On Mon, Nov 23, 2020 at 04:26:20PM -0500, Wes Turner wrote: > Is there a different IEEE spec or CAS that distinguishes between 1/x and > 2/x where x=0?
No. x/0.0 would either signal an error (in Python terms: raise an exception) or return a NAN. The specific NAN it might return is not set by the IEEE-754 standard. Although IEEE-754 allows NANs to transmit debugging information in the form of the NAN payload, it doesn't mandate it, and few maths libraries do so. So in principle 1/0.0 and 2/0.0 could return two NANs with different payloads, but it's not required. > assert 1/0 != 2/0 != math.inf/0 Since NANs always compare unequal with each other, regardless of the payload, that assertion would always pass even if the NANs were the same NAN. -- Steve _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/72DKIMFQILFIMER3IZCBGELA2ZWZCQS6/ Code of Conduct: http://python.org/psf/codeofconduct/
