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Re: Show off your Python chops and compete with others

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On Fri, Nov 8, 2013 at 1:18 PM, Roy Smith <roy@panix.com> wrote:
> It's not a shifting goalpost.  My original statement was that:
>
> def foo():
>    raise Exception
>
> defines a function which 1) has no explicit return statement and 2) does
> not return None.  I stand by that statement.  There is no possible
> codepath, no possible calling sequence, no possible execution
> environment, which will cause that function to return None.  That fact
> that one particular Python implementation happens to produce unreachable
> bytecode for returning None is meaningless.  Would you say that:
>
> def baz():
>    return None
>    print "I got here"
>
> is a function which prints "I got here"?

Granted, but I would describe this:

def foo(x):
    return "Hello, world!\n" + str(x)

as a function which returns a string. Is it? Well, not if str raises
an exception. Even if the only arguments you can give to foo will
result in exceptions, I would still say that, per design, this is a
function that returns a string. The possibility of raising an
exception (and thus not returning anything) doesn't change a
function's return type (by which I mean more than just what C would
use as the declaration - I could just as well say "Returns the name of
an employee", and the same argument would apply).

ChrisA

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Thread

Show off your Python chops and compete with others Nathaniel Sokoll-Ward <nathanielsokollward@gmail.com> - 2013-11-06 16:00 -0800
  Re: Show off your Python chops and compete with others Andrew Cooper <root@127.0.0.1> - 2013-11-07 00:13 +0000
    Re: Show off your Python chops and compete with others Roy Smith <roy@panix.com> - 2013-11-06 19:24 -0500
      Re: Show off your Python chops and compete with others Andrew Cooper <root@127.0.0.1> - 2013-11-07 00:28 +0000
        Re: Show off your Python chops and compete with others Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-07 00:38 +0000
  Re: Show off your Python chops and compete with others Chris Angelico <rosuav@gmail.com> - 2013-11-07 11:59 +1100
  Re: Show off your Python chops and compete with others Chris Angelico <rosuav@gmail.com> - 2013-11-07 12:04 +1100
    Re: Show off your Python chops and compete with others John Nagle <nagle@animats.com> - 2013-11-06 17:31 -0800
      Re: Show off your Python chops and compete with others Tim Chase <python.list@tim.thechases.com> - 2013-11-06 21:19 -0600
        Re: Show off your Python chops and compete with others Nathaniel Sokoll-Ward <nathanielsokollward@gmail.com> - 2013-11-07 10:38 -0800
          Re: Show off your Python chops and compete with others Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-07 18:48 +0000
          Re: Show off your Python chops and compete with others Alister <alister.ware@ntlworld.com> - 2013-11-07 19:08 +0000
            Re: Show off your Python chops and compete with others Roy Smith <roy@panix.com> - 2013-11-07 20:02 -0500
              Re: Show off your Python chops and compete with others alex23 <wuwei23@gmail.com> - 2013-11-08 11:49 +1000
                Re: Show off your Python chops and compete with others Roy Smith <roy@panix.com> - 2013-11-07 20:54 -0500
                Re: Show off your Python chops and compete with others alex23 <wuwei23@gmail.com> - 2013-11-08 12:08 +1000
                Re: Show off your Python chops and compete with others Roy Smith <roy@panix.com> - 2013-11-07 21:18 -0500
                Re: Show off your Python chops and compete with others Chris Angelico <rosuav@gmail.com> - 2013-11-08 13:26 +1100
                Re: Show off your Python chops and compete with others Tim Chase <python.list@tim.thechases.com> - 2013-11-07 22:05 -0600
                Re: Show off your Python chops and compete with others Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-11-08 05:26 +0000
                Re: Show off your Python chops and compete with others Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-08 09:23 +0000
                Re: Show off your Python chops and compete with others Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2013-11-08 19:47 +1300
          Re: Show off your Python chops and compete with others Chris Angelico <rosuav@gmail.com> - 2013-11-08 09:55 +1100
        Re: Show off your Python chops and compete with others jskirst@gmail.com - 2013-11-07 11:02 -0800
          Re: Show off your Python chops and compete with others Tim Chase <python.list@tim.thechases.com> - 2013-11-07 13:30 -0600
          Re: Show off your Python chops and compete with others 88888 Dihedral <dihedral88888@gmail.com> - 2013-11-07 16:19 -0800
  Re: Show off your Python chops and compete with others MRAB <python@mrabarnett.plus.com> - 2013-11-07 01:12 +0000
  Re: Show off your Python chops and compete with others Chris Angelico <rosuav@gmail.com> - 2013-11-07 12:17 +1100
  Re: Show off your Python chops and compete with others John Ladasky <john_ladasky@sbcglobal.net> - 2013-11-06 17:55 -0800
    Re: Show off your Python chops and compete with others Chris Angelico <rosuav@gmail.com> - 2013-11-07 13:07 +1100
  Re: Show off your Python chops and compete with others Omar Abou Mrad <omar.aboumrad@gmail.com> - 2013-11-08 09:09 +0200
  Re: Show off your Python chops and compete with others Nathaniel Sokoll-Ward <nathanielsokollward@gmail.com> - 2013-11-12 09:20 -0800

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