python/gui question

Thu Mar 9 14:15:18 EST 2017

i want to create a very simple python plugin using QT designer but i an not sure how to connect my variable from gui to my python script.
my gui is simple have only one lineEdit and ok or cancel.
in the gui (widget):
 <widget class="QLineEdit" name="lineEdit">
 <property name="geometry">
 <rect>
 <x>20</x>
 <y>90</y>
 <width>171</width>
 <height>31</height>
 </rect>
 </property>
 </widget>
def run(self):
 self.dlg.show()
 result = self.dlg.exec_()
 if result:
 distance = self.dlg.lineEdit.value()
 if distance == 0:
 #do something
 else:
 #do sothing else
 pass
i test this code but dont work dont show me anything. any idea ?