scah for Python
CSS selectors meet streaming HTML parsing. Extract exactly what you select, without building a DOM.
Python bindings for scah, a Rust HTML extraction library. scah matches CSS selectors in a single forward pass over the document and stores only the matches.
pip install scah
Usage
from scah import Query, Save, parse
html = """
<main>
<section><a href="/one">One</a><div><a href="/two">Two</a></div></section>
</main>
"""
query = (
Query.all("main > section", Save.none())
.then(lambda section: [
section.all("> a[href]", Save.only_text()),
section.all("div a", Save.only_text()),
])
.build()
)
store = parse(html, [query])
for section in store.get("main > section"):
for link in section.get("> a[href]"):
print(link.text, link.get_attribute("href")) # One /one
Save controls what is captured for each match: Save.all(),
Save.only_inner_html(), Save.only_raw_text(), Save.only_text(), or
Save.none() (attributes only). Each element exposes name, id,
class_name, attributes, inner_html, raw_text, text, and
get(selector) for nested query results.
See the main README for supported selectors and text-extraction semantics.
Benchmarks
| Library | WHATWG spec | Nested (all) | Flat (all) | Flat (first) |
|---|---|---|---|---|
| Scah | 116 ms | 25.2 ms | 8.61 ms | 47.0 µs |
| Selectolax | 340 ms (2.94×) | 162 ms (6.43×) | 21.2 ms (2.46×) | 9.23 ms (196×) |
| lxml | 769 ms (6.65×) | 970 ms (38.4×) | 53.0 ms (6.16×) | 15.9 ms (337×) |
| Parsel | 1.80 s (15.5×) | 767 ms (30.4×) | 200 ms (23.2×) | 25.8 ms (550×) |
| Gazpacho | 3.81 s (33.0×) | — | 556 ms (64.6×) | 156 ms (3,325×) |
| BS4 (lxml) | 5.45 s (47.1×) | 2.15 s (85.3×) | 248 ms (28.8×) | 246 ms (5,235×) |
Mean time per parse and query; lower is better. Multipliers are relative to scah. Synthetic inputs use 10,000 elements. Measured 2026-04-08 to 2026-07-15; raw data and run details in benches/results/python.
License
1 maintainer
Metadata
1 maintainer
Release files for scah 0.1.0
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Built distributions (wheels)
| File | Reset | |||
|---|---|---|---|---|
| scah-0.1.0-cp310-abi3-win_amd64.whl | CPython 3.10 | abi3 | Windows x86-64 | Details |
| scah-0.1.0-cp310-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl | CPython 3.10 | abi3 | Linux glibc 2.17+ x86-64 | Details |
| scah-0.1.0-cp310-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl | CPython 3.10 | abi3 | Linux glibc 2.17+ ARM64 | Details |
| scah-0.1.0-cp310-abi3-macosx_11_0_arm64.whl | CPython 3.10 | abi3 | macOS 11.0+ ARM64 | Details |
| scah-0.1.0-cp310-abi3-macosx_10_12_x86_64.whl | CPython 3.10 | abi3 | macOS 10.12+ x86-64 | Details |
Total release size: 2.1 MB
Release files / scah-0.1.0-cp310-abi3-win_amd64.whl
| Download URL | scah-0.1.0-cp310-abi3-win_amd64.whl |
|---|---|
| Size | 410.0 kB |
| Tags | CPython 3.10 Windows x86-64 abi3 |
|
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| Tags | CPython 3.10 Linux glibc 2.17+ x86-64 abi3 |
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| Tags | CPython 3.10 abi3 macOS 10.12+ x86-64 |
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