Where/how can I get the execution results?

[hunkim]

I just wanted to execute a simple code and get execution results using ipykernel. My code is:

import jupyter_client

km, kc = jupyter_client.manager.start_new_kernel()
kc.execute('print("Hello")', silent=False)

state = 'busy'
while state != 'idle' and kc.is_alive():
    msg = kc.get_iopub_msg(timeout=100)

    if 'content' not in msg:
        continue

    content = msg['content']
    if 'execution_state' in content:
        state = content['execution_state']

    print("State:", state)

print(msg)

It prints out State: busy several times and prints msg in json:

{
    "buffers": [],
    "content": {
        "execution_state": "idle"
    },
    "header": {
        "date": "2019-09-14 13:43:15.474096+00:00",
        "msg_id": "3af15234-e916ebf72147aca0b8510300",
        "msg_type": "status",
        "session": "799a6df2-dc330c1b0c1f9c26e73f2f1c",
        "username": "hunkim",
        "version": "5.3"
    },
    "metadata": {},
    "msg_id": "3af15234-e916ebf72147aca0b8510300",
    "msg_type": "status",
    "parent_header": {
        "date": "2019-09-14 13:43:15.459643+00:00",
        "msg_id": "63800e8e-7bb0e5adbd460293c78f1913",
        "msg_type": "execute_request",
        "session": "1d8720b9-9550df1c20706078496c5e56",
        "username": "hunkim",
        "version": "5.3"
    }
}

Where can I find the execution result, in this case, "Hello"?

[hunkim]

I think I figured:

import jupyter_client

km, kc = jupyter_client.manager.start_new_kernel()
kc.execute('print("Hello")', silent=False)

state = 'busy'
while state != 'idle' and kc.is_alive():
    msg = kc.get_iopub_msg(timeout=100)

    if 'content' not in msg:
        continue

    content = msg['content']
    if 'execution_state' in content:
        state = content['execution_state']

    print("State:", state)
    print(msg)
    print("-----------")

I just moved the msg print inside of the loop, and it seems iopub_msg returns many messages with different msg_types.

State: busy
{
    "buffers": [],
    "content": {
        "execution_state": "busy"
    },
    "header": {
        "date": "2019-09-14 14:05:26.423761+00:00",
        "msg_id": "19cb5e65-c34282e1b236b21829d97945",
        "msg_type": "status",
        "session": "b7d68e6f-f6bb1275c46bd30b0785adc9",
        "username": "hunkim",
        "version": "5.3"
    },
    "metadata": {},
    "msg_id": "19cb5e65-c34282e1b236b21829d97945",
    "msg_type": "status",
    "parent_header": {
        "date": "2019-09-14 14:05:26.421658+00:00",
        "msg_id": "8f727fc4-4993d0fe523b711a0cd337bc",
        "msg_type": "execute_request",
        "session": "8ad0d17d-3ea420edc5ce7917caabfa3a",
        "username": "hunkim",
        "version": "5.3"
    }
}
-----------
State: busy
{
    "buffers": [],
    "content": {
        "code": "print(\"Hello\")",
        "execution_count": 1
    },
    "header": {
        "date": "2019-09-14 14:05:26.424613+00:00",
        "msg_id": "163a2eac-6aae88015f485383c48ee4db",
        "msg_type": "execute_input",
        "session": "b7d68e6f-f6bb1275c46bd30b0785adc9",
        "username": "hunkim",
        "version": "5.3"
    },
    "metadata": {},
    "msg_id": "163a2eac-6aae88015f485383c48ee4db",
    "msg_type": "execute_input",
    "parent_header": {
        "date": "2019-09-14 14:05:26.421658+00:00",
        "msg_id": "8f727fc4-4993d0fe523b711a0cd337bc",
        "msg_type": "execute_request",
        "session": "8ad0d17d-3ea420edc5ce7917caabfa3a",
        "username": "hunkim",
        "version": "5.3"
    }
}
-----------
State: busy
{
    "buffers": [],
    "content": {
        "name": "stdout",
        "text": "Hello\n"
    },
    "header": {
        "date": "2019-09-14 14:05:26.430333+00:00",
        "msg_id": "9e1a7fb8-7a761db798753b972d9346d9",
        "msg_type": "stream",
        "session": "b7d68e6f-f6bb1275c46bd30b0785adc9",
        "username": "hunkim",
        "version": "5.3"
    },
    "metadata": {},
    "msg_id": "9e1a7fb8-7a761db798753b972d9346d9",
    "msg_type": "stream",
    "parent_header": {
        "date": "2019-09-14 14:05:26.421658+00:00",
        "msg_id": "8f727fc4-4993d0fe523b711a0cd337bc",
        "msg_type": "execute_request",
        "session": "8ad0d17d-3ea420edc5ce7917caabfa3a",
        "username": "hunkim",
        "version": "5.3"
    }
}
-----------
State: idle
{
    "buffers": [],
    "content": {
        "execution_state": "idle"
    },
    "header": {
        "date": "2019-09-14 14:05:26.433756+00:00",
        "msg_id": "3c0c2acd-25af58d170262bc57fbf5a33",
        "msg_type": "status",
        "session": "b7d68e6f-f6bb1275c46bd30b0785adc9",
        "username": "hunkim",
        "version": "5.3"
    },
    "metadata": {},
    "msg_id": "3c0c2acd-25af58d170262bc57fbf5a33",
    "msg_type": "status",
    "parent_header": {
        "date": "2019-09-14 14:05:26.421658+00:00",
        "msg_id": "8f727fc4-4993d0fe523b711a0cd337bc",
        "msg_type": "execute_request",
        "session": "8ad0d17d-3ea420edc5ce7917caabfa3a",
        "username": "hunkim",
        "version": "5.3"
    }
}
-----------

Should I check all the messages and their message type to get execution results?