Extract and parse JSON Data with Python3

Question

I want to ask how to get the list IP Address in my getproject():

addresses={
  'int-ext': [
    {
      'version': 4,
      'addr': '192.168.1.201',
      'OS-EXT-IPS:type': 'fixed',
      'OS-EXT-IPS-MAC:mac_addr': 'fa:16:3e:e1:95:33'
    }
  ]
},
accessIPv4=,
accessIPv6=

and my code :

data = getproject()

for pj in project:
    for dt in data:
        if pj.project == dt["name"]:
            pj.addr = dt["addresses"]["int-ext"][0]["addr"]

I want to get the IP address and I try to print, but the output still "None" in running code . this code error when I run in python3