st.warning() in Streamlit

The warning method in Streamlit is used to display a warning message box, usually in yellow, to alert the user about potential issues, risky actions, or things to be cautious about — without stopping the app.

Syntax

st.warning(body, icon=None)

The function has the following parameters:

body: The warning message (string, Markdown text, or any supported Streamlit element).
icon: (optional) A custom emoji or icon. Default is None.

Example: Basic example.

Python

# Importing the Streamlit library
import streamlit as st

# Setting the title of the Streamlit app
st.title("Warning Message Example")

# Displaying a warning message
st.warning("Low disk space! Please free up some storage.")

# You can also add a custom icon to the warning message by using the icon parameter.
st.warning("This is a warning message!", icon="⚠️")

The output of the above code is shown below:

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