[issue20539] math.factorial may throw OverflowError

[Mark Dickinson]

Mark Dickinson added the comment:

> Some others Python functions like str * int raises a MemoryError on overflow.

I have to say that that's always seemed wrong to me: IMO MemoryError should only be raised when we've really run out of memory, or perhaps where the amount of memory we're about to need exceeds all possible limits (e.g., more than 2**63 bytes on a 64-bit system).

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<http://bugs.python.org/issue20539>
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