Module changelog 

Changes and fixes in the polars_excel_writer library.

Changelog

This is the changelog/release notes for the polars_excel_writer crate.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[0.21.0] - 2025-09-27

Added

• Added polars_comparison documentation section comparing the key similarities and differences between PolarsExcelWriter and the Polars write_excel() function.

• Added enable_column_urls() option to convert a string column as a list of URLs and export as Excel hyperlinks.

  

• Added enable_column_formulas() option to convert a string column as a list of Excel functions.

  

[0.20.0] - 2025-09-17

Added

• Update dependencies to rust_xlsxwriter 0.90.1 and polars 0.51.

[0.19.0] - 2025-08-28

Added

• Added the save_to_buffer() method to allow writing a dataframe as an Excel file to a byte vector buffer.

• Added the save_to_writer() method to allow writing a dataframe as an Excel file to a type that implements the Write trait.

[0.18.0] - 2025-08-13

Added

• Update dependencies to rust_xlsxwriter 0.90 and polars 0.50.

[0.17.0] - 2025-07-27

Added

• Reduced Polars dependencies for smaller/faster builds.

  Issue #27.

[0.16.0] - 2025-06-29

Added

• Update dependencies to rust_xlsxwriter 0.89 and polars 0.49.

[0.15.1] - 2025-06-28

Fixed

• Fixed zlib feature dependency. Due to changes in polars and/or zip the C version of zlib wasn’t being included when the zlib feature flag was added.

[0.15.0] - 2025-06-15

Added

• Update dependencies to rust_xlsxwriter 0.88 and polars 0.48.

• This version emphasizes the PolarsExcelWriterinterface and compatibility with the Polars write_excel interface. See the polars_excel_writer Roadmap.

Deprecated

• This version of crate drops support for the Polars SerWriter interface in order to maximize compatibility with the Polars write_excel interface. The SerWriter interface will eventually move to another crate.

• Rename PolarsXlsxWriter struct to PolarsExcelWriter.

  This rename is for consistency with Polars. The deprecated PolarsXlsxWriter struct name is still supported via a type alias.

[0.14.0] - 2025-05-03

Added

• Added support for setting dataframe formatting based on data types or columns. It also adds header formatting. See:

  • set_dtype_format()
  • set_column_format()
  • set_header_format()

Deprecated

• The following functions are deprecated in favour of PolarsExcelWriter::set_dtype_format() and variants:

  • PolarsExcelWriter::set_float_format()
  • PolarsExcelWriter::set_time_format()
  • PolarsExcelWriter::set_date_format()
  • PolarsExcelWriter::set_datetime_format()

[0.13.0] - 2025-03-15

Added

• Update dependencies to rust_xlsxwriter 0.84.

[0.12.0] - 2025-01-29

Added

• Update dependencies to rust_xlsxwriter 0.82.0 and polars 0.46.

• Added support for overriding the default handling of NaN and Infinity numbers. These aren’t supported by Excel so they are replaced with default or custom string values. See:

  • set_nan_value()
  • set_infinity_value()
  • set_neg_infinity_value()

[0.11.0] - 2025-01-18

Added

• Update dependencies to rust_xlsxwriter 0.81.0 and polars 0.45.

[0.10.0] - 2025-01-05

Added

• Update dependencies to rust_xlsxwriter 0.80.0 and polars 0.44.

• Changed documentation to highlight write_xlsx as the primary interface, since that will be the main interface in future releases.

[0.9.0] - 2024-09-18

Added

• Update dependencies to rust_xlsxwriter 0.77.0 and polars 0.43.

[0.8.0] - 2024-08-24

Added

• Update dependencies to rust_xlsxwriter 0.74.0 and polars 0.42.0.

[0.7.0] - 2024-03-25

Added

• Update dependencies to rust_xlsxwriter 0.63.0 and polars 0.37.0.

[0.6.0] - 2024-01-24

Added

• Update dependencies to rust_xlsxwriter 0.62.0 and polars 0.36.2.

[0.5.0] - 2024-01-15

Added

• Added support for writing u64 and i64 number within Excel’s limitations. This implies a loss of precision outside Excel’s integer range of +/- 999,999,999,999,999 (15 digits).

[0.4.0] - 2023-11-22

Added

• Update to the latest rust_xlsxwriter to fix issues with PolarsError type/location.

[0.3.0] - 2023-09-05

Added

More worksheet utility methods.

• Added support for renaming worksheets via the set_worksheet_name() method.

• Added support for adding worksheets via the add_worksheet() method. This allows you to add dataframes to several different worksheets in a workbook.

• Added support for accessing the current worksheets via the worksheet() method.

[0.2.0] - 2023-09-04

Added

• Added support for setting worksheet table properties via the PolarsExcelWriter set_table() method.

[0.1.0] - 2023-08-20

Added

• First functional version.