# get json from odata endpoint and check for top-level "value" element...
try:
    http_response = requests.get( url )
except Exception as errmsg:
    sys.exit( "Error on http request ... Msg: " + str(errmsg) )

try:
    jsondata  = json.loads( http_response.text )   # works
    # jsondata = http_response.json                  # doesn't work
except Exception as errmsg:
    sys.exit( "Error on json conversion: " + str(errmsg) )

 try:
    rowset = jsondata["value"]
except Exception as errmsg:
    sys.exit( "ERROR .... can't find 'value'. Msg: " + str(errmsg) )

{"@odata.context":"http://xxx.yyy.org/JAXLIMS/Odata /$metadata#MPDInputs","@odata.count":27775,"value":[{"C_InputInstance_key":19203327,"InputValue":"129","InputName":"Experimenter", ....etc....