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Re: Python's numeric tower

From Roy Smith <roy@panix.com>
Newsgroups comp.lang.python
Subject Re: Python's numeric tower
Date 2014-06-15 13:28 -0400
Organization PANIX Public Access Internet and UNIX, NYC
Message-ID <roy-671447.13284415062014@news.panix.com> (permalink)
References <539d0a40$0$29988$c3e8da3$5496439d@news.astraweb.com> <mailman.11068.1402818363.18130.python-list@python.org> <539dbcbe$0$29988$c3e8da3$5496439d@news.astraweb.com>

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In article <539dbcbe$0$29988$c3e8da3$5496439d@news.astraweb.com>,
 Steven D'Aprano <steve+comp.lang.python@pearwood.info> wrote:

> On Sun, 15 Jun 2014 01:22:50 -0600, Ian Kelly wrote:
> 
> > On Sat, Jun 14, 2014 at 8:51 PM, Steven D'Aprano
> > <steve+comp.lang.python@pearwood.info> wrote:
> >> Does anyone know any examples of values or types from the standard
> >> library or well-known third-party libraries which satisfies
> >> isinstance(a, numbers.Number) but not isinstance(a, numbers.Complex)?
> > 
> >>>> issubclass(decimal.Decimal, numbers.Number)
> > True
> >>>> issubclass(decimal.Decimal, numbers.Complex)
> > False
> 
> Well, that surprises and disappoints me, but thank you for the answer.

Why would you expect Decimal to be a subclass of Complex?

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Thread

Python's numeric tower Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-06-15 02:51 +0000
  Re: Python's numeric tower Ian Kelly <ian.g.kelly@gmail.com> - 2014-06-15 01:22 -0600
    Re: Python's numeric tower Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-06-15 15:33 +0000
      Re: Python's numeric tower Roy Smith <roy@panix.com> - 2014-06-15 13:28 -0400
        Re: Python's numeric tower Ian Kelly <ian.g.kelly@gmail.com> - 2014-06-15 11:45 -0600
        Re: Python's numeric tower Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-06-16 00:38 +0000
          Re: Python's numeric tower Chris Angelico <rosuav@gmail.com> - 2014-06-16 11:02 +1000
            Re: Python's numeric tower Roy Smith <roy@panix.com> - 2014-06-15 21:57 -0400
              Re: Python's numeric tower Chris Angelico <rosuav@gmail.com> - 2014-06-16 12:04 +1000
                Re: Python's numeric tower Roy Smith <roy@panix.com> - 2014-06-15 22:17 -0400
                Re: Python's numeric tower Dan Sommers <dan@tombstonezero.net> - 2014-06-16 03:38 +0000
                Re: Python's numeric tower Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-06-16 09:29 +0100
                Re: Python's numeric tower Roy Smith <roy@panix.com> - 2014-06-15 23:48 -0400

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