from jsonrpc.client import Client


request = {
    "jsonrpc": "2.0",
    "method": "app.endpoint",
    "params": {"a": 1, "b": 2},
    "id": "1"
}

client = Client('http://127.0.0.1:5000/api')
response = client(request)

assert 'result' in response, response['error']['message']
if 'result' in response:
    print(response['result'])
elif 'error' in response:
    print(response['result'])
print(response)