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Re: scope of function parameters

References <F8395F78-615E-4FBD-B6FC-1D6173EAEA45@mcgill.ca> <mailman.2217.1306662671.9059.python-list@python.org> <4de24045$0$29996$c3e8da3$5496439d@news.astraweb.com> <BANLkTinK=dHCbocURD2+s5uvdonBkS+uFQ@mail.gmail.com> <BANLkTimWP+jP0s5DsBaFbv6LV5OTYA8hQw@mail.gmail.com>
Date 2011-05-30 04:38 +1000
Subject Re: scope of function parameters
From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.2233.1306694309.9059.python-list@python.org> (permalink)

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On Mon, May 30, 2011 at 4:01 AM, Chris Rebert <clp2@rebertia.com> wrote:
> def foo():
>    print bar
>    bar = 42
>
> foo()
>
> ===>
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
>  File "<stdin>", line 2, in foo
> UnboundLocalError: local variable 'bar' referenced before assignment

Wow

I thought it basically functioned top-down. You get a different error
on the print line if there's a "bar = 42" *after* it. This could make
debugging quite confusing.

Guess it's just one of the consequences of eschewing variable
declarations. Sure it's easier, but there's complications down the
road.

Chris Angelico

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Thread

Re: scope of function parameters Wolfgang Rohdewald <wolfgang@rohdewald.de> - 2011-05-29 11:47 +0200
  Re: scope of function parameters Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-29 12:47 +0000
    Re: scope of function parameters Chris Angelico <rosuav@gmail.com> - 2011-05-30 03:53 +1000
      Re: scope of function parameters Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-29 18:28 +0000
    Re: scope of function parameters Chris Rebert <clp2@rebertia.com> - 2011-05-29 11:01 -0700
    Re: scope of function parameters Chris Angelico <rosuav@gmail.com> - 2011-05-30 04:38 +1000
      Re: scope of function parameters Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-29 18:53 +0000
        Re: scope of function parameters Chris Angelico <rosuav@gmail.com> - 2011-05-30 05:20 +1000
    Re: scope of function parameters Ian Kelly <ian.g.kelly@gmail.com> - 2011-05-29 13:12 -0600

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