python 3.x - PYQT5 QSqlQuery Error -

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def seleccionar(self):     self.db =qsqldatabase.adddatabase(self.db_type)     self.db.sethostname(self.db_ip)     self.db.setdatabasename(self.db_name)     self.db.setusername(self.db_usname)     self.db.setpassword(self.db_password )     estado=self.db.open()     if estado==false:         qmessagebox.warning(self,"error",self.db.lasterror().text(),qmessagebox.discard)     else:         try:             self.table.setcolumncount(4)             self.table.sethorizontalheaderlabels(["pid","server_ip","server_id","server_pwd"])             row=0             sql="select * stt_server"             query=qsqlquery(sql)  #error             while query.next():                 self.table.insertrow(row)                 pid=qtablewidgetitem(str(query.value(0)))                 server_ip=qtablewidgetitem(str(query.value(1)))                 server_id=qtablewidgetitem(str(query.value(2)))                 server_pwd=qtablewidgetitem(str(query.value(3)))                 self.table.setitem(row,0,pid)                 self.table.setitem(row, 1, server_ip)                 self.table.setitem(row, 2, server_id)                 self.table.setitem(row, 3, server_pwd)                 row=row+1             self.db.close()         except:             qmessagebox.warning(self, "error", self.db.lasterror().text(), qmessagebox.discard)

i updated python 3.4, changed python 3.5, updated pyqt 5.4 5.6, , got error.

an error occurs in query part. errer message "python has stopped working."





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