Sequencing images using tkinter?

[Terry Reedy]

On 8/30/2014 11:54 AM, theteacher.info at gmail.com wrote:
> I've started to learn to use tkinter but can't seem to rotate images.
>
> Here is a Python 3.4 program to illustrate the problem.
 > Anyone spot why the for loop doesn't seem to want to display
 > a sucssession of images please? Thanks.
>
> import sys
> from tkinter import *
> import random
> from time import sleep
>
> myGui = Tk()
> myGui.geometry("1000x800+400+100")
> myGui.title("The Random Machine")
>
> monsters = ["py01.gif", "py02.gif", "py03.gif", "py04.gif", "py05.gif", "py06.gif", "py07.gif", "py08.gif",
>              "py09.gif", "py10.gif", "py11.gif", "py12.gif", "py13.gif", "py14.gif", "py15.gif", "py16.gif",
>              "py17.gif", "py18.gif", "py19.gif", "py20.gif",]
>
>
> #Main canvas
> canvas1 = Canvas(myGui, width=1000, height=800, bg="white")
> canvas1.place(x=0,y=0)
>
>
> #button
> myButton1=Button(canvas1, text='OK', justify = LEFT)
>
> for i in range(10):
>     myImage = PhotoImage(file="MonsterImages/Converted/" + random.choice(monsters))
>     myButton1.config(image=myImage, width="100", height="200")
>     myButton1.place(x=500,y=300)
>     sleep(0.2)
>
> myGui.mainloop()

I tried a simplified version of this in the Idle shell. Idle displays 
call tips if you pause after typing '('.  Unlike .pack and .grid, .place 
apparently does not automatically put the widget in its master. At least 
this is true when placing in a canvas. You need an 'in_' argument (the 
'_' is needed to not be the keyword 'in').  Try

canvas1.pack() #don't use place unless really needed.
...
myButton1.place(in_=canvas1, x=500, y=300)

-- 
Terry Jan Reedy