import requests
import json
headers = {'content-type': 'application/json'}
url = 'http://192.168.3.45:8080/api/v2/event/log'
data = {'eventType': 'AAS_PORTAL_START', 'data': {'uid': 'hfe3hf45huf33545',
    'aid': '1', 'vid': '1'}}
params = {'sessionKey': '9ebbd0b25760557393a43064a92bae539d962103',
    'format': 'xml', 'platformId': 1}
requests.post(url, params=params, data=json.dumps(data), headers=headers)
Python Request Post with param data