polars_excel_writer 0.21.0

A Polars extension to serialize dataframes to Excel xlsx files
Documentation 
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// SPDX-License-Identifier: MIT OR Apache-2.0
//
// Copyright 2022-2025, John McNamara, jmcnamara@cpan.org

//! An example of writing a Polar Rust dataframe to an Excel file. This
//! demonstrates setting formats for different columns.

use polars::prelude::*;

use polars_excel_writer::PolarsExcelWriter;

fn main() -> PolarsResult<()> {
    // Create a sample dataframe for the example.
    let df: DataFrame = df!(
        "East" => &[1.0, 2.22, 3.333, 4.4444],
        "West" => &[1.0, 2.22, 3.333, 4.4444],
    )?;

    // Create a new excel writer.
    let mut excel_writer = PolarsExcelWriter::new();

    // Set the number formats for the columns.
    excel_writer.set_column_format("East", "0.00");
    excel_writer.set_column_format("West", "0.0000");

    // Write the dataframe to Excel.
    excel_writer.write_dataframe(&df)?;

    // Save the file to disk.
    excel_writer.save("dataframe.xlsx")?;

    Ok(())
}