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From: Zachary Ware <zachary.ware+pylist@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: Question about code writing '% i, callback'
Date: Mon, 30 Nov 2015 10:53:08 -0600
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On Mon, Nov 30, 2015 at 10:44 AM, fl <rxjwg98@gmail.com> wrote:
> The content inside parenthesis in last line is strange to me.
>
> "button %s" % i, callback

https://docs.python.org/library/stdtypes.html#printf-style-string-formatting

-- 
Zach