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table of contents

guis and data
8 Data entry widgets

GUIs don’t just process events. They also handle data.
Almost all GUI applications need to read user data, and choosing the right widgets can
change your interface from data entry hell to user heaven. Widgets can accept plain
text, or just present a menu of options. There are lots of different widgets out there,
which means there are lots of choices, too. And, of course, making the right choice can
make all the difference. It’s time to take your GUI program to the next level.

Head-Ex needs a new delivery system 258
They’ve already designed the interface 259
Read data from the GUI 260
The Entry and Text widgets let you enter text data into your GUI 261
Read and write data to text fields 262
Large Text fields are harder to handle 263
One of the Head-Ex deliveries went astray 270
Users can enter anything in the fields 271
Radio buttons force users to choose a valid depot 272
Creating radio buttons in tkinter 273
The radio buttons should work together 275
The radio buttons can share a model 276
The system tells the other widgets when the model changes 277
So how do you use models in tkinter? 278
Head-Ex’s business is expanding 282
There are too many depots on the GUI 283
An OptionMenu lets you have as many options as needed 284
The model stays the same 285
Look, I don‛t care Things are going great at Head-Ex 291
what you guys do, I‛m Your Programming Toolbox 292
gonna stay selected.

Yeah,
me too.

Huh, and me.
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