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19 lines
407 B
Python
19 lines
407 B
Python
class uniquestr(str):
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_lower = None
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def __hash__(self):
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return id(self)
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def __eq__(self, other):
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return self is other
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def lower(self):
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if self._lower is None:
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lower = str.lower(self)
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if str.__eq__(lower, self):
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self._lower = self
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else:
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self._lower = uniquestr(lower)
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return self._lower
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