// 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 an Excel number format for floats.
use polars::prelude::*;
use polars_excel_writer::PolarsExcelWriter;
fn main() -> PolarsResult<()> {
// Create a sample dataframe for the example.
let df: DataFrame = df!(
"Float" => &[1000.0, 2000.22, 3000.333, 4000.4444],
)?;
// Create a new excel writer.
let mut excel_writer = PolarsExcelWriter::new();
// Set the float format.
excel_writer.set_dtype_float_format("#,##0.00");
// Write the dataframe to Excel.
excel_writer.write_dataframe(&df)?;
// Save the file to disk.
excel_writer.save("dataframe.xlsx")?;
Ok(())
}