Maya PySide- Tab as hotkey

from PySide import QtCore, QtGui
from shiboken import wrapInstance 
import maya.OpenMayaUI as mui

mainWin = wrapInstance(long(mui.MQtUtil.mainWindow()), QtGui.QWidget)

action = QtGui.QAction(mainWin)
action.setShortcut(QtGui.QKeySequence(QtCore.Qt.Key_Tab))
action.setShortcutContext(QtCore.Qt.ApplicationShortcut)

def foo():
    import mb_pandora_master
    reload(mb_pandora_master)
    mb_pandora_master.run()
    print "tabbed"
    
action.triggered.connect(foo)
mainWin.addAction(action)

pyside2_version.py

try:
	from PySide.QtCore import *
	from PySide.QtGui import *
	from PySide.QtWidgets import *
	import shiboken as shiboken
except:
	from PySide2.QtCore import *
	from PySide2.QtGui import *
	from PySide2.QtWidgets import *
	import shiboken2 as shiboken

import maya.OpenMayaUI as mui
import maya.cmds as mc

mainWin = shiboken.wrapInstance(long(mui.MQtUtil.mainWindow()), QWidget)

action = QAction(mainWin)
action.setShortcut(QKeySequence(Qt.Key_Tab))
action.setShortcutContext(Qt.ApplicationShortcut)

def foo():
    print "tabbed"
    
action.triggered.connect(foo)
mainWin.addAction(action)