Control flow

Change execution

By default, Streamlit apps execute the script entirely, but we allow some functionality to handle control flow in your applications.

st.stop()

st.experimental_rerun()

Group multiple widgets

By default, Streamlit reruns your script everytime a user interacts with your app. However, sometimes it's a better user experience to wait until a group of related widgets is filled before actually rerunning the script. That's what st.form is for!

with st.form(key="my_form"):
    username = st.text_input("Username")
    password = st.text_input("Password")
    st.form_submit_button("Login")

with st.form(key="my_form"):
    username = st.text_input("Username")
    password = st.text_input("Password")
    st.form_submit_button("Login")

Third-party components

These are featured components created by our lovely community. If you don't see what you're looking for, check out our Components Hub app and Streamlit Extras for more examples and inspiration!

Autorefresh

Force a refresh without tying up a script. Created by @kmcgrady.

from streamlit_autorefresh import st_autorefresh

st_autorefresh(interval=2000, limit=100,
  key="fizzbuzzcounter")

Pydantic

Auto-generate Streamlit UI from Pydantic Models and Dataclasses. Created by @lukasmasuch.

import streamlit_pydantic as sp

sp.pydantic_form(key="my_form",
  model=ExampleModel)

Streamlit Pages

An experimental version of Streamlit Multi-Page Apps. Created by @blackary.

from st_pages import Page, show_pages, add_page_title

show_pages([ Page("streamlit_app.py", "Home", "🏠"),
  Page("other_pages/page2.py", "Page 2", ":books:"), ])