STINNER Victor added the comment:
Oh, NaN can be signed?
>>> struct.pack("d", float("nan"))
b'\x00\x00\x00\x00\x00\x00\xf8\x7f'
>>> struct.pack("d", float("-nan"))
b'\x00\x00\x00\x00\x00\x00\xf8\xff'
>>> struct.pack("d", -float("nan"))
b'\x00\x00\x00\x00\x00\x00\xf8\xff'
>>> struct.pack("d", -float("-nan"))
b'\x00\x00\x00\x00\x00\x00\xf8\x7f'
Why does Python return the same representation for positive and negative NaN?
>>> float("nan")
nan
>>> float("-nan")
nan
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23185>
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