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from collections.abc import Mapping

# ------------------------------------------
# ----SUBCLASSING dict WILL NOT GIVE YOU----
# -----ACCESS TO ITS INTERNAL C METHODS-----
# ------------------------------------------
#
# class DrownsMap(dict):
# 
#     def __getitem__(self, key):
#         if key == 'ghost':
#             return 'Boo!'
#         return super().__getitem__(key)
# 
#     def boo(self, key):
#         if key == "Ghost":
#             return 'Boo!'
#         else:
#             return None


class DrownsMap(Mapping):
    def __init__(self, *args, **kwargs):
        self._storage = dict(*args, **kwargs)

    def __getitem__(self, key):
        if key == 'ghost':
            return 'Boo!'
        return self._storage[key]

    def __iter__(self):
        return iter(self._storage)

    def __len__(self):
        return len(self._storage)


custom_mapping = DrownsMap(one=1, two=2, three=3)

print(custom_mapping['one'])
print(custom_mapping['two'])
print(custom_mapping['three'])
print(custom_mapping.get("ghost"))
print(custom_mapping['ghost'])