The class Hello (QWidget) : 

InfSignal=pyqtSignal (list) 

Def check_login_func (self) : 
If USER_PWD. Get (self) user_line) text ())==self. Cla_line. The text () : 
Inf=[] 
Inf. Append (self) user_line) text ()) 
Inf. Append (self) cla_line) text ()) 
Self. InfSignal. Emit (inf) 

The follow-up should how to set the slot to the login window, please throw the login information received?