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Re: scope of function parameters

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Date Sun, 29 May 2011 11:01:18 -0700
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Subject Re: scope of function parameters
From Chris Rebert <clp2@rebertia.com>
To Chris Angelico <rosuav@gmail.com>
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On Sun, May 29, 2011 at 10:53 AM, Chris Angelico <rosuav@gmail.com> wrote:
> On Sun, May 29, 2011 at 10:47 PM, Steven D'Aprano
> <steve+comp.lang.python@pearwood.info> wrote:
>> If a name is assigned to anywhere in the function, treat it as a local,
>> and look it up in the local namespace. If not found, raise
>> UnboundLocalError.
>>
>
> Wait wha? I've never seen this... wouldn't it just create it in the
> local namespace?
>
> Can you give example code that will trigger this error? I'm curious, now...

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

Cheers,
Chris

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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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