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add __sub__ #3

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add __sub__ #3

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7 changes: 7 additions & 0 deletions cdict/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -78,6 +78,13 @@ def apply_fn(x: Any) -> Any:
def __add__(self, other: cdict_base) -> cdict_base:
return cdict_iter([self, other])

def __sub__(self, other: cdict_base) -> cdict_base:
def hashify(x: dict) -> tuple:
return tuple(sorted(x.items()))

other_set = set((hashify(x) for x in other))
return self.filter(lambda x: hashify(x) not in other_set)

def __mul__(self, other: cdict_base) -> cdict_base:
if not isinstance(other, cdict_base):
return NotImplemented
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