What's Changed

Breaking Changes 🛠

• Remove pydantic fix in bootstrap by @lukasmasuch in https://github.com/streamlit/streamlit/pull/9257
• Remove experimental cached widget replay logic by @lukasmasuch in https://github.com/streamlit/streamlit/pull/9305

New Features 🎉

• [RFC] Only rerun script on reconnect if a script run was interrupted by @vdonato in https://github.com/streamlit/streamlit/pull/9083
• Add syntax highlighting for diff by @raethlein in https://github.com/streamlit/streamlit/pull/9172
• Support to_pandas method to return a Pandas Series by @lukasmasuch in https://github.com/streamlit/streamlit/pull/9175
• Add support for Kubernetes / directory with mounted file style secrets by @sfc-gh-mochen in https://github.com/streamlit/streamlit/pull/9078
• Extend dataframe-handling support for collection-like types by @lukasmasuch in https://github.com/streamlit/streamlit/pull/9205
• Add support for Snowpark Pandas Index by @lukasmasuch in https://github.com/streamlit/streamlit/pull/9222
• Add data handling support for Polars by @lukasmasuch in https://github.com/streamlit/streamlit/pull/9230
• Add data handling support for xarray by @lukasmasuch in https://github.com/streamlit/streamlit/pull/9235
• Add data handling support for Dask by @lukasmasuch in https://github.com/streamlit/streamlit/pull/9240
• Add data handling support for Ray by @lukasmasuch in https://github.com/streamlit/streamlit/pull/9256
• Type-hint improvements for #8717 and #7801 by @Asaurus1 in https://github.com/streamlit/streamlit/pull/9048
• Allow configurable expansion depth for st.json by @lukasmasuch in https://github.com/streamlit/streamlit/pull/8984
• Add data handling support for DB API 2.0 by @lukasmasuch in https://github.com/streamlit/streamlit/pull/9274
• Add data handling support for Pydantic instances by @lukasmasuch in https://github.com/streamlit/streamlit/pull/9290
• Add support for dataframe interchange protocol by @lukasmasuch in https://github.com/streamlit/streamlit/pull/9289
• Add line wrapping to st code by @sfc-gh-tteixeira in https://github.com/streamlit/streamlit/pull/8558

Bug Fixes 🐛

• Make the magic support for-else, while-else, try-else, try-except*, and match by @whitphx in https://github.com/streamlit/streamlit/pull/9110
• Fix copy-buttons in dialogs by @raethlein in https://github.com/streamlit/streamlit/pull/9130
• Support theming in embed better by @kmcgrady in https://github.com/streamlit/streamlit/pull/9103
• Fix #8638 by @kajarenc in https://github.com/streamlit/streamlit/pull/9101
• Bugfix: Multiple Stale Maps by @sfc-gh-nbellante in https://github.com/streamlit/streamlit/pull/9092
• Bugfix: Upgrade plotly.js to resolve hover tooltip bug by @sfc-gh-nbellante in https://github.com/streamlit/streamlit/pull/9144
• Make ScriptControlException inherit from BaseException again by @raethlein in https://github.com/streamlit/streamlit/pull/9167
• Print deprecation warnings when dialog/fragment functions are called by @vdonato in https://github.com/streamlit/streamlit/pull/9170
• Revert "Remove fragment_ids_this_run from script run context (#8953)" and tweaks some types by @vdonato in https://github.com/streamlit/streamlit/pull/9178
• Allow adding Plotly toolbar buttons by @lukasmasuch in https://github.com/streamlit/streamlit/pull/9190
• Ignore all headings in markdown labels by @lukasmasuch in https://github.com/streamlit/streamlit/pull/9189
• Don't raise FragmentStorageKeyError for auto_rerun fragments by @raethlein in https://github.com/streamlit/streamlit/pull/9183
• Fix ghost tabs issue in fragments by @raethlein in https://github.com/streamlit/streamlit/pull/9186
• Fix empty anchor scrolling by @lukasmasuch in https://github.com/streamlit/streamlit/pull/9206
• Only clear up fragment-related stale widgets by @raethlein in https://github.com/streamlit/streamlit/pull/9215
• Fix issue with empty Azure OpenAI chunk by @lukasmasuch in https://github.com/streamlit/streamlit/pull/9234
• Fix grey-out for selectbox index columns by @lukasmasuch in https://github.com/streamlit/streamlit/pull/9231
• Fix options support for dict.items() by @lukasmasuch in https://github.com/streamlit/streamlit/pull/9241
• When clearing forward queue add a stopped for rerun message by @dannyopts in https://github.com/streamlit/streamlit/pull/9187
• Do not preserve children of a block if the block type changes by @kmcgrady in https://github.com/streamlit/streamlit/pull/9276
• Unstale just updated fragments by @raethlein in https://github.com/streamlit/streamlit/pull/9285
• Fix logo + sidebar sizing interaction by @mayagbarnes in https://github.com/streamlit/streamlit/pull/9298

Other Changes

• Print bottom container always at the end of the app content by @raethlein in https://github.com/streamlit/streamlit/pull/9129
• Remove a type ignore by @wyattscarpenter in https://github.com/streamlit/streamlit/pull/9149
• Use material icons in streamlit hello page nav and favicons by @snehankekre in https://github.com/streamlit/streamlit/pull/9225
• Fix nested fragment stale elements by @raethlein in https://github.com/streamlit/streamlit/pull/9246
• Use overloads to make the return types of st.feedback more precise. (with type tests) by @wyattscarpenter in https://github.com/streamlit/streamlit/pull/9216

New Contributors

• @wyattscarpenter made their first contribution in https://github.com/streamlit/streamlit/pull/9149
• @sfc-gh-mochen made their first contribution in https://github.com/streamlit/streamlit/pull/9078
• @dannyopts made their first contribution in https://github.com/streamlit/streamlit/pull/9187

Full Changelog: https://github.com/streamlit/streamlit/compare/1.37.1...1.38.0