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Python GUI Programming with Tkinter
book

Python GUI Programming with Tkinter

by Alan D. Moore
May 2018
Beginner to intermediate content levelBeginner to intermediate
452 pages
11h 26m
English
Packt Publishing
Content preview from Python GUI Programming with Tkinter

Validating user input

At first glance, Tkinter's selection of the input widgets seems a little disappointing. It doesn't give us a true number entry that only allows digits, nor a true drop-down selector that only allows items from the drop-down list to be selected. We have no date inputs, email inputs, or other specially-formatted input widgets.

But these weaknesses can become strengths. Because these widgets assume nothing, we can make them behave in a way that's appropriate to our specific needs, rather than some generic way that may or may not work optimally. For example, letters may seem inappropriate in a number entry, but are they? In Python, strings such as NaN and Infinity are valid float values; having a box that could increment ...

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Publisher Resources

ISBN: 9781788835886Supplemental Content