from abc import abstractmethod
from collections.abc import Container, Sized, Iterable, Iterator
from collections.abc import Sequence, Mapping, Set
from collections.abc import MutableSequence, MutableMapping, MutableSet
from collections.abc import MappingView, ItemsView, KeysView, ValuesView
from collections.abc import Callable, Hashable
class UserSet(Container, Sized):
# 对应len()方法
def __len__(self) -> int:
return len(self.items)
# 对应in关键字
def __contains__(self, x: object) -> bool:
return x in self.items
def __init__(self):
self.items = set()
def append(self, item):
self.items.add(item)
class UserList(Iterable):
def __init__(self):
self.items = [1, 2, 3, 4, 5, 6]
self.index = 0
# 和__iter__一起实现for in语法
def __next__(self):
if self.index < len(self.items) - 1:
self.index = self.index + 1
return self.items[self.index]
else:
raise StopIteration
def __iter__(self):
return self
class UserSeq(Sequence):
def __init__(self):
self.data = list()
self.data.append(1)
self.data.append(2)
def __len__(self) -> int:
return len(self.data)
# 实现分片取数[]能力
def __getitem__(self, i: int):
return self.data[i]
class UserMap(Mapping):
def __len__(self) -> int:
return len(self.data)
def __iter__(self):
return self
def __init__(self):
self.data = dict()
self.data['a'] = 1
self.data['b'] = 2
# 实现v=data[k]取数语法
def __getitem__(self, k):
return self.data[k]
# 实现data[k]=赋值语法
def __setitem__(self, key, value):
self.data[key] = value
class UserSet2(Set):
def __init__(self):
self.data = set()
self.data.add(6)
self.data.add(7)
def __contains__(self, x: object) -> bool:
return x in self.data
def __len__(self) -> int:
return len(self.data)
def __iter__(self):
return self
if __name__ == '__main__':
u = UserSet()
u.append("u1")
print("u1" in u)
print(len(u))
u2 = UserList()
for i in u2:
print(i)
u3 = UserSeq()
print(u3[1])
u4 = UserMap()
u4['c'] = 3
print(u4['a'])
u5 = UserSet2()
print(9 in u5)