arff

Weka arff file type reader for python.

http://code.google.com/p/arff/

http://code.google.com/p/arff/wiki/Documentation

Usage:

>>> import arff
>>> for row in arff.load('example.arff'):
...     print(row.hair_color)
...     print(row[-1])
...
>>> print(list(arff.load('example.arff')))
[[Row(hair_color='blonde', age=17.2, patno=1),
 Row(hair_color='blue', age=27.2, patno=2),
 Row(hair_color='blue', age=18.2, patno=3)]

Where this is the example file:

@relation diabetics_data @attribute hair_color {blonde, black, blue} @attribute age real @attribute patno integer @data blonde, 17.2, 1 blue, 27.2, 2 blue, 18.2, 3

---

>>> data = [[1,2,'a'], [3, 4, 'john']]
>>> arff.dump('result.arff', data, relation="whatever", names=['num', 'day', 'title'])

results in the creation of this file:

@relation whatever @attribute num integer @attribute day integer @attribute title string @data 1,2,'a' 3,4,'john'

---

supports arff types: numeric, integer, real, string supports python types: int, str, float

in the future: dates

Tested on python 2.7 and 3.2

License: BSD, do what you wish with this. Could be awesome to hear if you found it useful and/or you have suggestions. ubershmekel at gmail

Based on http://weka.wikispaces.com/ARFF+%28stable+version%29