[prev in list] [next in list] [prev in thread] [next in thread] 

List:       python-dev
Subject:    [Python-Dev] Wither PEP 335 (Overloadable Boolean Operators)?
From:       "Jim Jewett" <jimjjewett () gmail ! com>
Date:       2007-05-25 19:33:28
Message-ID: fb6fbf560705251233k55d5e193o54969f24d864e0c6 () mail ! gmail ! com
[Download RAW message or body]

Greg,

If you do update this PEP, please update the __not__ portion as well,
at least regarding possible return values.

It currently says that __not__ can return NotImplemented, which falls
back to the current semantics.   (Why?  to override an explicit
__not__?  Then why not just put the current semantics on __object__,
and override by calling that directly?)

It does not yet say what will happen for objects that return something
else outside of {True, False}, such as

    class AntiBool(object):
        def __not__(self):  return self

Is that OK, because "not not X" should now be spelled "bool(x)", and
you haven't allowed the overriding of __bool__?  (And, if so, how does
that work Py3K?)

-jJ
_______________________________________________
Python-Dev mailing list
Python-Dev@python.org
http://mail.python.org/mailman/listinfo/python-dev
Unsubscribe: http://mail.python.org/mailman/options/python-dev/python-dev%40progressive-comp.com
[prev in list] [next in list] [prev in thread] [next in thread]