ImportError: No module named arff

Question

Here's a simple code as in this link to read an arff file in python (the commented one didn't work too):

import arff
for row in arff.load('heart_train.arff'):
        print(row.sex)  

And here's the error I receive:

python id3.py 
Traceback (most recent call last):
  File "id3.py", line 1, in <module>
    import arff
ImportError: No module named arff

"heart_train" arff file data is like:

@relation cleveland-14-heart-disease
@attribute 'age' real
@attribute 'sex' { female, male}
@attribute 'cp' { typ_angina, asympt, non_anginal, atyp_angina}
@attribute 'trestbps' real
@attribute 'chol' real
@attribute 'fbs' { t, f}
@attribute 'restecg' { left_vent_hyper, normal, st_t_wave_abnormality}
@attribute 'thalach' real
@attribute 'exang' { no, yes}
@attribute 'oldpeak' real
@attribute 'slope' { up, flat, down}
@attribute 'ca' real
@attribute 'thal' { fixed_defect, normal, reversable_defect}
@attribute 'class' { negative, positive}
@data
63,male,typ_angina,145,233,t,left_vent_hyper,150,no,2.3,down,0,fixed_defect,negative
37,male,non_anginal,130,250,f,normal,187,no,3.5,down,0,normal,negative
41,female,atyp_angina,130,204,f,left_vent_hyper,172,no,1.4,up,0,normal,negative
56,male,atyp_angina,120,236,f,normal,178,no,0.8,up,0,normal,negative
57,female,asympt,120,354,f,normal,163,yes,0.6,up,0,normal,negative
57,male,asympt,140,192,f,normal,148,no,0.4,flat,0,fixed_defect,negative
...

Knocker

did you have this line in your code: import arff ? – Treponema

yeah, I had. It just didn't get copied. – Knocker

Actually it is in the question but doesn't show!!!?! – Knocker

Answer 1

You should rename your script from arff.py to something different, arfftest.py for example. Python cant import arff module you need because name of it is the same as your app file name.

And if you havent installed arff package itself, install it with pip or easy_install:

pip install arff
# or easy_install arff
# or pypm install arff

Treponema

Monas-MacBook-Pro: mona$ python id3.py Traceback (most recent call last): File "id3.py", line 1, in <module> import arff ImportError: No module named arff – Knocker

@MonaJalal that error means that python cant find arff. Did you installed it? – Treponema

Thanks I installed it using pypm install arff I am receiving this error: ` python id3.py Traceback (most recent call last): File "id3.py", line 3, in <module> print(row.sex) File "/Users/mona/Library/Python/2.7/lib/python/site-packages/arff/__init__.py", line 102, in getattr return object.__getattr__(self, key) AttributeError: type object 'object' has no attribute 'getattr'` – Knocker

which python version you ve ? its Tested on python 2.7 and 3.2 – Philippopolis

Answer 2

After I change your, arff file it works:

NB: I removed the single code from the second column of the attribute.

Here is the arff file:

@relation cleveland-14-heart-disease
@attribute age real
@attribute sex { female, male}
@attribute cp { typ_angina, asympt, non_anginal, atyp_angina}
@attribute trestbps real
@attribute chol real
@attribute fbs { t, f}
@attribute restecg { left_vent_hyper, normal, st_t_wave_abnormality}
@attribute thalach real
@attribute exang { no, yes}
@attribute oldpeak real
@attribute slope { up, flat, down}
@attribute ca real
@attribute thal { fixed_defect, normal, reversable_defect}
@attribute class { negative, positive}
@data
63,male,typ_angina,145,233,t,left_vent_hyper,150,no,2.3,down,0,fixed_defect,negative
37,male,non_anginal,130,250,f,normal,187,no,3.5,down,0,normal,negative
41,female,atyp_angina,130,204,f,left_vent_hyper,172,no,1.4,up,0,normal,negative
56,male,atyp_angina,120,236,f,normal,178,no,0.8,up,0,normal,negative
57,female,asympt,120,354,f,normal,163,yes,0.6,up,0,normal,negative
57,male,asympt,140,192,f,normal,148,no,0.4,flat,0,fixed_defect,negative

Snippet and output:

:/tmp:~ cat a.py
import arff
for row in arff.load('heart_train.arff'):
   print(row.sex)
:/tmp:~ python a.py
male
male
female
male
female
male
:/tmp:~
male
:/tmp:~

Philippopolis