On 22/02/2014 21:26, Tim Delaney wrote:

On 23 February 2014 02:29, Nick Coghlan <[email protected] <mailto:[email protected]>> wrote:

    On 22 Feb 2014 22:15, "Stephen J. Turnbull" <[email protected]
    <mailto:[email protected]>> wrote:
    > Antoine Pitrou writes:
    >  > Chris Angelico <[email protected] <mailto:[email protected]>>
    wrote:
    >  > > hasattr(x,"y") <-> (x.y or True except AttributeError: False)
    >  > But it's not the same. hasattr() returns a boolean, not an
    arbitrary
    >  > value.
    > I think he meant
    >     hasattr(x,"y") <-> (x.y and True except AttributeError: False)

    With PEP 463, the explicit equivalent of hasattr() would be
    something like :

    hasattr(x,"y") <-> (bool(x.y) or True except AttributeError: False)

That would work, but I think I'd prefer:

hasattr(x,"y") <-> bool(x.y or True except AttributeError: False)

Makes it clearer IMO that the entire expression will always return a boolean.

This also works:

hasattr(x,"y")  <->  (lambda v: True)(x.y) except AttributeError: False

Which is less obscure is a matter of judgement.
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