Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

> when I moved to testing on non-trivial graphs, I immediately had 
> Out of Memory Errors.

I'm going to hazard a guess that the input to product() was a graph traversal 
iterator that got trapped in an undetected cycle.  Feeding an infinite iterator 
into product() would eat all available memory, just as it would with list().

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40230>
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