python集合魔法函数有哪些

class TestContainer:

    def __init__(self):

        self.my_list = []

        self.my_dict = {}

    def __len__(self):

        return len(self.my_list)

    def append(self, v):

        self.my_list.append(v)

    def __getitem__(self, item):

        return self.my_dict.get(item)

    def __setitem__(self, key, value):

        self.my_dict[key] = value

    def __delitem__(self, key):

        del self.my_dict[key]

    def __contains__(self, item):

        return True if item in self.my_list else False

testContainer = TestContainer()

testContainer.append(1)

print(len(testContainer))

testContainer["name"] = "xiaoming"

print(testContainer["name"])

del testContainer["name"]

print(testContainer["name"])

print(1 in testContainer)