The liac-arff module implements functions to read and write ARFF files in Python.
Attribute Relationship File Format (ARFF) is the text format file used by Weka to store data in a database. This module is an ARFF file handler based on other python parser modules (such json and yaml).
NOTE: You can clone the arff-datasets repository for a large set of ARFF files.
- Read and Write ARFF files using python built-in structures;
- Supports NUMERIC, REAL, INTEGER, STRING and NOMINAL attribute types;
- Supports names with space;
- Read and Write the description of the file;
- MIT license;
Via easy_install:
$ easy_install liac-arffManually:
$ python setup.py installYou can read an ARFF file as follows:
>>> import arff
>>> data = arff.load(open('wheater.arff', 'rb'))Which results in:
>>> data
{
'attributes': [
('outlook', ['sunny', 'overcast', 'rainy']),
('temperature', 'REAL'),
('humidity', 'REAL'),
('windy', ['TRUE', 'FALSE']),
('play', ['yes', 'no'])],
'data': [
['sunny', 85.0, 85.0, 'FALSE', 'no'],
['sunny', 80.0, 90.0, 'TRUE', 'no'],
['overcast', 83.0, 86.0, 'FALSE', 'yes'],
['rainy', 70.0, 96.0, 'FALSE', 'yes'],
['rainy', 68.0, 80.0, 'FALSE', 'yes'],
['rainy', 65.0, 70.0, 'TRUE', 'no'],
['overcast', 64.0, 65.0, 'TRUE', 'yes'],
['sunny', 72.0, 95.0, 'FALSE', 'no'],
['sunny', 69.0, 70.0, 'FALSE', 'yes'],
['rainy', 75.0, 80.0, 'FALSE', 'yes'],
['sunny', 75.0, 70.0, 'TRUE', 'yes'],
['overcast', 72.0, 90.0, 'TRUE', 'yes'],
['overcast', 81.0, 75.0, 'FALSE', 'yes'],
['rainy', 71.0, 91.0, 'TRUE', 'no']],
'description': u'',
'relation': 'weather'
}You can write an ARFF file with this structure:
>>> print arff.dumps(data)
@RELATION weather
@ATTRIBUTE outlook {sunny, overcast, rainy}
@ATTRIBUTE temperature REAL
@ATTRIBUTE humidity REAL
@ATTRIBUTE windy {TRUE, FALSE}
@ATTRIBUTE play {yes, no}
@DATA
sunny,85.0,85.0,FALSE,no
sunny,80.0,90.0,TRUE,no
overcast,83.0,86.0,FALSE,yes
rainy,70.0,96.0,FALSE,yes
rainy,68.0,80.0,FALSE,yes
rainy,65.0,70.0,TRUE,no
overcast,64.0,65.0,TRUE,yes
sunny,72.0,95.0,FALSE,no
sunny,69.0,70.0,FALSE,yes
rainy,75.0,80.0,FALSE,yes
sunny,75.0,70.0,TRUE,yes
overcast,72.0,90.0,TRUE,yes
overcast,81.0,75.0,FALSE,yes
rainy,71.0,91.0,TRUE,no
%
%
%