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QML vs Qt Designer vs clean code? (in the context of PyQt)

I am a greedy pythonista who wants to create my first serious GUI desktop application, and it seems that Qt is the best option for this, so I started to study it, and I seem to find there three options for how you can create your interface :

  • QML
  • Qt Designer
  • Pure code (python / C ++ only)

Now I'm trying to find out if there are differences in the capabilities of these three approaches. Do I have the same amount of control with all three? What are the pros and cons?

Also, how much control do I have? Can I customize the user interface to some extent, for example, in the Spotify interface, where almost everything is a unique user widget? Or am I stuck in more or less general cases from boxes?

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I have been working with PyQt for some time (4 years), and I prefer user interface coding for simple applications; but for the rest I use Qt Designer. With PyQt, you can convert the .ui file generated by the constructor into a .py file, so if something is not to your liking, you can always override it in your code (for example, override QWidgets, etc.).

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