Single Mobile Device Group?

How would I edit this script to only capture a single Mobile Device Group? I tried just editing line 119, which had a string for "/JSSResource/mobiledevices", but that didn't cut it. Here's the error I get...my guess (as a very, very poor coder) is that somehow I need to tell it to look farther than just the very top indent for "mobile_devices"

Getting device list from the JSS...
    Unexpected error obtaining Device List: (<class 'urllib2.URLError'>, URLError(error(111, 'Connection refused'),), <traceback object at 0x7fa737782c20>)
Traceback (most recent call last):
  File "updateUnresponsiveDeviceInventory.py", line 201, in <module>
    main()
  File "updateUnresponsiveDeviceInventory.py", line 99, in main
    devices=grabDeviceIDs()
  File "updateUnresponsiveDeviceInventory.py", line 106, in grabDeviceIDs
    for deviceListJSON in (getDeviceListFromJSS()["mobile_devices"]):
TypeError: 'NoneType' object has no attribute '__getitem__'

Thanks