title: PyQt5 - Signal : pyqtSignal no method connect
body: <p>following example in this doc found on <a href="http://pyqt.sourceforge.net/Docs/PyQt5/signals_slots.html#PyQt5.QtCore.pyqtSlot" rel="noreferrer">sourceforge</a>
  I faced an error.</p>
  
  <pre><code>from PyQt5.QtCore import pyqtSignal, pyqtSlot
  
   def setSignal():        
       signal = pyqtSignal()
       signal.connect(self.myAction)
  
   @QtCore.pyqtSlot()
   def myAction():
       print("signal triggered")
  </code></pre>
  
  <p>results in</p>
  
  <pre><code>AttributeError: 'PyQt5.QtCore.pyqtSignal' object has no attribute 'connect'
  </code></pre>