Streamlit: Powerful open-source Python library

Back Streamlit: Powerful open-source Python library 24 Jul, 2025

ABHISHEK AGNIHOTRI

Streamlit is a powerful open-source Python library that turns scripts into interactive web apps for data science and machine learning projects. It offers a wide range of functions to build interactive UI elements, display data, integrate media, and manage layouts. Below is a categorized list of important Streamlit functions:

🔹 1. Display Functions

Used to display text, data, code, and other elements.

Function	Purpose
`st.title()`	Display a large title
`st.header()`	Display a header
`st.subheader()`	Display a subheader
`st.text()`	Display fixed text
`st.markdown()`	Render Markdown-formatted text
`st.code()`	Show code block
`st.latex()`	Render LaTeX expressions
`st.write()`	Generic write for any object (text, dataframe, plot, etc.)

🔹 2. Widgets (User Inputs)

Create interactive widgets to receive user inputs.

Function	Input Type
`st.button()`	Button
`st.checkbox()`	Boolean
`st.radio()`	Select one from multiple options
`st.selectbox()`	Dropdown menu
`st.multiselect()`	Multiple dropdown options
`st.slider()`	Range slider
`st.text_input()`	Text input
`st.text_area()`	Multi-line text input
`st.number_input()`	Numeric input
`st.date_input()`	Date picker
`st.time_input()`	Time picker
`st.file_uploader()`	File uploader
`st.color_picker()`	Color picker

🔹 3. Media Functions

Display multimedia elements.

Function	Media Type
`st.image()`	Display image
`st.audio()`	Play audio
`st.video()`	Play video

🔹 4. Data Display

Display structured data.

Function	Description
`st.dataframe()`	Interactive table
`st.table()`	Static table
`st.json()`	Render JSON
`st.metric()`	Display a metric (e.g., KPI)

🔹 5. Charts & Plots

Visualize data.

Function	Chart Type
`st.line_chart()`	Line chart
`st.area_chart()`	Area chart
`st.bar_chart()`	Bar chart
`st.pyplot()`	Matplotlib
`st.altair_chart()`	Altair
`st.vega_lite_chart()`	Vega-Lite
`st.plotly_chart()`	Plotly
`st.bokeh_chart()`	Bokeh
`st.graphviz_chart()`	Graphviz diagrams
`st.map()`	Map visualization

🔹 6. Layout and Containers

Manage layout and custom UI flow.

Function	Description
`st.sidebar`	Add widgets to sidebar
`st.columns()`	Divide page into columns
`st.container()`	Custom containers
`st.expander()`	Collapsible section
`st.empty()`	Placeholder for dynamic updates
`st.tabs()`	Tabbed layout
`st.spinner()`	Show loading spinner
`st.toast()`	Show temporary message (new)

🔹 7. Control Flow and Utilities

Control app behavior.

Function	Description
`st.cache_data()`	Cache data (e.g., API or computation)
`st.cache_resource()`	Cache models, connections
`st.session_state`	Manage state between reruns
`st.experimental_rerun()`	Force rerun
`st.stop()`	Stop execution
`st.form()` / `st.form_submit_button()`	Group widgets in a form

🔹 8. File & Download Management

Allow file download or read.

Function	Description
`st.file_uploader()`	Upload file(s)
`st.download_button()`	Provide download link for file or text

🔹 9. Theming and Configuration

Customize appearance and behavior.

Function	Description
`st.set_page_config()`	Set page title, layout, icon, etc.
`.streamlit/config.toml`	Persistent app config