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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

Passing messages using a queue

We've solved the problem of the program freezing up, but now we have some new problems. The most obvious problem is that our callback immediately shows a message box claiming that we've successfully uploaded the file, even though the process is still ongoing in the background. A subtler and far worse problem is that we aren't alerted to errors. If you try running the callback without the test service running, it will still immediately claim that the upload succeeded, even though you can see on the terminal that exceptions are being raised. What's going on here?

The root problem here is that the Thread.start() method doesn't block, nor does it pass on exceptions caused in the thread's run() method. Those exceptions ...

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Publisher Resources

ISBN: 9781788835886Supplemental Content