==、is

In [1]: a = [11,22,33]

In [2]: b = a

In [3]: a == b
Out[3]: True

In [4]: a is b
Out[4]: True


In [6]: import copy
In [7]: c = copy.deepcopy(a)

In [8]: a == c
Out[8]: True

In [9]: a is c
Out[9]: False

总结

• is 是比较两个引用是否指向了同一个对象（引用比较）。
• == 是比较两个对象是否相等。