Question about code writing '% i, callback'

Newsgroups	comp.lang.python
Date	2015-11-30 08:44 -0800
Message-ID	<25af8ac3-5fc7-44bd-a73f-7a870b69515a@googlegroups.com> (permalink)
Subject	Question about code writing '% i, callback'
From	fl <rxjwg98@gmail.com>

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Hi,

I come across the following code snippet.





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




The content inside parenthesis in last line is strange to me. 

"button %s" % i, callback


That is, the writing looks like recognized as three items when I try with a
class definition (it can run with this):

class buibutton():
    print 'sd'
    def __nonzero__(self):
       return False
       
    def Button(str, ii, callbackk):
        
        return


Could you explain it to me?

The link is here:

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

Thanks,

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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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