import win32com.client

xlApp =  win32com.client.DispatchEx('Excel.Application')
xlApp.Visible = True

objWkb = xlApp.Workbooks.Add()
objSht = objWkb.Worksheets(1)
objSht.Cells(2,2).Value = '1'
objSht.Cells(2,3).Value = '2'

range = objSht.Cells(2,4)
range.Value = '=%s+%s' % (objSht.Cells(2,2).Address, objSht.Cells(2,3).Address)
range.AddComment('Test Comment')

print range.Address
print range.Address(RowAbsolute=False, ColumnAbsolute=False)

objWkb.Close(SaveChanges=False) #to avoid prompt

xlApp.Quit()
xlApp.Visible = 0 #must make Visible=0 before del self.excelapp or EXCEL.EXE remains in memory.
del xlApp

range.GetAddress(RowAbsolute=False,ColumnAbsolute=False)

range.GetAddress()
range.Address