python中== 和 is 的区别

== 和 is 的区别

x = y = [1, 2, 3]
z = [1, 2, 3]
print(x == y)   # True
print(x == z)   # True
print(x is y)   # True
print(x is z)   # False
 
print(id(x))    # 4416785008
print(id(y))    # 4416785008
print(id(z))    # 4416784504

x，y，z三个对象的值都是[1,2,3]，所以在==的情况下都是True

x和y的id相同，所以x is y 为 True，而x和z的id不同，所以x is z 为 False