator", c is not d)
print(id(c), id(d))

# comparing list
e = [ 1, 2, 3, 4]
f=[ 1, 2, 3, 4]
print("comparison with != operator",e != f)
print("comparison with is not operator", e is not f)
print(id(e), id(f))

输出

comparison with != operator False
comparison with is not operator  False
139927053992464 139927053992464
comparison with != operator False
comparison with is not operator False
139927052823408 139927052823408
comparison with != operator False
comparison with is not operator True
139927054711552 139927052867136