# 2020 release notes

Source: https://docs.streamlit.io/develop/quick-reference/release-notes/2020

This page contains release notes for Streamlit versions released in 2020. For the latest version of Streamlit, see [Release notes](https://docs.streamlit.io/develop/quick-reference/release-notes).

## Version 0.73.0

_Release date: December 17, 2020_

**Notable Changes**

- 🐍 Streamlit can now be installed on Python 3.9. Streamlit components are not
  yet compatible with Python 3.9 and must use version 3.8 or earlier.
- 🧱 Streamlit Components now allows same origin, enabling features provided by
  the browser such as a webcam component.
- 🐙 Fix Streamlit sharing deploy experience for users running on Git versions
  2.7.0 or earlier.
- 🧰 Handle unexpected closing of uploaded files for [`st.file_uploader`](https://docs.streamlit.io/en/0.72.0/api.html#streamlit.file_uploader).

## Version 0.72.0

_Release date: December 2, 2020_

**Notable Changes**

- 🌈 Establish a framework for theming and migrate existing components.
- 📱 Improve the sidebar experience for mobile devices.
- 🧰 Update [`st.file_uploader`](https://docs.streamlit.io/en/0.71.0/api.html#streamlit.file_uploader) to reduce reruns.

## Version 0.71.0

_Release date: November 11, 2020_

**Notable Changes**

- 📁 Updated [`st.file_uploader`](https://docs.streamlit.io/en/0.71.0/api.html#streamlit.file_uploader)
  to automatically reset buffer on app reruns.
- 📊 Optimize the default rendering of charts and reduce issues with the initial render.

## Version 0.70.0

_Release date: October 28, 2020_

**Notable Changes**

- 🧪 [`st.set_page_config`](https://docs.streamlit.io/en/0.70.0/api.html#streamlit.set_page_config) and [`st.color_picker`](https://docs.streamlit.io/en/0.70.0/api.html#streamlit.color_picker) have now been moved into the
  Streamlit namespace. These will be removed from beta January 28th, 2021. Learn
  more about our beta process [here](https://docs.streamlit.io/en/0.70.0/api.html#beta-and-experimental-features).
- 📊 Improve display of bar charts for discrete values.

## Version 0.69.0

_Release date: October 15, 2020_

**Highlights:**

- 🎁 Introducing Streamlit sharing, the best way to deploy, manage, and share your public Streamlit apps—for free. Read more about it on our [blog post](http://blog.streamlit.io/introducing-streamlit-sharing/) or sign up [here](https://streamlit.io/sharing)!
- Added `st.experimental_rerun` to programatically re-run your app. Thanks [SimonBiggs](https://github.com/SimonBiggs)!

**Notable Changes**

- 📹 Better support across browsers for start and stop times for st.video.
- 🖼 Bug fix for intermittently failing media files
- 📦 Bug fix for custom components compatibility with Safari. Make sure to upgrade to the latest [streamlit-component-lib](https://www.npmjs.com/package/streamlit-component-lib).

## Version 0.68.0

_Release date: October 8, 2020_

**Highlights:**

- ⌗ Introducing new layout options for Streamlit! Move aside, vertical layout.
  Make a little space for... horizontal layout! Check out our
  [blog post](https://blog.streamlit.io/introducing-new-layout-options-for-streamlit/).
- 💾 File uploader redesigned with new functionality for multiple files uploads
  and better support for working with uploaded files. This may cause breaking
  changes. Please see the new api in our
  [documentation](https://docs.streamlit.io/en/0.68.0/api.html#streamlit.file_uploader)

**Notable Changes**

- 🎈 `st.balloon` has gotten a facelift with nicer balloons and smoother animations.
- 🚨 Breaking Change: Following the deprecation of `st.deck_gl_chart` in
  January 2020, we have now removed the API completely. Please use
  `st.pydeck_chart` instead.
- 🚨 Breaking Change: Following the deprecation of `width` and `height` for
  `st.altair_chart`, `st.graphviz_chart`, `st.plotly_chart`, and
  `st.vega_lite_chart` in January 2020, we have now removed the args completely.
  Please set the width and height in the respective charting library.

## Version 0.67.0

_Release date: September 16, 2020_

**Highlights:**

- 🦷 Streamlit Components can now return bytes to your Streamlit App. To create a
  component that returns bytes, make sure to upgrade to the latest
  [streamlit-component-lib](https://www.npmjs.com/package/streamlit-component-lib).

**Notable Changes**

- 📈 Deprecation warning: Beginning December 1st, 2020 `st.pyplot()` will require a figure to
  be provided. To disable the deprecation warning, please set `deprecation.showPyplotGlobalUse`
  to `False`
- 🎚 `st.multiselect` and `st.select` are now lightning fast when working with large datasets. Thanks [masa3141](https://github.com/masa3141)!

## Version 0.66.0

_Release date: September 1, 2020_

**Highlights:**

- ✏️ `st.write` is now available for use in the sidebar!
- 🎚 A slider for distinct or non-numerical values is now available with `st.select_slider`.
- ⌗ Streamlit Components can now return dataframes to your Streamlit App. Check out our [SelectableDataTable example](https://github.com/streamlit/component-template/tree/master/examples/SelectableDataTable).
- 📦 The Streamlit Components library used in our Streamlit Component template is
  now available as a npm package ([streamlit-component-lib](https://www.npmjs.com/package/streamlit-component-lib)) to simplify future upgrades to the latest version.
  Existing components do not need to migrate.

**Notable Changes**

- 🐼 Support StringDtype from pandas version 1.0.0
- 🧦 Support for running Streamlit on Unix sockets

## Version 0.65.0

_Release date: August 12, 2020_

**Highlights:**

- ⚙️ Ability to set page title, favicon, sidebar state, and wide mode via st.beta_set_page_config(). See our [documentation](https://docs.streamlit.io/en/0.65.0/api.html#streamlit.set_page_config) for details.
- 📝 Add stateful behaviors through the use of query parameters with st.experimental_set_query_params and st.experimental_get_query_params. Thanks [@zhaoooyue](https://github.com/zhaoooyue)!
- 🐼 Improved pandas dataframe support for st.radio, st.selectbox, and st.multiselect.
- 🛑 Break out of your Streamlit app with st.stop.
- 🖼 Inline SVG support for st.image.

**Callouts:**

- 🚨Deprecation Warning: The st.image parameter format has been renamed to output_format.

## Version 0.64.0

_Release date: July 23, 2020_

**Highlights:**

- 📊 Default matplotlib to display charts with a tight layout. To disable this,
  set `bbox_inches` to `None`, inches as a string, or a `Bbox`
- 🗃 Deprecation warning for automatic encoding on `st.file_uploader`
- 🙈 If `gatherUserStats` is `False`, do not even load the Segment library.
  Thanks [@tanmaylaud](https://github.com/tanmaylaud)!

## Version 0.63.0

_Release date: July 13, 2020_

**Highlights:**

- 🧩 **Support for Streamlit Components!!!** See
  [documentation](https://docs.streamlit.io/en/latest/streamlit_components.html) for more info.
- 🕗 Support for datetimes in
  [`st.slider`](https://docs.streamlit.io/en/latest/api.html#streamlit.slider). And, of course, just
  like any other value you use in `st.slider`, you can also pass in two-element lists to get a
  datetime range slider.

## Version 0.62.0

_Release date: June 21, 2020_

**Highlights:**

- 📨 Ability to turn websocket compression on/off via the config option
  `server.enableWebsocketCompression`. This is useful if your server strips HTTP headers and you do
  not have access to change that behavior.
- 🗝️ Out-of-the-box support for CSRF protection using the
  [Cookie-to-header token](https://en.wikipedia.org/wiki/Cross-site_request_forgery#Cookie-to-header_token)
  technique. This means that if you're serving your Streamlit app from multiple replicas you'll need
  to configure them to to use the same cookie secret with the `server.cookieSecret` config option.
  To turn XSRF protection off, set `server.enableXsrfProtection=false`.

**Notable bug fixes:**

- 🖼️ Added a grace period to the image cache expiration logic in order to fix multiple related bugs
  where images sent with `st.image` or `st.pyplot` were sometimes missing.

## Version 0.61.0

_Release date: June 2, 2020_

**Highlights:**

- 📅 Support for date ranges in `st.date_picker`. See
  [docs](https://docs.streamlit.io/en/latest/api.html#streamlit.date_picker)
  for more info, but the TLDR is: just pass a list/tuple as the default date and it will be
  interpreted as a range.
- 🗣️ You can now choose whether `st.echo` prints the code above or below the output of the echoed
  block. To learn more, refer to the `code_location` argument in the
  [docs](https://docs.streamlit.io/en/latest/api.html#streamlit.echo).
- 📦 Improved `@st.cache` support for Keras models and Tensorflow `saved_models`.

## Version 0.60.0

_Release date: May 18, 2020_

**Highlights:**

- ↕️ Ability to set the height of an `st.text_area` with the `height` argument
  (expressed in pixels). See
  [docs](https://docs.streamlit.io/en/latest/api.html#streamlit.text_area) for more.
- 🔡 Ability to set the maximimum number of characters allowed in `st.text_area`
  or `st.text_input`. Check out the `max_chars` argument in the
  [docs](https://docs.streamlit.io/en/latest/api.html#streamlit.text_area).
- 🗺️ Better DeckGL support for the [H3](https://h3geo.org/) geospatial indexing
  system. So now you can use things like `H3HexagonLayer` in
  [`st.pydeck_chart`](https://docs.streamlit.io/en/latest/api.html#streamlit.pydeck_chart).
- 📦 Improved `@st.cache` support for PyTorch TensorBase and Model.

## Version 0.59.0

_Release date: May 05, 2020_

**Highlights:**

- 🎨 New color-picker widget! Use it with
  [`st.beta_color_picker()`](https://docs.streamlit.io/en/0.69.0/api.html#streamlit.beta_color_picker)
- 🧪 Introducing `st.beta_*` and `st.experimental_*` function prefixes, for faster
  Streamlit feature releases. See
  [docs](https://docs.streamlit.io/en/latest/api.html#pre-release-features) for more info.
- 📦 Improved `@st.cache` support for SQL Alchemy objects, CompiledFFI, PyTorch
  Tensors, and `builtins.mappingproxy`.

## Version 0.58.0

_Release date: April 22, 2020_

**Highlights:**

- 💼 Made `st.selectbox` filtering case-insensitive.
- ㈬ Better support for Tensorflow sessions in `@st.cache`.
- 📊 Changed behavior of `st.pyplot` to auto-clear the figure only when using
  the global Matplotlib figure (i.e. only when calling `st.pyplot()` rather
  than `st.pyplot(fig)`).

## Version 0.57.0

_Release date: March 26, 2020_

**Highlights:**

- ⏲️ Ability to set expiration options for `@st.cache`'ed functions by setting
  the `max_entries` and `ttl` arguments. See
  [docs](https://docs.streamlit.io/en/latest/api.html#streamlit.cache).
- 🆙 Improved the machinery behind `st.file_uploader`, so it's much more
  performant now! Also increased the default upload limit to 200MB
  (configurable via `server.max_upload_size`).
- 🔒 The `server.address` config option now _binds_ the server to that address
  for added security.
- 📄 Even more details added to error messages for `@st.cache` for easier
  debugging.

## Version 0.56.0

_Release date: February 15, 2020_

**Highlights:**

- 📄 Improved error messages for st.cache. The errors now also point to the new
  caching docs we just released. Read more
  [here](https://discuss.streamlit.io/t/help-us-stress-test-streamlit-s-latest-caching-update/1944)!

**Breaking changes:**

- 🐍 As [announced last month](https://discuss.streamlit.io/t/streamlit-will-deprecate-python-2-in-february/1656),
  **Streamlit no longer supports Python 2.** To use Streamlit you'll need
  Python 3.5 or above.

## Version 0.55.0

_Release date: February 4, 2020_

**Highlights:**

- 📺 **Ability to record screencasts directly from Streamlit!** This allows
  you to easily record and share explanations about your models, analyses,
  data, etc. Just click ☰ then "Record a screencast". Give it a try!

## Version 0.54.0

_Release date: January 29, 2020_

**Highlights:**

- ⌨️ Support for password fields! Just pass `type="password"` to
  `st.text_input()`.

**Notable fixes:**

- ✳️ Numerous st.cache improvements, including better support for complex objects.
- 🗣️ Fixed cross-talk in sidebar between multiple users.

**Breaking changes:**

- If you're using the SessionState <del>hack</del> Gist, you should re-download it!
  Depending on which hack you're using, here are some links to save you some
  time:
  - [SessionState.py](https://gist.github.com/tvst/036da038ab3e999a64497f42de966a92)
  - [st_state_patch.py](https://gist.github.com/tvst/0899a5cdc9f0467f7622750896e6bd7f)

## Version 0.53.0

_Release date: January 14, 2020_

**Highlights:**

- 🗺️ Support for all DeckGL features! Just use
  [Pydeck](https://deckgl.readthedocs.io/en/latest/) instead of
  [`st.deck_gl_chart`](https://docs.streamlit.io/en/latest/api.html#streamlit.pydeck_chart).
  To do that, simply pass a PyDeck object to
  [`st.pydeck_chart`](https://docs.streamlit.io/en/latest/api.html#streamlit.pydeck_chart),
  [`st.write`](https://docs.streamlit.io/en/latest/api.html#streamlit.write),
  or [magic](https://docs.streamlit.io/en/latest/api.html#magic).

  _Note that as a **preview release** things may change in the near future.
  Looking forward to hearing input from the community before we stabilize the
  API!_

  **The goals is for this to replace `st.deck_gl_chart`,** since it
  is does everything the old API did _and much more!_

- 🆕 Better handling of Streamlit upgrades while developing. We now auto-reload
  the browser tab if the app it is displaying uses a newer version of Streamlit
  than the one the tab is running.

- 👑 New favicon, with our new logo!

**Notable fixes:**

- Magic now works correctly in Python 3.8. It no longer causes
  docstrings to render in your app.

**Breaking changes:**

- Updated how we calculate the default width and height of all chart types.
  We now leave chart sizing up to your charting library itself, so please refer
  to the library's documentation.

  As a result, the `width` and `height` arguments have been deprecated
  from most chart commands, and `use_container_width` has been introduced
  everywhere to allow you to make charts fill as much horizontal space as
  possible (this used to be the default).