[PyQt] auto-connected slots (QAction.triggered) seem to be connected twice

[Alan Ezust]

I just tried creating a QMainWindow app with Designer integration and I
wanted to
use an auto-connected slot. I am attaching the code here.
The signal is emitted only once, I can see but the auto-connected slot is
called twice for each trigger of the action.

I reproduced this in PtQt 5.2.1 as well as PyQt 3.4.2 on windows 7.
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__author__ = 'aezust'

from PyQt5.QtWidgets import QMainWindow, QApplication, QFileDialog

from ui_mainwindow import Ui_MainWindow

class MainWindow(QMainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
        self.ui.actionOpen.triggered.connect(self.other_open)

    def other_open(self):
        print ("Other Open!!")

    def on_actionOpen_triggered(self, extraObj = True):
        print ("Open FIle!!")
        #QFileDialog.getOpenFileName(self, "Caption", 'c:/users/aezust')



if __name__ == "__main__":
    import sys
    app =QApplication(sys.argv)
    mw = MainWindow()
    mw.show()
    sys.exit(app.exec())
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<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>600</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Text Editor</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <layout class="QVBoxLayout" name="verticalLayout">
    <item>
     <widget class="QTextEdit" name="textEdit"/>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>21</height>
    </rect>
   </property>
   <widget class="QMenu" name="menuFile">
    <property name="title">
     <string>File</string>
    </property>
    <addaction name="actionOpen"/>
    <addaction name="actionSave"/>
    <addaction name="actionSave_As"/>
    <addaction name="actionClose"/>
    <addaction name="actionQuit"/>
   </widget>
   <widget class="QMenu" name="menuEdit">
    <property name="title">
     <string>Edit</string>
    </property>
   </widget>
   <widget class="QMenu" name="menuView">
    <property name="title">
     <string>View</string>
    </property>
    <addaction name="actionShow_Hidden"/>
   </widget>
   <widget class="QMenu" name="menuTools">
    <property name="title">
     <string>Tools</string>
    </property>
   </widget>
   <widget class="QMenu" name="menuHelp">
    <property name="title">
     <string>Help</string>
    </property>
    <addaction name="actionAbout_Qt"/>
   </widget>
   <addaction name="menuFile"/>
   <addaction name="menuEdit"/>
   <addaction name="menuView"/>
   <addaction name="menuTools"/>
   <addaction name="menuHelp"/>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
  <action name="actionSave">
   <property name="text">
    <string>Save</string>
   </property>
  </action>
  <action name="actionSave_As">
   <property name="text">
    <string>Save As ...</string>
   </property>
  </action>
  <action name="actionClose">
   <property name="text">
    <string>Close</string>
   </property>
  </action>
  <action name="actionQuit">
   <property name="text">
    <string>Quit</string>
   </property>
  </action>
  <action name="actionShow_Hidden">
   <property name="checkable">
    <bool>true</bool>
   </property>
   <property name="text">
    <string>Show Hidden</string>
   </property>
  </action>
  <action name="actionAbout_Qt">
   <property name="text">
    <string>About Qt</string>
   </property>
  </action>
  <action name="actionOpen">
   <property name="text">
    <string>Open</string>
   </property>
  </action>
 </widget>
 <resources/>
 <connections>
  <connection>
   <sender>actionQuit</sender>
   <signal>triggered()</signal>
   <receiver>MainWindow</receiver>
   <slot>close()</slot>
   <hints>
    <hint type="sourcelabel">
     <x>399</x>
     <y>299</y>
    </hint>
    <hint type="destinationlabel">
     <x>399</x>
     <y>299</y>
    </hint>
   </hints>
  </connection>
 </connections>
</ui>