Hack to get a session-specific ID in Streamlit. See https://discuss.streamlit.io/t/session-specific-caching/271

session_id.py

import streamlit.ReportThread as ReportThread
from streamlit.server.Server import Server


def get_session_id():
    # Hack to get the session object from Streamlit.

    ctx = ReportThread.get_report_ctx()

    this_session = None
    
    current_server = Server.get_current()
    if hasattr(current_server, '_session_infos'):
        # Streamlit < 0.56        
        session_infos = Server.get_current()._session_infos.values()
    else:
        session_infos = Server.get_current()._session_info_by_id.values()

    for session_info in session_infos:
        s = session_info.session
        if (
            # Streamlit < 0.54.0
            (hasattr(s, '_main_dg') and s._main_dg == ctx.main_dg)
            or
            # Streamlit >= 0.54.0
            (not hasattr(s, '_main_dg') and s.enqueue == ctx.enqueue)
        ):
            this_session = s

    if this_session is None:
        raise RuntimeError(
            "Oh noes. Couldn't get your Streamlit Session object"
            'Are you doing something fancy with threads?')

    return id(this_session)

I have used this for version 1.22.0 @akaJasonK

from streamlit.runtime.scriptrunner.script_run_context import get_script_run_ctx
ctx = get_script_run_ctx()
print(ctx.session_id)