[Python-Dev] PEP 495 accepted

[Guido van Rossum]

On Tue, Sep 22, 2015 at 8:16 AM, Tim Peters <tim.peters at gmail.com> wrote:

> [Tim]
> > ...
> > The
> > top-level operation on the RHS is datetime.fromtimestamp().  However,
> > it didn't pass a tzinfo, so it creates a naive datetime.  Assuming dt
> > was aware to begin with, the attempt to compare will always (gap or
> > not) raise an exception.
>
> Oops!  In current Python, comparing naive and aware via `==` just
> returns False.  That's even more confusing ;-)
>

Hm, but that's in general how == is *supposed* to work between objects of
incompatible types. < and > are supposed to fail but == is supposed to
return False (the __eq__ should return NotImplemented). If == ever raises
an exception, having two different objects as dict keys can cause random,
hard-to-debug failures.

-- 
--Guido van Rossum (python.org/~guido)
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