Stephen Webber added the comment:
Hmm, that is odd behavior indeed.
I think having keys that point to zero values is important for iterating over a
set. For example:
>>> x = Counter(a=10, b=0)
>>> for k in set(x):
... x[k] += 1
...
>>> x
Counter({'a': 11, 'b': 1})
is probably preferable to
>>> x = Counter(a=10, b=0)
>>> for k in set(x):
... x[k] += 1
...
>>> x
Counter({'a': 11})
Perhaps to ensure intuitive behavior we could ensure that
>>> Counter(a = 3) + Counter(b = 0) == Counter(a = 3, b = 0)
True
by aggregating all keys into the new Counter object, even those with zero
values? I would be happy to make such a patch, as it would be good experience
for me to learn. Would this be an acceptable solution, and is there other odd
behavior at work here?
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14182>
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