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You are reading the documentation for Streamlit version 1.22.0, but 1.45.0 is the latest version available.

st.warning

Display warning message.

Function signature[source]
st.warning(body, *, icon=None)
Parameters
body (str)	The warning text to display.
icon (str or None)	An optional, keyword-only argument that specifies an emoji to use as the icon for the alert. Shortcodes are not allowed, please use a single character instead. E.g. "🚨", "🔥", "🤖", etc. Defaults to None, which means no icon is displayed.

import streamlit as st

st.warning('This is a warning', icon="⚠️")

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