Maya - PySide - Menu Section.py

# third party libraries
import pymel.core as pm
from PySide import QtGui

menus = [i for i in sorted(pm.lsUI(menus=True)) if isinstance(i.getParent(), pm.ui.Window) and isinstance(i, pm.ui.Menu)]

for i in sorted(menus):
    if i.shortName() == "Test":
        i.delete()
        
test = pm.menu("Test", parent=pm.MelGlobals()["gMainWindow"]).asQtObject()

class Section(QtGui.QWidgetAction):
    def __init__(self, title, parent=None):
        super(Section, self).__init__(parent)
        self.setText(title)
        self.setSeparator(True)

test.addAction(Section("Bar", test))
test.addMenu("FOOBAR")

test.addAction(Section("Fizz", test))
test.addMenu("FIZZBAZZ")