Free tutorial:
Source from TutorialsPoint
https://github.com/Orizzu/PyQt5-Tutorial/blob/main/pyqt_tutorial.pdf
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Best Option :
its 15$
19$ with videos
https://www.learnpyqt.com/pyqt5-book/
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For a more free descriptive tutorial there is a pdf in the link below:
Source from RiverBankComputing
https://github.com/Orizzu/PyQt5-Tutorial/blob/main/PyQt5%20Tutorial.pdf