Insert a multi-element container that can be expanded/collapsed.

Inserts a container into your app that can be used to hold multiple elements and can be expanded or collapsed by the user. When collapsed, all that is visible is the provided label.

To add elements to the returned container, you can use "with" notation (preferred) or just call methods directly on the returned object. See examples below.

Warning

Currently, you may not put expanders inside another expander.

Function signature

st.expander(label, expanded=False)

Parameters

label (str)

A string to use as the header for the expander. The label can optionally contain Markdown and supports the following elements: Bold, Italics, Strikethroughs, Inline Code, Emojis, and Links.

expanded (bool)

If True, initializes the expander in "expanded" state. Defaults to False (collapsed).

Examples

You can use with notation to insert any element into an expander

import streamlit as st

st.bar_chart({"data": [1, 5, 2, 6, 2, 1]})

with st.expander("See explanation"):
    st.write(\"\"\"
        The chart above shows some numbers I picked for you.
        I rolled actual dice for these, so they're *guaranteed* to
        be random.
    \"\"\")
    st.image("https://static.streamlit.io/examples/dice.jpg")
(view standalone Streamlit app)

Or you can just call methods directly in the returned objects:

import streamlit as st

st.bar_chart({"data": [1, 5, 2, 6, 2, 1]})

expander = st.expander("See explanation")
expander.write(\"\"\"
    The chart above shows some numbers I picked for you.
    I rolled actual dice for these, so they're *guaranteed* to
    be random.
\"\"\")
expander.image("https://static.streamlit.io/examples/dice.jpg")
(view standalone Streamlit app)

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