Re: What for -- for? (was A bug?)

References	(3 earlier) <m2pinn$hum$2@dont-email.me> <94e3143a-c9ab-433d-8b3d-6ab296de14d9@googlegroups.com> <CAKJDb-PEj4UWpFFTvJN_gh-AOTHJwS0D7+_WUdeLkWyQ-KsQVg@mail.gmail.com> <mailman.15282.1414556609.18130.python-list@python.org> <593c0099-770f-48cd-b7ba-22154b00f130@googlegroups.com>
From	Zachary Ware <zachary.ware+pylist@gmail.com>
Date	2014-10-28 23:59 -0500
Subject	Re: What for -- for? (was A bug?)
Newsgroups	comp.lang.python
Message-ID	<mailman.15283.1414558776.18130.python-list@python.org> (permalink)

Show all headers | View raw

On Tue, Oct 28, 2014 at 11:40 PM, Rustom Mody <rustompmody@gmail.com> wrote:
> On Wednesday, October 29, 2014 9:53:46 AM UTC+5:30, Zachary Ware wrote:
>> On Tue, Oct 28, 2014 at 11:16 PM, Zachary Ware wrote:
>> > def get_abc_map(cls):
>> >    return {n: issubclass(cls, getattr(abc, n)) for n in dir(abc) if
>> > n[0].isupper()}
>>
>> Of course, Gmail decided to wrap my long line for me.  In case it's
>> not obvious, that should be a single line.
>
> Thanks
>
> Wrapping -- no problem.
> But the isupper looks like black-magic :-)
>
> And removing the ' ... if n[0].isupper()'
> breaks the code

It's a terrible hack for 2/3 compatibility; in 3 I'd do "if not
n.startswith('__')" since the Python 3 collections.abc module only
contains ABCs (and the standard dunder names).  Python 2 has all the
ABCs mixed into the toplevel collections namespace with some other
non-ABCs, but it happens that all the ABCs are capitalized, while the
non-ABCs are not.  The ABCs are imported into collections from
_abcoll, but _abcoll also some uncapitalized non-ABCs as well.

For somewhat greyer magic, do 'from abc import ABCMeta' and filter the
collections<.abc> namespace with isinstance(obj, ABCMeta).  I just
used the above because it's short and sweet and keeps the name handy
:)

-- 
Zach

Thread

A bug? "umatrp@gmail.com" <trsexgl@gmail.com> - 2014-10-27 09:01 -0700
  Re: A bug? Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de> - 2014-10-27 17:17 +0100
  Re: A bug? Ian Kelly <ian.g.kelly@gmail.com> - 2014-10-27 10:26 -0600
  Re: A bug? Denis McMahon <denismfmcmahon@gmail.com> - 2014-10-28 00:36 +0000
    Re: A bug? Rustom Mody <rustompmody@gmail.com> - 2014-10-27 18:12 -0700
      Re: A bug? Chris Angelico <rosuav@gmail.com> - 2014-10-28 12:25 +1100
        Re: A bug? Rustom Mody <rustompmody@gmail.com> - 2014-10-27 19:13 -0700
    Re: A bug? Joshua Landau <joshua@landau.ws> - 2014-10-28 01:29 +0000
      Re: A bug? Denis McMahon <denismfmcmahon@gmail.com> - 2014-10-29 02:17 +0000
        What for -- for?  (was A bug?) Rustom Mody <rustompmody@gmail.com> - 2014-10-28 20:22 -0700
          Re: What for -- for? (was A bug?) Zachary Ware <zachary.ware+pylist@gmail.com> - 2014-10-28 23:16 -0500
          Re: What for -- for? (was A bug?) Zachary Ware <zachary.ware+pylist@gmail.com> - 2014-10-28 23:23 -0500
            Re: What for -- for? (was A bug?) Rustom Mody <rustompmody@gmail.com> - 2014-10-28 21:40 -0700
              Re: What for -- for? (was A bug?) Zachary Ware <zachary.ware+pylist@gmail.com> - 2014-10-28 23:59 -0500
                Re: What for -- for? (was A bug?) Rustom Mody <rustompmody@gmail.com> - 2014-10-28 22:15 -0700
                Re: What for -- for? (was A bug?) Zachary Ware <zachary.ware+pylist@gmail.com> - 2014-10-29 00:39 -0500
                Re: What for -- for? (was A bug?) Rustom Mody <rustompmody@gmail.com> - 2014-10-28 23:11 -0700
                Re: What for -- for? (was A bug?) Zachary Ware <zachary.ware+pylist@gmail.com> - 2014-10-29 01:18 -0500
                Finding way around ABCs (was What for -- for? (was A bug?)) Rustom Mody <rustompmody@gmail.com> - 2014-10-30 10:01 -0700
                Re: Finding way around ABCs (was What for -- for? (was A bug?)) Ian Kelly <ian.g.kelly@gmail.com> - 2014-10-30 11:09 -0600
                Re: Finding way around ABCs (was What for -- for? (was A bug?)) Rustom Mody <rustompmody@gmail.com> - 2014-10-30 10:16 -0700
                Re: Finding way around ABCs (was What for -- for? (was A bug?)) Ian Kelly <ian.g.kelly@gmail.com> - 2014-10-30 11:11 -0600
          Re: What for -- for? (was A bug?) Ben Finney <ben+python@benfinney.id.au> - 2014-10-29 16:27 +1100
          Re: What for -- for? (was A bug?) Zachary Ware <zachary.ware+pylist@gmail.com> - 2014-10-29 00:42 -0500
            Re: What for -- for? (was A bug?) Rustom Mody <rustompmody@gmail.com> - 2014-10-28 22:57 -0700
          Re: What for -- for? (was A bug?) Ben Finney <ben+python@benfinney.id.au> - 2014-10-29 17:02 +1100
          Re: What for -- for? (was A bug?) Joshua Landau <joshua@landau.ws> - 2014-10-30 17:21 +0000
            Re: What for -- for? (was A bug?) Rustom Mody <rustompmody@gmail.com> - 2014-10-30 10:41 -0700

csiph-web