[issue19423] permutations len issue

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

permutations() returns a generator.
If you consume it with list(), the second time will return the empty list.

Use list(permutations(...)) if you plan to use the result multiple times.

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nosy: +amaury.forgeotdarc
resolution:  -> invalid
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19423>
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