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Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment)

References <b3d3518a-f24a-4c32-a41a-b99145753528@googlegroups.com> <kqa981$9uu$1@reader2.panix.com>
From Joshua Landau <joshua.landau.ws@gmail.com>
Date 2013-06-24 21:33 +0100
Subject Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment)
Newsgroups comp.lang.python
Message-ID <mailman.3763.1372106041.3114.python-list@python.org> (permalink)

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On 24 June 2013 21:12, John Gordon <gordon@panix.com> wrote:
> Since you're new to programming, this might be a bit tricky to explain,
> but I'll do my best. :-)
>
> The problem is that change() isn't being executed here; instead it's being
> executed from within root.mainloop(), whenever the user presses button-1.
>
> And within root.mainloop(), there is no variable called isWhite.

Sorry, but I don't think you're right. Functions "carry" their
contexts around with them, so that shouldn't matter

(See Peter and Antoon's comments for explanation of what I think it is)

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What's wrong with this code? (UnboundLocalError: local variable referenced before assignment) pablobarhamalzas@gmail.com - 2013-06-24 12:47 -0700
  Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment) pablobarhamalzas@gmail.com - 2013-06-24 12:53 -0700
  Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment) Peter Otten <__peter__@web.de> - 2013-06-24 22:05 +0200
  Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment) Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-06-24 22:10 +0200
  Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment) John Gordon <gordon@panix.com> - 2013-06-24 20:12 +0000
    Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment) Joshua Landau <joshua.landau.ws@gmail.com> - 2013-06-24 21:33 +0100
    Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment) Dave Angel <davea@davea.name> - 2013-06-24 16:43 -0400
      Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment) John Gordon <gordon@panix.com> - 2013-06-24 21:41 +0000
  Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment) pablobarhamalzas@gmail.com - 2013-06-24 13:19 -0700
    Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment) Joshua Landau <joshua.landau.ws@gmail.com> - 2013-06-24 21:33 +0100
  Re: What's wrong with this code? (UnboundLocalError: local variable referenced before assignment) Joshua Landau <joshua.landau.ws@gmail.com> - 2013-06-24 21:19 +0100

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