def initUI(self):
  # Creating a window and other UI elements

  # A loop that creates 4 optionMenu items
  for i in range(0, 3):
      self.createMenu(i)

# a helper method that scopes the iterator variable inside itself
def createMenu(self, level):
  self.menus[level] = cmds.optionMenu(l="Menu"+str(level), cc=lambda x: self.indexFolders(x, level))