Serhiy Storchaka added the comment:
The advantage of dict.setdefault() is its atomicity. With lazy evaluation of
the value it can't be atomic anymore, and can be replaced with the following
code:
if key not in mydict:
mydict[key] = value
I'm -1 for this change. It increases complexity (both semantical and
implementational) of dict.setdefault() and doesn't have significant benefit.
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nosy: +rhettinger, serhiy.storchaka
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<http://bugs.python.org/issue31240>
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