quarb
Python bindings for the Quarb query engine — import quarb, plus qua, its command-line face. Quarb reads
structured text as an arbor — a tree-spanned graph — and runs
one query language over all of it, generalizing what XPath does
for XML and jq does for JSON to JSON, YAML, TOML, CSV/TSV, XML,
HTML, and Markdown alike. Try it live in the
playground.
Install
pip install quarb
This installs the quarb Python module and the qua command
(the language is Quarb; qua is its CLI).
Wheels are published for Linux (x86_64, aarch64), macOS (arm64,
x86_64), and Windows (x86_64). The extension is built against
PyO3's stable ABI (abi3-py38); a single wheel covers CPython
3.8 and later.
The qua command
The entry point covers what the bindings cover — one query over a text document:
qua '/books/*[/price:: > 20]/title::' store.json
echo '{"users":[{"name":"ada"}]}' | qua -f json '/users/*/name::'
Beyond text, quarb.open(path) dispatches on kind over the full
local fleet — SQLite, kaiv (typed units), the filesystem
(descend=True grafts parseable leaves), git (git:PATH),
archives, XLSX, and source code — and quarb.mount([a, b, ...])
mounts several sources under one root so a single query joins
across them (a YAML file <=> a SQLite database). The networked
adapters — Postgres, MySQL, BigQuery, Neo4j, object stores,
mail — and DuckDB live in the Rust binary: cargo install qua.
Quick start
import quarb
doc = quarb.loads("""{
"books": [
{"title": "The Odyssey", "price": 25},
{"title": "The Iliad", "price": 18}
]
}""", "json")
doc.values('/books/*[/price:: > 20]/title::')
# ['The Odyssey']
doc.value('/books/*/price:: @| mean')
# 21.5
doc.records('/books/* | %(t = /title::; p = /price::)')
# [{'t': 'The Odyssey', 'p': 25}, {'t': 'The Iliad', 'p': 18}]
doc.plan('/books/*') # the static plan, as kaiv
doc.values('/books/*/title::', budget='nodes=1')
# ValueError: refused: the plan estimates 2 nodes; the budget allows 1
loads(text, format) / load(path) parse once into a
Document, queried many times. Results come back typed:
ints, floats, strings, None for null, tz-aware datetime for
instants, timedelta for durations, Quantity for unit-carrying
values, dicts for records. Formats: json, yaml, toml,
csv, tsv, xml, html, markdown.
The lower-level quarb.run(query, text, format) and
quarb.run_file(query, path) return the result lines as
strings — exactly what the qua CLI prints. All errors raise
ValueError with the engine's message.
For the query language itself — steps, criteria, readings, patterns, joins — see the user guide and spec.
License
Licensed under either of Apache License, Version 2.0 or the MIT license at your option. Both texts are bundled in the package.
Jupyter
%load_ext quarb.ipython
%quarb_mount fleet.daiv
%quarb /@hosts/*[::power > 0.2kW]::name
%%quarb [NAME] runs a cell-sized query against a named mount;
results render as HTML tables, iterate as typed values
(quantities keep magnitude + unit), and convert with .df /
.df_magnitudes(). A query closing in a drawing renders rich
too: @| tree as a folding outline (every node with children
opens and closes, with expand all / collapse all on top),
@| histogram as a bar grid — the text the terminal prints
stays the plain form (Document.values_html answers both,
quarb.closes_with_drawing says when a query has a drawing).
For a notebook where every cell is a query, install the dedicated kernel and pick Quarb in the launcher:
python -m quarb.kernel install
python -m quarb.kernel demo # writes quarb-demo.ipynb to try
Cells are queries; %mount, %connect, %use, %docs,
%translate, and %python (an escape hatch — the rest of the
cell is Python, with the live session and the last result _
in scope) are the directives. Tab-completion offers the mounted arbor's real child names,
and the bundled JupyterLab extension highlights Quarb syntax
in cells automatically. %connect NAME PATH... (magic:
%quarb_connect) attaches to a qua --resident daemon — for
arbors too large to rebuild per notebook, queried from a
standing session. pip install quarb[jupyter] pulls IPython,
pandas, and the kernel runtime.
1 maintainer
Metadata
1 maintainer
Release files for quarb 0.42.0
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Source distribution (sdist)
| File | Size | Uploaded | Provenance | |
|---|---|---|---|---|
| quarb-0.42.0.tar.gz | 2.2 MB | With provenance | Details |
Built distributions (wheels)
| File | Reset | |||
|---|---|---|---|---|
| quarb-0.42.0-cp38-abi3-win_amd64.whl | CPython 3.8 | abi3 | Windows x86-64 | Details |
| quarb-0.42.0-cp38-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl | CPython 3.8 | abi3 | Linux glibc 2.17+ x86-64 | Details |
| quarb-0.42.0-cp38-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl | CPython 3.8 | abi3 | Linux glibc 2.17+ ARM64 | Details |
| quarb-0.42.0-cp38-abi3-macosx_11_0_arm64.whl | CPython 3.8 | abi3 | macOS 11.0+ ARM64 | Details |
| quarb-0.42.0-cp38-abi3-macosx_10_12_x86_64.whl | CPython 3.8 | abi3 | macOS 10.12+ x86-64 | Details |
Total release size: 89.9 MB
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