Ethan Furman added the comment:
The further from dict it goes, the more there is to remember. Considering the
work around is so simple, I just don't think it's worth it:
for key in list(ordered_dict):
if some_condition:
del ordered_dict[key]
A simple list around the dict and we're good to go; and this trick works with
dicts, defaultdicts, sets, lists (when you don't want the skipping behavior),
etc.
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<http://bugs.python.org/issue19414>
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