In this fifth video of creating a speech synthesis app in Python we learn about threading.

Threading allows us to separate or contain parts of the main app, a situation that needs special attention in graphical or GUI applications. Without threading, every time you'd click a button or run a function, the application would freeze or become unresponsive until the function completed. Obviously, we want to, maybe, deal with some other part of the application while it's doing something (running a function) hence we need responsiveness. 

In this particular case, I contain or isolate the running of the 'Speaking' function of the application within a thread, so every time we click the 'Speak' button and Ivona starts speaking, the app does not freeze, or remains responsive. I guess you will understand better by watching the tutorial...
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Previously in this series:

1. [Making a Voice Synthesis App with Ivona and Python - Part 1](https://steemit.com/programming/@cristi/making-a-voice-synthesis-app-with-ivona-and-python-part-1)
2. [Making a Voice Synthesis App with Ivona and Python - Part 2](https://steemit.com/programming/@cristi/making-a-voice-synthesis-app-with-ivona-and-python-part-2)
3. [Making a Voice Synthesis App with Ivona and Python - Part 3](https://steemit.com/programming/@cristi/making-a-voice-synthesis-app-with-ivona-and-python-part-3)
4. [Making a Voice Synthesis App with Ivona and Python - Part 4](https://steemit.com/programming/@cristi/making-a-voice-synthesis-app-with-ivona-and-python-part-4)
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<center>https://www.youtube.com/watch?v=XOvaRTYwEao</center>
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[Cristi Vlad](http://cristivlad.com), Self-Experimenter and Author