Antoine Pitrou <pit...@free.fr> added the comment:

No wonder it's quadratic (rather than exponential), since summing will
invoke the + operator and therefore produce a new list object at every
iteration.
If you use "f = f + l" in your explicit version, it becomes quadratic too.

----------
nosy: +pitrou
resolution:  -> invalid
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue5855>
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