Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.python > #80464
| References | <m3q6ae$m8p$1@news.albasani.net> <m3q84d$6is$1@ger.gmane.org> |
|---|---|
| Date | 2014-11-10 09:35 -0500 |
| Subject | Re: A syntax question |
| From | Joel Goldstick <joel.goldstick@gmail.com> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.15623.1415630155.18130.python-list@python.org> (permalink) |
On Mon, Nov 10, 2014 at 6:39 AM, Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de> wrote: > 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() > > > -- > https://mail.python.org/mailman/listinfo/python-list Your problem is that count is not local. You are reading count from an outer scope. When you try to increment count in your function, it can't because it doesn't exist. Don't use globals. -- Joel Goldstick http://joelgoldstick.com
Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
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
csiph-web