About a PyQt example program

Question

I\'m currently need GUI library for a project. I\'m familiar with python and found PyQt might be a good choice.

I\'m reading a tutorial about PyQt, and quite confuse

Answer 1

app.exec_() starts the qt main loop, which ends when every created widget is destroyed (e.g. by closing its window). The paintEvent function is a method that you can overload from a QWidget subclass like the given Example class, which gets called when QT displays, updates or repaints the Widget.

You can look up these things in the Qt documentation or the PyQt Documentation (which is mostly just a copy of the QT Documentation in a different format, but sometimes contains some valuable information regarding PyQt-specific things).