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Tkinter GUI Programming by Example
book

Tkinter GUI Programming by Example

by David Love
April 2018
Beginner content levelBeginner
340 pages
7h 54m
English
Packt Publishing
Content preview from Tkinter GUI Programming by Example

Using and updating

Since these variables are objects, we cannot assign to them a statement like label_text = "Hello World!". Instead, each variable exposes a get and set method. Let's have a play with these in the interactive shell:

>>> from tkinter import * >>> win = Tk() >>> sv = StringVar() >>> sv <tkinter.StringVar object at 0x05F82D50> >>> sv.get() '' >>> sv.set("Hello World!") >>> sv.get() 'Hello World!' >>> sv.set(sv.get() + " How's it going?") >>> sv.get() "Hello World! How's it going?"

These variables are passed to widgets inside their keyword arguments upon creation (or at a later stage, using configure). The keyword arguments expecting these special variables will usually end in var.  In the case of a label, the argument is textvar ...

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Publisher Resources

ISBN: 9781788627481Supplemental Content