I wrote one of the main program, when reaching a condition called a desktop widget implemented using pyqt

 if XX: 
App=QApplication (sys. Argv) 
P=pet. DesktopPet () # import pet come in a py files, DesktopPet is a Class Class 
Sys. Exit (app. Exec_ ()) 

in pet. Py, wrote out method, click the exit button

 def quit (self) : 
The self. The close () 
Sys. The exit () 

This will end the entire program, I want to achieve is totally out of widgets, then return to the main program, the main program very common

Ask everybody to help me have a look, give me some advice!!!!!