If you are running 32-bit 3.6 on Windows, please test this

[Serhiy Storchaka]

31.08.17 08:13, Steven D'Aprano пише:
> As far as I can see, apart from tests for NAN and ±INF, there are no
> tests of math.sqrt on floats at all.

See test_testfile in test_math.py.