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Re: A syntax question

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You may want to read:

https://docs.python.org/3/faq/programming.html?highlight=global#why-am-i-getting-an-unboundlocalerror-when-the-variable-has-a-value

from the Python docs Programming FAQ section.
It explains your problem pretty well.

As others have hinted at, always provide concrete Python error messages 
and tracebacks instead of vague descriptions.

Best,
Wolfgang


On 11/10/2014 12:07 PM, Mok-Kong Shen wrote:
>
> I don't understand the following phenomenon. Could someone kindly
> explain it? Thanks in advance.
>
> M. K. Shen
>
> -------------------------------------------------
>
> count=5
>
> def test():
>    print(count)
>    if count==5:
>      count+=0  ### Error message if this line is active, otherwise ok.
>      print(count)
>    return
>
> test()

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A syntax question Mok-Kong Shen <mok-kong.shen@t-online.de> - 2014-11-10 12:07 +0100
  Re: A syntax question alister <alister.nospam.ware@ntlworld.com> - 2014-11-10 11:23 +0000
    Re: A syntax question David Palao <dpalao.python@gmail.com> - 2014-11-10 12:31 +0100
      Re: A syntax question Grant Edwards <invalid@invalid.invalid> - 2014-11-10 14:44 +0000
        Re: A syntax question alister <alister.nospam.ware@ntlworld.com> - 2014-11-10 14:54 +0000
          Re: A syntax question alister <alister.nospam.ware@ntlworld.com> - 2014-11-10 14:56 +0000
            Re: A syntax question Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-11-10 19:53 -0500
              Re: A syntax question alister <alister.nospam.ware@ntlworld.com> - 2014-11-11 09:04 +0000
          Re: A syntax question Grant Edwards <invalid@invalid.invalid> - 2014-11-10 16:11 +0000
            Re: A syntax question Chris Angelico <rosuav@gmail.com> - 2014-11-11 03:18 +1100
              Re: A syntax question Roy Smith <roy@panix.com> - 2014-11-10 14:48 -0500
    Re: A syntax question Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-11-10 20:08 +0000
    Re: A syntax question Tim Chase <python.list@tim.thechases.com> - 2014-11-10 14:29 -0600
  Re: A syntax question Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de> - 2014-11-10 12:39 +0100
  Re: A syntax question Joel Goldstick <joel.goldstick@gmail.com> - 2014-11-10 09:35 -0500
  Re: A syntax question Chris Angelico <rosuav@gmail.com> - 2014-11-11 01:54 +1100
  Re: A syntax question Peter Otten <__peter__@web.de> - 2014-11-10 16:10 +0100
  Re: A syntax question Joel Goldstick <joel.goldstick@gmail.com> - 2014-11-10 10:27 -0500

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