2021 release notes

This page contains release notes for Streamlit versions released in 2021. For the latest version of Streamlit, see Release notes.

Version 1.3.0

Release date: Dec 16, 2021

Notable Changes

• 💯 Support for NumPy values in st.metric.
• 🌐 Support for Mesh Layers in PyDeck.
• 📊 Updated Plotly chart version to support the latest features.
• 🏀 st.spinner element has visual animated spinner.
• 🍰 st.caption supports HTML in text with unsafe_allow_html parameter.

Other Changes

• 🪲 Bug fix: Allow st.session_state to be used to set number_input values with no warning (#4047).
• 🪲 Bug fix: Fix footer alignment in wide mode (#4035).
• 🐞 Bug fix: Better support for Graphviz and Bokeh charts in containers (columns, expanders, etc.) (#4039).
• 🐞 Bug fix: Support inline data values in Vega-Lite (#4070).
• ✍️ Types: Updated type annotations for experimental memo and singleton decorators.
• ✍️ Types: Improved type annotations for st.selectbox, st.select_slider, st.radio, st.number_input, and st.multiselect.

Version 1.2.0

Release date: Nov 11, 2021

Notable Changes

• ✏️ st.text_input and st.text_area now have a placeholder parameter to display text when the field is empty.
• 📏 Viewers can now resize the input box in st.text_area.
• 📁 Streamlit can auto-reload when files in sub-directories change.
• 🌈 We've upgraded Bokeh support to 2.4.1! We recommend updating your Bokeh library to 2.4.1 to maintain functionality. Going forward, we'll let you know if there's a mismatch in your Bokeh version via an error prompt.
• 🔒 Developers can access secrets via attribute notation (e.g. st.secrets.key vs st.secrets["key"]) just like session state.
• ✍️ Publish type annotations according to PEP 561. Users now get type annotations for Streamlit when running mypy (#4025).

Other Changes

• 👀 Visual fixes (#3863, #3995, #3926, #3975).
• 🍔 Fixes to the hamburger menu (#3968).
• 🖨️ Ability to print session state (#3970).

Version 1.1.0

Release date: Oct 21, 2021

Highlights

• 🧠 Memory improvements: Streamlit apps allocate way less memory over time now.

Notable Changes

• ♻️ Apps automatically rerun now when the content of secrets.toml changes (before this you had to refresh the page manually).

Other Changes

• 🔗 Redirected some links to our brand-new docs site, e.g. in exceptions.
• 🪲 Bug fix: Allow initialization of range slider with session state (#3586).
• 🐞 Bug fix: Refresh chart when using add_rows with datetime index (#3653).
• ✍️ Added some more type annotation in our codebase (#3908).

Version 1.0.0

Release date: Oct 5, 2021

Highlights

• 🎈Announcing Streamlit 1.0! To read more about check out our 1.0 blog post.

Other Changes

• 🐞 Fixed an issue where using df.dtypes to show datatypes for a DF fails while using Arrow (#3709), Image captions stay within image width and are readable (#3530).

Version 0.89.0

Release date: Sep 22, 2021

Highlights

• 💰 Introducing st.experimental_memo and experimental_singleton, a new primitive for caching! See our blog post.
• 🍔 Streamlit allows developers to configure their hamburger menu to be more user-centric.

Notable Changes

• 💅 We updated our UI to a more polished look with a new font.
• 🎨 We now support theme.base in the theme object when it's sent to custom components.
• 🧠 We've modified session state to reset widgets if any of their arguments changed even if they provide a key.
  • Some widget behavior may have changed, but we believe this change makes the most sense. We have added a section to our documentation describing how they behave.

Other Changes

• 🐞 Bug fixes: Support svgs from a URL (#3809) and that do not start with <svg> tag (#3789).

Version 0.88.0

Release date: Sep 2, 2021

Highlights

• ⬇️ Introducing st.download_button, a new button widget for easily downloading files.

Notable Changes

• 🛑 We made changes to improve the redacted exception experience on Streamlit Community Cloud. When client.showErrorDetails=true exceptions display the Error Type and the Traceback, but redact the actual error text to prevent data leaks.

Version 0.87.0

Release date: Aug 19, 2021

Highlights

• 🔢 Introducing st.metric, an API for displaying KPIs. Check out the demo app showcasing the functionality.

Other Changes

• 🐞 Bug Fixes: File uploader retains state upon expander closing (#3557), setIn Error with st.empty (#3659), Missing IFrame embeds in docs (#3706), Fix error writing certain PNG files (#3597).

Version 0.86.0

Release date: Aug 5, 2021

Highlights

• 🎓 Our layout primitives are graduating from beta! You can now use st.columns, st.container and st.expander without the beta_ prefix.

Notable Changes

• 📱 When using st.columns, columns will stack vertically when viewport size <640px so that column layout on smaller viewports is consistent and cleaner. (#3594).

Other Changes

• 🐞 Bug fixes: Fixed st.date_input crashes if its empty (#3194), Opening files with utf-8(#3022), st.select_slider resets its state upon interaction (#3600).

Version 0.85.0

Release date: Jul 22, 2021

Highlights

• 🏹 Streamlit now uses Apache Arrow for serializing data frames when they are sent from Streamlit server to the front end. See our blog post.
  • (Users who wish to continue using the legacy data frame serialization can do so by setting the dataFrameSerialization config option to "legacy" in their config.toml).

Other Changes

• 🐞 Bug fixes: Unresponsive pydeck example (#3395), JSON parse error message (#2324), Tooltips rendering (#3300), Colorpicker not working on Streamlit Sharing (#2689).

Version 0.84.0

Release date: Jul 1, 2021

Highlights

• 🧠 Introducing st.session_state and widget callbacks to allow you to add statefulness to your apps. Check out the blog post

Notable Changes

• 🪄 st.text_input now has an autocomplete parameter to allow password managers to be used

Other Changes

• Using st.set_page_config to assign the page title no longer appends "Streamlit" to that title (#3467)
• NumberInput: disable plus/minus buttons when the widget is already at its max (or min) value (#3493)

Version 0.83.0

Release date: Jun 17, 2021

Highlights

• 🛣️ Updates to Streamlit docs to include step-by-step guides which demonstrate how to connect Streamlit apps to various databases & APIs

Notable Changes

• 📄 st.form now has a clear_on_submit parameter which "resets" all the form's widgets when the form is submitted.

Other Changes

• Fixed bugs regarding file encodings (#3320, #3108, #2731)

Version 0.82.0

Release date: May 13, 2021

Notable Changes

• ♻️ Improvements to memory management by forcing garbage collection between script runs.

Version 0.81.1

Release date: Apr 29, 2021

Highlights

• 📝 Introducing st.form and st.form_submit_button to allow you to batch input widgets. Check out our blog post
• 🔤 Introducing st.caption so you can add explainer text anywhere in you apps.
• 🎨 Updates to Theming, including ability to build a theme that inherits from any of our default themes.
• 🚀 Improvements to deployment experience to Streamlit sharing from the app menu.

Other changes

• Support for binary files in Custom Components (#3144)

Version 0.80.0

Release date: Apr 8, 2021

Highlights

• 🔐 Streamlit now support Secrets management for apps deployed to Streamlit Sharing!
• ⚓️ Titles and headers now come with automatically generated anchor links. Just hover over any title and click the 🔗 to get the link!

Other changes

• Added allow-downloads capability to custom components (#3040)
• Fixed markdown tables in dark theme (#3020)
• Improved color picker widget in the Custom Theme dialog (#2970)

Version 0.79.0

Release date: Mar 18, 2021

Highlights

• 🌈 Introducing support for custom themes. Check out our blog post
• 🌚 This release also introduces dark mode!
• 🛠️ Support for tooltips on all input widgets

Other changes

• Fixed bugs regarding file encodings (#1936, #2606) and caching functions (#2728)

Version 0.78.0

Release date: Mar 4, 2021

Features

• If you're in the Streamlit for Teams beta, we made a few updates to how secrets work. Check the beta docs for more info!
• Dataframes now displays timezones for all DateTime and Time columns, and shows the time with the timezone applied, rather than in UTC

Notable Bug Fixes

• Various improvement to column alignment in st.beta_columns
• Removed the long-deprecated format param from st.image, and replaced with output_format.

Version 0.77.0

Release date: Feb 23, 2021

Features

• Added a new config option client.showErrorDetails allowing the developer to control the granularity of error messages. This is useful for when you deploy an app, and want to conceal from your users potentially-sensitive information contained in tracebacks.

Notable bug fixes

• Fixed bug where st.image wasn't rendering certain kinds of SVGs correctly.
• Fixed regression where the current value of an st.slider was only shown on hover.

Version 0.76.0

Release date: February 4, 2021

Notable Changes

• 🎨 st.color_picker is now out of beta. This means the old beta_color_picker function, which was marked as deprecated for the past 3 months, has now been replaced with color_picker.
• 🐍 Display a warning when a Streamlit script is run directly as python script.py.
• st.image's use_column_width now defaults to an auto option which will resize the image to the column width if the image exceeds the column width.
• ✂️ Fixed bugs (2437 and 2247) with content getting cut off within a st.beta_expander
• 📜 Fixed a bug in st.dataframe where the scrollbar overlapped with the contents in the last column.
• 💾 Fixed a bug for st.file_uploader where file data returned was not the most recently uploaded file.
• ➕ Fixed bugs (2086 and 2556) where some LaTeX commands were not rendering correctly.

Version 0.75.0

Release date: January 21, 2021

Notable Changes

• 🕳 st.empty previously would clear the component at the end of the script. It has now been updated to clear the component instantly.
• 🛹 Previously in wide mode, we had thin margins around the webpage. This has now been increased to provide a better visual experience.

Version 0.74.0

Release date: January 6, 2021

Notable Changes

• 💾 st.file_uploader. has been stabilized and the deprecation warning and associated configuration option (deprecation.showfileUploaderEncoding) has been removed.
• 📊 st.bokeh_chart is no longer duplicated when the page loads.
• 🎈 Fixed page icon to support emojis with variants (i.e. 🤦‍♀️ vs 🤦🏼‍♀️) or dashes (i.e 🌙 - crescent-moon).

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