title: How to pass QLineEdit value to another function?
body: <p>I'm using Python 2.7 and PyQT4, I'm making a simple calculator, I have two <code>QLineEdit</code> and I have a function that prints the result of adding.</p>
  
  <pre><code>class Window(QtGui.QMainWindow):
      global number_1_text
      global number_2_text
  
      def __init__(self):
          super(Window, self).__init__()
          self.setWindowFlags(QtCore.Qt.WindowMinimizeButtonHint)
          #Main Window Settings
          self.setGeometry(50,50,500,300)
          self.setWindowTitle("Point of sale !")
          self.setWindowIcon(QtGui.QIcon('python.png'))
  
          #Close Action
          exitAction = QtGui.QAction(QtGui.QIcon('python.png'),"Close Now !", self)
          exitAction.setShortcut("Ctrl+Q")
          exitAction.setStatusTip('Leave the Application')
          exitAction.triggered.connect(self.close_application)
          self.statusBar()
  
          #Menubar
          mainMenu = self.menuBar()
          fileMenu = mainMenu.addMenu('&amp;File')
          fileMenu.addAction(exitAction)
  
  
          # Create textboxs
          number_1 = QtGui.QLineEdit(self)
          number_1.move(20, 50)
          number_1.resize(380,40)
          self.number_1_text = number_1.text()
  
          number_2 = QtGui.QLineEdit(self)
          number_2.move(20, 100)
          number_2.resize(380,40)
          self.number_2_text = number_2.text()
  
          #Main Home Proccess
          quiteBtn = QtGui.QPushButton("Quite", self)
          quiteBtn.resize(100, 50)
          quiteBtn.move(50,220)
          quiteBtn.clicked.connect(self.close_application)
  
          addBtn = QtGui.QPushButton("Add", self)
          addBtn.resize(100, 50)
          addBtn.move(150,220)
          addBtn.clicked.connect(self.addNumbers)
          self.show()
  
      def addNumbers(self):
          print self.number_1_text
          print self.number_2_text
          print "Done"
  
      #Close The Whole Application
      def close_application(self):
          choice = QtGui.QMessageBox.question(self, 'Exit !', 'Are you sure you wanna exit?',
              QtGui.QMessageBox.Yes | QtGui.QMessageBox.No
              )
          if choice == QtGui.QMessageBox.Yes:
              sys.exit()
          else:
              pass
  </code></pre>
  
  <p>I tried to get the values with <code>text()</code> function and assigned it to a global variable in the class, then I tried to call the values in <code>addNumbers</code> function but I get an empty value.</p>
  
  <p>A screenshot of the result:
  <a href="https://i.stack.imgur.com/1LXda.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1LXda.png" alt="Result"></a></p>