title: PyQt5 returnPressed.connect "Cannot find reference 'connect' in function"
body: <p>Just a bit of a pedantic question, but I'm getting a &quot;Cannot find reference 'connect' in function&quot; warning in PyCharm. (Relating to my returnPressed.connect) Is it just a PyCharm bug or the function is deprecated, I couldn't find information on this online.</p>
  <p>I am only getting this .connect error on &quot;returnPressed&quot; all the rest are perfectly fine.
  It is my only warnings left and it bugs the hell out of me.</p>
  <pre><code>class Login(QWidget):
      switch_window = QtCore.pyqtSignal()
  
      def __init__(self):
          QtWidgets.QWidget.__init__(self)
          ...
  
          self.password = QLineEdit(self)
          self.password.setGeometry(QRect(50, 368, 200, 25))
          self.password.setFont(QtGui.QFont(&quot;Times&quot;, 13))
          self.password.setAlignment(QtCore.Qt.AlignCenter)
          self.password.setEchoMode(QLineEdit.Password)
          self.password.setStyleSheet(&quot;QLineEdit {border-radius: 10px}&quot;)
          self.password.setPlaceholderText(&quot;Password&quot;)
          self.password.returnPressed.connect(self.authenticate)
          ...
  
      def authenticate(self):
          ...
          self.switch_window.emit()
          ...
  </code></pre>