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class DictProtocol:

def __init__(self):

self.real_data = {}

def __getitem__(self, item):

return self.real_data[item]

def __setitem__(self, key, value):

self.real_data[key] = value

def __contains__(self, item):

return item in self.real_data

if __name__ == "__main__":

dp = DictProtocol()

dp["a"] = 100

dp["b"] = 200

print(dp["a"])

print(dp["b"])

print("a" in dp)