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The default argument in dict.setdefault() defaults to None.
Add this default to UserDict.DictMixin.setdefault() too.
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08678a1055
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@ -113,7 +113,7 @@ def items(self):
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def clear(self):
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for key in self.keys():
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del self[key]
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def setdefault(self, key, default):
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def setdefault(self, key, default=None):
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try:
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return self[key]
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except KeyError:
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