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@@ -2,15 +2,13 @@ class set:
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def __init__(self, iterable=None):
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iterable = iterable or []
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self._a = {}
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- for item in iterable:
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- self.add(item)
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+ self.update(iterable)
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def add(self, elem):
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self._a[elem] = None
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def discard(self, elem):
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- if elem in self._a:
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- del self._a[elem]
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+ self._a.pop(elem, None)
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def remove(self, elem):
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del self._a[elem]
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@@ -18,10 +16,9 @@ class set:
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def clear(self):
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self._a.clear()
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- def update(self,other):
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+ def update(self, other):
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for elem in other:
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self.add(elem)
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- return self
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def __len__(self):
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return len(self._a)
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@@ -37,19 +34,13 @@ class set:
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def __or__(self, other):
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ret = self.copy()
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- for elem in other:
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- ret.add(elem)
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+ ret.update(other)
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return ret
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def __xor__(self, other):
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- ret = set()
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- for elem in self:
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- if elem not in other:
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- ret.add(elem)
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- for elem in other:
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- if elem not in self:
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- ret.add(elem)
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- return ret
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+ _0 = self - other
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+ _1 = other - self
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+ return _0 | _1
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def union(self, other):
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return self | other
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blueloveTH