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st.warning

Display warning message.

Function signature[source]

st.warning(body, *, icon=None, width="stretch")

Parameters

body (str)

The text to display as GitHub-flavored Markdown. Syntax information can be found at: https://github.github.com/gfm.

See the body parameter of st.markdown for additional, supported Markdown directives.

icon (str, None)

An optional emoji or icon to display next to the alert. If icon is None (default), no icon is displayed. If icon is a string, the following options are valid:

  • A single-character emoji. For example, you can set icon="🚨" or icon="🔥". Emoji short codes are not supported.

  • An icon from the Material Symbols library (rounded style) in the format ":material/icon_name:" where "icon_name" is the name of the icon in snake case.

    For example, icon=":material/thumb_up:" will display the Thumb Up icon. Find additional icons in the Material Symbols font library.

width ("stretch" or int)

The width of the warning element. This can be one of the following:

  • "stretch" (default): The width of the element matches the width of the parent container.
  • An integer specifying the width in pixels: The element has a fixed width. If the specified width is greater than the width of the parent container, the width of the element matches the width of the parent container.

Example

import streamlit as st

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