liac-arff

library2.5.0pypypi✓ verified 84d ago

liac-arff is a Python library for reading and writing ARFF (Attribute-Relation File Format) files, commonly used in WEKA machine learning toolkits. Current version 2.5.0 is the last to support Python 2. It supports sparse ARFF, data generators, and standard Java escape sequences. Release cadence is irregular, with about 1-2 releases per year.

ai-ml data serialization

pip install liac-arff

github ↗package ↗

INSTALL

IMPORT

SIG · LIAC-ARFF

liac-arff

ai-mlpythonv2.5.0

Install

2.4s avg

Import

20ms

Disk

17MB

Pass rate

10/ 10

Env Coverage10 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v2.5.0 · pip install

no network on importno background threads

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

py 3.10–3.95 runs

installs and imports cleanly · install 0.0s · import 0.022s · 19.2MB

glibc

py 3.10–3.95 runs

installs and imports cleanly · install 2.4s · import 0.018s · 20MB

17MB installed

● package 17MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

arff

✓ import arff

load

✓ data = arff.load(open('file.arff'))

✗ from arff import load

load is a function in the arff module, not a top-level import. Import the module first.

Load an ARFF file and access its attributes and data.

import arff # Load ARFF file with open('example.arff') as f: data = arff.load(f) print(data['attributes']) print(data['data']) # Load with generator (lazy loading) with open('example.arff') as f: for row in arff.load(f, return_type='generator'): print(row)

Debug

Known issues

gotchaThe `load()` function expects a file-like object, not a file path. Use `open()` or `io.StringIO`.

fix

Use `with open('file.arff') as f: data = arff.load(f)`

affects: all

gotchaWhen using `return_type='generator'`, the returned object is a generator that yields rows incrementally, but the `attributes` key is only available after the first iteration or after exhausting the generator. Accessing `data['attributes']` before iterating may raise an error or return an empty list.

fix

Iterate over the generator first or use `list(data['data'])` to consume it, then access `data['attributes']`.

affects: >=2.4.0

breakingPython 2.7 support removed in version 2.5.0. Users on Python 2 must stay on version 2.4.0 or earlier.

fix

Upgrade to Python 3.5+ or pin liac-arff to <=2.4.0.

affects: >=2.5.0

Errors

Common errors & fixes

AttributeError: module 'arff' has no attribute 'load'

Attempting to import 'load' directly from arff (e.g., `from arff import load`) but the correct usage is to import the module and call arff.load.

fix

Use `import arff` then `data = arff.load(...)`

TypeError: expected str, bytes or os.PathLike object, not _io.BufferedReader

Passing an open file handle where a path string is expected (often from mixing with other libraries).

fix

Ensure you pass the file object to `arff.load()`, not the path. If a path is needed, open it first: `with open(path) as f: arff.load(f)`

Upgrade

Version history

2.5.0latest on PyPI · released Aug 31, 2020

Audit

Dependencies

No dependency data recorded yet.

Agent activity

14 hits · last 30 days

node

Resources

githubhttps://github.com/renatopp/liac-arff ↗

packagehttps://pypi.org/project/liac-arff/ ↗