Display a button widget.

Function signature[source]

st.button(label, key=None, help=None, on_click=None, args=None, kwargs=None, *, type="secondary", disabled=False, use_container_width=False)


label (str)

A short label explaining to the user what this button is for. The label can optionally contain Markdown and supports the following elements: Bold, Italics, Strikethroughs, Inline Code, and Emojis.

This also supports:

  • Emoji shortcodes, such as :+1: and :sunglasses:. For a list of all supported codes, see https://share.streamlit.io/streamlit/emoji-shortcodes.
  • LaTeX expressions, by wrapping them in "$" or "$$" (the "$$" must be on their own lines). Supported LaTeX functions are listed at https://katex.org/docs/supported.html.
  • Colored text, using the syntax :color[text to be colored], where color needs to be replaced with any of the following supported colors: blue, green, orange, red, violet, gray/grey, rainbow.

Unsupported elements are unwrapped so only their children (text contents) render. Display unsupported elements as literal characters by backslash-escaping them. E.g. 1\. Not an ordered list.

key (str or int)

An optional string or integer to use as the unique key for the widget. If this is omitted, a key will be generated for the widget based on its content. Multiple widgets of the same type may not share the same key.

help (str)

An optional tooltip that gets displayed when the button is hovered over.

on_click (callable)

An optional callback invoked when this button is clicked.

args (tuple)

An optional tuple of args to pass to the callback.

kwargs (dict)

An optional dict of kwargs to pass to the callback.

type ("secondary" or "primary")

An optional string that specifies the button type. Can be "primary" for a button with additional emphasis or "secondary" for a normal button. Defaults to "secondary".

disabled (bool)

An optional boolean, which disables the button if set to True. The default is False.

use_container_width (bool)

An optional boolean, which makes the button stretch its width to match the parent container.



True if the button was clicked on the last run of the app, False otherwise.


import streamlit as st

st.button("Reset", type="primary")
if st.button('Say hello'):
    st.write('Why hello there')

Although a button is the simplest of input widgets, it's very common for buttons to be deeply tied to the use of st.session_state. Check out our advanced guide on Button behavior and examples.

Check out our video on how to use one of Streamlit's core functions, the button!

In the video below, we'll take it a step further and learn how to combine a button, checkbox and radio button!


Still have questions?

Our forums are full of helpful information and Streamlit experts.