fastyaml-rs
A fast YAML 1.2.2 parser and linter for Python, powered by Rust.
[!IMPORTANT] Requires Python 3.10 or later.
Installation
pip install fastyaml-rs
Usage
import fast_yaml
# Parse YAML
data = fast_yaml.safe_load("name: test\nvalue: 123")
print(data) # {'name': 'test', 'value': 123}
# Dump YAML
yaml_str = fast_yaml.safe_dump({"name": "test", "value": 123})
print(yaml_str) # name: test\nvalue: 123\n
Features
- YAML 1.2.2 compliant — Full Core Schema support
- Fast — 5-10x faster than PyYAML
- PyYAML compatible — Drop-in replacement with
load,dump,Loader,Dumperclasses - Linter — Rich diagnostics with line/column tracking
- Parallel processing — Multi-threaded parsing for large files
- Batch processing — Process multiple files in parallel
- Type stubs — Full IDE support with
.pyifiles
Batch Processing
Process multiple YAML files in parallel:
from fast_yaml._core import batch
# Parse multiple files
result = batch.process_files(
[
"config1.yaml",
"config2.yaml",
"config3.yaml",
]
)
print(f"Processed {result.total} files, {result.failed} failed")
# With configuration
config = batch.BatchConfig(workers=4, indent=2)
result = batch.process_files(paths, config)
Format Files
# Dry-run: get formatted content without writing
results = batch.format_files(["config.yaml"])
for path, content, error in results:
if content:
print(f"{path}: {len(content)} bytes")
# In-place: format and write back
result = batch.format_files_in_place(["config.yaml"])
print(f"Changed {result.changed} files")
BatchConfig Options
| Option | Default | Description |
|---|---|---|
workers |
Auto | Number of worker threads |
mmap_threshold |
512 KB | Mmap threshold for large files |
max_input_size |
100 MB | Maximum file size |
indent |
2 | Indentation width |
width |
80 | Line width |
sort_keys |
False | Sort dictionary keys |
BatchResult
result = batch.process_files(paths)
print(f"Total: {result.total}")
print(f"Success: {result.success}")
print(f"Changed: {result.changed}")
print(f"Failed: {result.failed}")
print(f"Duration: {result.duration_ms}ms")
print(f"Files/sec: {result.files_per_second()}")
for path, error in result.errors():
print(f"Error in {path}: {error}")
Documentation
See the main repository for full documentation.
License
Licensed under either of Apache License, Version 2.0 or MIT License at your option.
Metadata
Release files for fastyaml-rs 0.6.6
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| fastyaml_rs-0.6.6.tar.gz | 278.9 kB | Details |
Built distributions (wheels)
Total release size: 27.7 MB
Release files / fastyaml_rs-0.6.6.tar.gz
| Download URL | fastyaml_rs-0.6.6.tar.gz |
|---|---|
| Size | 278.9 kB |
| Tags | Source |
|
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