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Re: Question about code writing '% i, callback'

Path csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail
From Terry Reedy <tjreedy@udel.edu>
Newsgroups comp.lang.python
Subject Re: Question about code writing '% i, callback'
Date Mon, 30 Nov 2015 12:36:56 -0500
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On 11/30/2015 11:44 AM, fl wrote:

> I come across the following code snippet.

> for i in range(10):
>      def callback():
>          print "clicked button", i
>      UI.Button("button %s" % i, callback)

> http://effbot.org/zone/default-values.htm

Note that the above is an intentional example of common buggy code.  It 
is followed by a version that works, with 'i=i' added to the callback 
header.

-- 
Terry Jan Reedy

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Thread

Question about code writing '% i, callback' fl <rxjwg98@gmail.com> - 2015-11-30 08:44 -0800
  Re: Question about code writing '% i, callback' Zachary Ware <zachary.ware+pylist@gmail.com> - 2015-11-30 10:53 -0600
  Re: Question about code writing '% i, callback' Zachary Ware <zachary.ware+pylist@gmail.com> - 2015-11-30 10:54 -0600
  Re: Question about code writing '% i, callback' Ian Kelly <ian.g.kelly@gmail.com> - 2015-11-30 11:01 -0600
    Re: Question about code writing '% i, callback' fl <rxjwg98@gmail.com> - 2015-11-30 10:55 -0800
      Re: Question about code writing '% i, callback' Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-11-30 20:44 -0500
      Re: Question about code writing '% i, callback' Ian Kelly <ian.g.kelly@gmail.com> - 2015-12-01 09:53 -0600
  Re: Question about code writing '% i, callback' fl <rxjwg98@gmail.com> - 2015-11-30 09:36 -0800
    Re: Question about code writing '% i, callback' Ian Kelly <ian.g.kelly@gmail.com> - 2015-11-30 11:24 -0700
  Re: Question about code writing '% i, callback' Terry Reedy <tjreedy@udel.edu> - 2015-11-30 12:36 -0500
    Re: Question about code writing '% i, callback' fl <rxjwg98@gmail.com> - 2015-11-30 09:50 -0800

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