rustypyxl

A Rust-powered Excel (XLSX) library for Python with an openpyxl-compatible API.

It is also a standalone Rust crate: the same library is published on crates.io as rustypyxl for use directly from Rust, with no Python involved. See Using from Rust.

Installation

pip install rustypyxl

Using from Rust

The core is a normal Rust library -- the Python package is a thin binding over it.

[dependencies]
rustypyxl = "0.6"

use rustypyxl::{Workbook, CellValue};

let mut wb = Workbook::new();
wb.create_sheet(Some("Data".to_string())).unwrap();
wb.set_cell_value_in_sheet("Data", 1, 1, CellValue::from("Hello")).unwrap();
wb.save("output.xlsx").unwrap();

Usage

import rustypyxl

# Create or load a workbook
wb = rustypyxl.Workbook()
ws = wb.create_sheet('Sheet1')          # or: wb = rustypyxl.load_workbook('input.xlsx'); ws = wb.active

# openpyxl-style cell access
ws['A1'] = 'Hello'
ws['A2'] = 42.5
ws['A3'] = '=SUM(A1:A2)'
ws.cell(row=4, column=1).value = 'world'
print(ws['A1'].value)                   # -> "Hello"

# Append rows, merge, freeze, rename
ws.append(['Name', 'Age', 'Score'])
ws.merge_cells('A1:C1')
ws.freeze_panes = 'A2'
ws.title = 'Data'

# Iterate
for row in ws.iter_rows(values_only=True):
    print(row)

wb.save('output.xlsx')

Bulk API (fastest for large grids)

When writing or reading many rows at once, the workbook-level bulk methods avoid per-cell Python overhead:

wb.write_rows('Data', [
    ['Name', 'Age', 'Score'],
    ['Alice', 30, 95.5],
    ['Bob', 25, 87.3],
])
data = wb.read_rows('Data', min_row=1, max_row=100)

Features

openpyxl-compatible API: Familiar patterns (ws['A1'], ws.cell(), ws.append(), iter_rows()) for easy migration
Read and write support: Full round-trip capability
Cell values: Strings, numbers, booleans, dates, formulas
Formatting: Fonts (incl. underline styles), alignment, fills, borders, number formats
Workbook features: Hyperlinks, comments, named ranges, merged cells, freeze panes
Sheet protection: Cell locking and worksheet protection

Not yet supported through the Python API: inserting/deleting rows and columns, charts, and images.

Parquet import/export: Direct Parquet ↔ Excel conversion (bypasses Python FFI)
S3 support: Works with boto3 via bytes I/O
Bytes I/O: Load from bytes or file-like objects, save to bytes
Configurable compression: Trade off speed vs file size

Parquet Import

Import large Parquet files directly into Excel worksheets. Data flows from Parquet → Rust → Excel without crossing the Python FFI boundary, making it very fast for large datasets.

import rustypyxl

wb = rustypyxl.Workbook()
wb.create_sheet("Data")

# Import parquet file into sheet
result = wb.insert_from_parquet(
    sheet_name="Data",
    path="large_dataset.parquet",
    start_row=1,
    start_col=1,
    include_headers=True,
    column_renames={"old_name": "new_name"},  # optional
    columns=["col1", "col2", "col3"],  # optional: select specific columns
)

print(f"Imported {result['rows_imported']} rows")
print(f"Data range: {result['range']}")

wb.save("output.xlsx")

Performance: ~4 seconds for 1M rows × 20 columns on M1 MacBook Pro.

Parquet Export

Export worksheet data to Parquet format with automatic type inference:

import rustypyxl

wb = rustypyxl.load_workbook("data.xlsx")

# Export entire sheet
result = wb.export_to_parquet(
    sheet_name="Sheet1",
    path="output.parquet",
    has_headers=True,              # first row contains headers
    compression="snappy",          # snappy, zstd, gzip, lz4, none
    column_renames={"old": "new"}, # optional: rename columns
    column_types={"date_col": "datetime"},  # optional: force column types
)

print(f"Exported {result['rows_exported']} rows")
print(f"File size: {result['file_size']} bytes")

# Export specific range
result = wb.export_range_to_parquet(
    sheet_name="Sheet1",
    path="subset.parquet",
    min_row=1, min_col=1,
    max_row=1000, max_col=5,
)

Supported column type hints: string, float64, int64, boolean, date, datetime, auto.

Loading from Bytes or File-like Objects

Load workbooks from in-memory bytes or file-like objects:

import rustypyxl
import io

# From bytes
with open("file.xlsx", "rb") as f:
    data = f.read()
wb = rustypyxl.load_workbook(data)

# From file-like object (e.g., BytesIO, HTTP response)
wb = rustypyxl.load_workbook(io.BytesIO(data))

# Save to bytes (for HTTP responses, S3, etc.)
output_bytes = wb.save_to_bytes()

S3 Support

Use save_to_bytes() and load_workbook(bytes) with boto3 for S3 integration:

import boto3
import rustypyxl

s3 = boto3.client("s3")

# Load from S3
response = s3.get_object(Bucket="my-bucket", Key="path/to/file.xlsx")
wb = rustypyxl.load_workbook(response["Body"].read())

# Save to S3
data = wb.save_to_bytes()
s3.put_object(Bucket="my-bucket", Key="path/to/output.xlsx", Body=data)

This works with any S3-compatible service and uses boto3's credential handling (IAM roles, environment variables, etc.).

Streaming Writes (Low Memory)

For very large files, use WriteOnlyWorkbook which streams rows directly to disk:

import rustypyxl

wb = rustypyxl.WriteOnlyWorkbook("large_output.xlsx")
wb.create_sheet("Data")

for i in range(1_000_000):
    wb.append_row([f"Row {i}", i, i * 1.5, i % 2 == 0])

wb.close()  # Must call close() to finalize the file

This uses minimal memory regardless of file size, similar to openpyxl's write_only=True mode.

Benchmarks

Apple Silicon, openpyxl 3.1.5. Times are the minimum wall-clock over several runs (the fastest run is the one least disturbed by other processes), measured on an otherwise-idle machine. Your results will vary with data and hardware.

Write Performance (1M rows × 20 columns, mixed data)

Method	Time	vs openpyxl
rustypyxl `WriteOnlyWorkbook` (streaming)	~4s	~27x
rustypyxl `write_rows` (build in memory, then save)	~29s	~4x
openpyxl (`write_only`)	~112s	—

The streaming path is the one to use for large writes: it serializes rows straight to disk and never holds the sheet in memory. write_rows is slower at this scale because all 20M cell values cross the Python/Rust boundary and the whole workbook is built in memory first; it is convenient for moderate sheets, not the throughput path. (Loading straight from Parquet with insert_from_parquet avoids the boundary entirely -- see the Parquet section.)

Read Performance (min wall time)

Dataset	rustypyxl	calamine	openpyxl
10k × 20 (numeric)	0.09s	0.10s	0.73s
10k × 20 (strings)	0.11s	0.11s	1.55s
100k × 20 (numeric)	1.02s	1.01s	7.16s
100k × 20 (mixed)	1.25s	1.16s	11.9s

rustypyxl and calamine (a read-only Rust reader, via python-calamine) are within noise of each other, both roughly 5-10x faster than openpyxl's read-only mode.

Memory Usage (Read)

Dataset	rustypyxl	calamine	openpyxl
10k × 20	29 MB	9 MB	11 MB
50k × 20	62 MB	48 MB	53 MB
100k × 20	103 MB	95 MB	106 MB

rustypyxl keeps the whole workbook resident (like openpyxl's default mode), so its read footprint is comparable to openpyxl and above calamine's streaming reader. For low-memory reads of very large files, the trade-off is CPU vs RAM.

Memory Usage (Write)

Dataset	rustypyxl (`write_rows`)	`WriteOnlyWorkbook`	openpyxl (`write_only`)
10k × 20	10 MB	~0 MB	0.4 MB
50k × 20	50 MB	~0 MB	0.4 MB
100k × 20	99 MB	~0 MB	0.4 MB

WriteOnlyWorkbook streams rows directly to disk, so its memory stays flat regardless of file size -- the same idea as openpyxl's write_only mode.

Building from Source

# Install Rust and maturin
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
pip install maturin

# Build
maturin develop --release

License

MIT

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- Owner: https://github.com/freeeve
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: publish.yml@249e8cde1c7beedf1b8c9845a905b9cfbe52b0a7
- Trigger Event: release

Release history Release notifications | RSS feed

0.7.1

Jul 16, 2026 7 files

This release

0.7.0 This release

Jul 16, 2026 7 files

0.6.0

Jul 15, 2026 7 files

0.5.0

Jun 10, 2026 16 files

0.4.0

Jun 9, 2026 16 files

0.3.1

Feb 6, 2026 15 files

0.3.0

Jan 31, 2026 15 files

0.1.1

Jan 29, 2026 15 files

0.1.0

Jan 29, 2026 16 files

rustypyxl 0.7.0

rustypyxl

Installation

Using from Rust

Usage

Bulk API (fastest for large grids)

Features

Parquet Import

Parquet Export

Loading from Bytes or File-like Objects

S3 Support

Streaming Writes (Low Memory)

Benchmarks

Write Performance (1M rows × 20 columns, mixed data)

Read Performance (min wall time)

Memory Usage (Read)

Memory Usage (Write)

Building from Source

License

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1 maintainer

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Release history Release notifications | RSS feed