import requests

endpoint = "http://192.168.122.162:7000/getip"
user = "testk"
password = "testk"
tenant = "testk"
subnet = "pro"
data = {'tenant': tenant, 'subnet': subnet}

r = requests.post(endpoint, auth=(user, password), data=data)

if 'data' in r.json():
    print r.json()['data']['ip']
else:
    print r.json()['error']['message']