enumerate overflow

Hrvoje Niksic hniksic at xemacs.org
Wed Oct 3 21:08:41 CEST 2007

Raymond Hettinger <python at rcn.com> writes:

> [Paul Rubin]
>> I hope in 3.0 there's a real fix, i.e. the count should promote to
>> long.
> In Py2.6, I will mostly likely put in an automatic promotion to long
> for both enumerate() and count().  It took a while to figure-out how
> to do this without killing the performance for normal cases (ones
> used in real programs, not examples contrived to say, "omg, see what
> *could* happen").

Using PY_LONG_LONG for the counter, and PyLong_FromLongLong to create
the Python number should work well for huge sequences without
(visibly) slowing down the normal case.

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