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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def closeEvent(self, event):
 """ Saves dirty editors on close and cancel the event if the user choosed to continue to work. :param event: close event """

        dirty_widgets = []
        for w in self.widgets(include_clones=False):
            if w.dirty:
                dirty_widgets.append(w)
        filenames = []
        for w in dirty_widgets:
            if os.path.exists(w.file.path):
                filenames.append(w.file.path)
            else:
                filenames.append(w.documentTitle())
        if len(filenames) == 0:
            self.close_all()
            return
        dlg = DlgUnsavedFiles(self, files=filenames)
        if dlg.exec_() == dlg.Accepted:
            if not dlg.discarded:
                for item in dlg.listWidget.selectedItems():
                    filename = item.text()
                    widget = None
                    for widget in dirty_widgets:
                        if widget.file.path == filename or \
                                widget.documentTitle() == filename:
                            break
                    tw = widget.parent_tab_widget
                    tw.save_widget(widget)
                    tw.remove_tab(tw.indexOf(widget))
            self.close_all()
        else:
            event.ignore()