How does Kivy's dropdown.select() know which button to select? How does the lambda function fit in here? (Documentation included.)

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  • kivy

    Open source UI framework written in Python, running on Windows, Linux, macOS, Android and iOS

    Kivy's event logic is written mostly in cython and can be seen here. There's a fair bit to it though as the code handles a lot of different specifics. The core idea is much simpler than it might look, essentially the event handler is storing a reference to your function and calling it later with an argument.

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