Signals, Slots and Events: NameError: name 'QMainWindow' is not defined

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I added the import from PyQt5.QtWidgets import QApplication, QMainWindow

But when I start the programme it seems to do nothing. Tried it under WingIDE pro and cmd → python “filename”

Since I just copied and pasted your programme snippet and added from PyQt5.QtWidgets import QApplication, QMainWindow . I do not see what I am doing wrong.