Message 256572 - Python tracker

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In-reply-to
Author	curioswati
Recipients	abarnert, abarry, curioswati, rhettinger
Date	2015年12月17日.03:15:37
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1450322138.83.0.0383321825059.issue25864@psf.upfronthosting.co.za>

Content
But the work around suggested here as: def __reversed__(self): return (self[k] for k in reversed(range(len(self)))) is also not a general solution, i.e. it is applicable for the following case: m = MyDict({2:40, 0:10, 1:20}) but for any other mapping which does not have 0 as a key, it results in KeyError. So another solution, which would be more general could be: def __reversed__(self): keys = [k for k in self.keys()] return (self[k] for k in reversed(keys))

Content

But the work around suggested here as:
def __reversed__(self):
 return (self[k] for k in reversed(range(len(self))))
is also not a general solution, i.e. it is applicable for the following case:
 m = MyDict({2:40, 0:10, 1:20})
but for any other mapping which does not have 0 as a key, it results in KeyError. So another solution, which would be more general could be:
def __reversed__(self):
 keys = [k for k in self.keys()]
 return (self[k] for k in reversed(keys))

History
Date	User	Action	Args
2015年12月17日 03:15:38	curioswati	set	recipients: + curioswati, rhettinger, abarnert, abarry
2015年12月17日 03:15:38	curioswati	set	messageid: <1450322138.83.0.0383321825059.issue25864@psf.upfronthosting.co.za>
2015年12月17日 03:15:38	curioswati	link	issue25864 messages
2015年12月17日 03:15:38	curioswati	create

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