Replace uses of exec_ with exec

examples/add_to_app.py

@@ -69,4 +69,4 @@ def raise_error():
     act.triggered.connect(raise_error)
 
     main_gui.show()
-    app.exec_()
+    app.exec()

examples/output_console.py

@@ -240,4 +240,4 @@ def send_logging(self):
     main_gui = ExampleApp(init_preditor=not args.no_preditor)
 
     main_gui.show()
-    app.exec_()
+    app.exec()

preditor/excepthooks.py

@@ -137,7 +137,7 @@ def ask_to_show_logger(self, *exc_info):
             ConsolePrEdit._errorPrompted = True
             errorDialog = config.error_dialog_class(config.root_window())
             errorDialog.setText(exc_info)
-            errorDialog.exec_()
+            errorDialog.exec()
 
         # interrupted until dialog closed
         finally:

preditor/gui/app.py

@@ -160,4 +160,4 @@ def start(self):
         """Exec's the QApplication if it hasn't already been started."""
         if self.app_created and self.app and not self.app_has_exec:
             self.app_has_exec = True
-            Qt.QtCompat.QApplication.exec_()
+            Qt.QtCompat.QApplication.exec()