Override the closeEvent method of QWidget in your main window. For example: class MainWindow(QWidget): # or QMainWindow … def closeEvent(self, event): # do stuff if can_exit: event.accept() # let the window close else: event.ignore() Another possibility is to use the QApplication‘s aboutToQuit signal like this: app = QApplication(sys.argv) app.aboutToQuit.connect(myExitHandler) # myExitHandler is a callable
This can be solved by setting the resize-mode for each column. The first section must stretch to take up the available space, whilst the last two sections just resize to their contents: PyQt5: header = self.table.horizontalHeader() header.setSectionResizeMode(0, QHeaderView.Stretch) header.setSectionResizeMode(1, QHeaderView.ResizeToContents) header.setSectionResizeMode(2, QHeaderView.ResizeToContents) PyQt6/PyQt5: header = self.table.horizontalHeader() header.setSectionResizeMode(0, QHeaderView.ResizeMode.Stretch) header.setSectionResizeMode(1, QHeaderView.ResizeMode.ResizeToContents) header.setSectionResizeMode(2, QHeaderView.ResizeMode.ResizeToContents) PyQt4: header = … Read more
This link explains the following about the pyqtSlot decorator: Although PyQt4 allows any Python callable to be used as a slot when connecting signals, it is sometimes necessary to explicitly mark a Python method as being a Qt slot and to provide a C++ signature for it. PyQt4 provides the pyqtSlot() function decorator to do … Read more
It should be enough to create an empty virtualenv and then copy the contents of the …/site-packages/PyQt4 directories into it. I suggest to install PyQt4 once globally, make a copy of the directory, uninstall it and then use this trick to create VEs.
Both toolkits are actively maintained, and by now more or less equal in features and quality. There are only few, rather unimportant differences. Still, I’d recommend PySide for Python 2. It has a more reasonable API, mainly it doesn’t expose Qt types, which have a direct equivalent in Python (e.g. QString, QList, etc.) or which … Read more