Question about code writing '% i, callback'

Terry Reedy tjreedy at udel.edu
Mon Nov 30 12:36:56 EST 2015


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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