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From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: 2.7.9: PhotoImage get/put
Date: Wed, 21 Oct 2015 03:51:21 -0400
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On 10/21/2015 1:50 AM, Randy Day wrote:

> When I read your post, I realized I'm doing
> a crude animation. After a bit of searching
> on 'python canvas animation', I found a
> reference to how it's done:
>
> I made my 'root' Tk instance global, and
> call root.update_idletasks() after the
> .put

I did not see the original post, but the alternative way to animate is 
to use root.after(milliseconds, callback, *args) at the end of callbacks 
to allow the event loop to process other events before re-calling the 
same or another callback.

-- 
Terry Jan Reedy