Unsupported operand type(s) for +: 'dict' and 'str'

import requests

from orionsdk import SwisClient

defmain():

  npm_server = '<ipaddress>'

  username = 'admin'

  password = '********'

  swis = SwisClient(npm_server, username, password)

   print("Custom Property Update Test:")

  results = swis.query("SELECT N.Uri FROM Orion.Nodes N INNER JOIN Orion.NodesCustomProperties AS I ON N.NodeID = I.NodeID WHERE I.Department=@department", department='IT')  # set valid NodeID!

   #print(results)

   for key in (results['results']):

   print("{Uri}".format(**key))

   #uri = "[{Uri}]"

  swis.update(key + '/CustomProperties', Department='Accounting')

  obj = swis.read(key + '/CustomProperties')

   print(obj.format(**key))

requests.packages.urllib3.disable_warnings()

if__name__ == '__main__':

  main()

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Hoping to receive feedback