Cyker Way <cyker...@gmail.com> added the comment:
Alright that helps. I guess I now understand what's happening here. Here are
the two numbers in question:
>>> M = int('1'*53+'0'*971, 2)
>>> N = int('1'*53+'0'+'1'*970, 2)
M is the largest number in binary64 range, while N is the largest number that
does not emit an OverflowError when converted to binary64. N+1 will emit that
error. N-M == 2**970-1 which means N is larger than M that caused the confusion.
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46173>
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