[issue20539] math.factorial may throw OverflowError

[Mark Dickinson]

Mark Dickinson added the comment:

What behaviour would you suggest instead?

Apart from the time, the result would have over 10**20 digits, so would need exabytes of memory to represent.

>>> from math import lgamma, log
>>> lgamma(1e19) / log(10)
1.8565705518096748e+20

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nosy: +mark.dickinson

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