aerofs 4.0.2

High-Performance Asynchronous File I/O for Python, powered by Rust

aerofs: High-Performance Asynchronous File I/O for Python

aerofs is an Apache 2.0 licensed library for handling local disk files in asyncio applications, written in Rust and powered by PyO3 and Tokio for maximum performance.

Ordinary local file I/O is blocking and cannot easily be made asynchronous. This means doing file I/O may interfere with asyncio applications, which shouldn't block the executing thread. aerofs solves this by providing asynchronous file operations with superior performance compared to pure Python alternatives like aiofiles.

import aerofs

async with aerofs.open('filename', mode='r') as f:
    contents = await f.read()
print(contents)

Asynchronous iteration is also supported:

async with aerofs.open('filename') as f:
    async for line in f:
        print(line)

Asynchronous interface to tempfile module:

async with aerofs.tempfile.TemporaryFile('wb') as f:
    await f.write(b'Hello, World!')

Installation

To install aerofs, simply:

uv pip install aerofs

Note: Official wheels available for Linux and macOS (Intel & Apple Silicon / universal2). Windows not yet supported.

Usage

Basic File Operations

Files are opened using the aerofs.open() coroutine, which mirrors Python's builtin open():

import aerofs

async def read_file():
    async with aerofs.open('example.txt', 'r') as f:
        content = await f.read()
        return content

async def write_file():
    async with aerofs.open('example.txt', 'w') as f:
        await f.write('Hello, World!')

The following methods are async and available on file objects:

• close
• flush
• isatty
• read
• readall
• read1
• readinto
• readline
• readlines
• seek
• seekable
• tell
• truncate
• writable
• write
• writelines

Standard I/O

Async access to standard streams:

import aerofs

async def read_stdin():
    async for line in aerofs.stdin:
        print(f"You typed: {line}")

async def write_stdout():
    await aerofs.stdout.write("Hello from async stdout!\n")
    await aerofs.stdout.flush()

Available streams:

• aerofs.stdin, aerofs.stdout, aerofs.stderr
• aerofs.stdin_bytes, aerofs.stdout_bytes, aerofs.stderr_bytes

OS Operations

The aerofs.os module contains async versions of useful os functions:

import aerofs.os

async def os_operations():
    # Check if file exists
    exists = await aerofs.os.path.exists('myfile.txt')
    
    # List directory
    files = await aerofs.os.listdir('.')
    
    # Get file stats
    stats = await aerofs.os.stat('myfile.txt')
    
    # File operations
    await aerofs.os.rename('old.txt', 'new.txt')
    await aerofs.os.remove('unwanted.txt')
    await aerofs.os.mkdir('newdir')

Available operations:

• stat, statvfs, sendfile
• rename, renames, replace, remove, unlink
• mkdir, makedirs, rmdir, removedirs
• link, symlink, readlink
• listdir, scandir, access, getcwd
• path.abspath, path.exists, path.isfile, path.isdir
• path.islink, path.ismount, path.getsize
• path.getatime, path.getctime, path.samefile, path.sameopenfile

Tempfile

aerofs.tempfile implements async interfaces for temporary files:

import aerofs.tempfile
import os

async def use_tempfile():
    # Named temporary file
    async with aerofs.tempfile.NamedTemporaryFile('wb+') as f:
        await f.write(b'Line1\nLine2')
        await f.seek(0)
        async for line in f:
            print(line)
    
    # Temporary directory
    async with aerofs.tempfile.TemporaryDirectory() as d:
        filename = os.path.join(d, "file.ext")
        async with aerofs.open(filename, 'w') as f:
            await f.write("temporary data")

Available interfaces:

• TemporaryFile
• NamedTemporaryFile
• SpooledTemporaryFile
• TemporaryDirectory

Requirements

• Python 3.9 or higher
• Linux or macOS (Intel/Apple Silicon). Windows not yet supported.

Contributing

Contributions are very welcome! Please feel free to submit a Pull Request.

Development Setup

1. Clone the repository:

git clone https://github.com/ohmyarthur/aerofs.git
cd aerofs

2. Install development dependencies:

uv pip install -e ".[dev]"

3. Run tests:

pytest

Building from Source

# Install maturin
uv pip install maturin

# Build the package
maturin develop

# Or build a wheel
maturin build --release

License

This project is licensed under the Apache License 2.0 - see the LICENSE file for details.

Acknowledgments

Inspired by aiofiles, but built from the ground up with Rust .