[docs] [issue22155] Out of date code example for tkinter's createfilehandler

[Terry J. Reedy]

Terry J. Reedy added the comment:

Assuming that the details are correct, which I cannot check on Windows :-(, this looks good to me. If the tkinter doc is expanded and reorganized, that section might move but I cannot see a better place for it now. Martin, have you used that code (with Tkinter/tkinter) on both 2.7 and 3.x?  Serhiy, if you want me to apply this, after you check it, I will.

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<http://bugs.python.org/issue22155>
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