> 2013/10/8 John Cremona <john.c...@gmail.com <javascript:>> > >> Now a mathematician would argue that the last one should raise some >> kind of error since we are apparently asking for the equality of >> objects in incomparable domains. But Python requires (I believe) that >> == should always return True or False, so that is not an option. >> > > I can't find such a restriction here: > > http://docs.python.org/3/reference/datamodel.html#object.__eq__ > > Returning any value (explicitly including NotImplemented) is allowed, > nothing is said about raising exceptions. > > It is a convention that the rich comparisons (and "in") should never raise an (uncaught) exception.
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