title: PyQt5: Update labels inrun time
body: <p>I have a problem updating labels in a loop during run time. I think I need to use signals and so on, but I've tried everything I can think of now. What I want my program to do:</p>
  
  <p>When I click the button a loop should start that run some function that take some time. While the function is running the corresponding label should update its text to say "running" and when its done it should say "done" and continue to the next function. I've created some dummy code that represent what I'm after!</p>
  
  <p>I have represented my function with a dummy function that just take some time.</p>
  
  <pre><code>import sys
  from PyQt5.QtWidgets import *
  import time
  
  class Example(QWidget):
  
      def __init__(self):
          super().__init__()
  
          self.initUI()
  
  
      def initUI(self):
          # Set up an example ui
          qbtn = QPushButton('Click', self)
          qbtn.clicked.connect(self.changeLabels)
          qbtn.resize(qbtn.sizeHint())
          qbtn.move(100, 50)
          # Add labels
          self.labels = list()
          self.labels.append(QLabel("Lbl1", self))
          self.labels[-1].setFixedSize(50, 20)
          self.labels.append(QLabel("Lbl2", self))
          self.labels[-1].setFixedSize(50, 20)
          self.labels[-1].move(0, 20)
          self.labels.append(QLabel("Lbl3", self))
          self.labels[-1].setFixedSize(50, 20)
          self.labels[-1].move(0, 40)
  
          self.setGeometry(300, 300, 250, 150)
          self.setWindowTitle('Test')
          self.show()
  
      def changeLabels(self):
          # Loop over all labels. For each label a function will be executed that will take some time. In this case
          # I represent that with a dummy function to just take time. While the function is running the label should say
          # "running" and when its finished it should say "done".
          for lbl in self.labels:
              orgTxt = lbl.text()
              lbl.setText("%s Running" % orgTxt)
              self.dummyFunction()
              lbl.setText("%s Done" % orgTxt)
  
      def dummyFunction(self):
          time.sleep(1)
  
  
  if __name__ == '__main__':
      app = QApplication(sys.argv)
      ex = Example()
      sys.exit(app.exec_())
  </code></pre>