import requests, json
jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'qwer',
'method':'aria2.addUri',
'params':[['http://example.org'], dict(out='/mnt/c/data/stratplan/files/28252351/739 \u043e\u0442 18.12.2015 \u041e\u0434\u043e\u0431\u0440\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0433\u043d\u043e\u0437\u0430.doc')]})
c = requests.post('http://localhost:6800/jsonrpc', jsonreq)
data = c.text
print(data)