python集合魔术函数有哪些

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)