Method of implementing session_ids prior to v1.13, no longer works in 1.16

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Here you go – for version 1.20.0

from streamlit.runtime.scriptrunner import get_script_run_ctx
import streamlit as st

ctx = get_script_run_ctx()
session_id = ctx.session_id

You could also use one or more websocket headers as a proxy for session_id (perhaps Sec-Websocket-Key):

from streamlit.web.server.websocket_headers import _get_websocket_headers
import streamlit as st

headers = _get_websocket_headers()

session_id = headers.get("Sec-Websocket-Key")

if session_id is not None:
    # ... do something with session_id

See:

Different user incorrectly shared st.session_state;