Visual recognition of local file with Watson

Question

I believe this is a simple question. When using the Watson API via Python, I have no issues running it to detect an image URL. However, I do have trouble doing it for local picture files.

My code:

from watson_developer_cloud import VisualRecognitionV3 as vr
instance = vr('2016-05-20', api_key='Your-Api-key')
img2 = instance.classify(images_file='a.jpg')
print(img2)

The error output is:

AttributeError: 'str' object has no attribute 'name'
--------------------------------------------------------------------------- AttributeError                            Traceback (most recent call last) <ipython-input-173-79c8a4eee873> in <module>()
----> 1 img2 = instance.classify(images_file='a.jpg') C:\Program Files\Anaconda3\lib\site-packages\watson_developer_cloud\visual_recognition_v3.py in classify(self, images_file, images_url, classifier_ids, owners, threshold)
    154                   'owners': owners, 'threshold': threshold}
    155         return self._image_call('/v3/classify', images_file, images_url,
--> 156                                 params)
    157 
    158     def detect_faces(self, images_file=None, images_url=None): C:\Program Files\Anaconda3\lib\site-packages\watson_developer_cloud\visual_recognition_v3.py in _image_call(self, url, images_file, images_url, params)

    124                                 accept_json=True)
    125         else:
--> 126             filename = images_file.name
    127             mime_type = mimetypes.guess_type(
    128                 filename)[0] or 'application/octet-stream' 

AttributeError: 'str' object has no attribute 'name'

I am using rodeo IDE. I have tried changing the working directory to the image folder or inputting C:/... etc., but neither of these work.

I believe it is the way I pass the argument, can someone guide me?

Essentially, what does

AttributeError: 'str' object has no attribute 'name'

Mean?

parsethis · Accepted Answer · 2017-02-21T08:10:50.783

3

you have to pass it a file not the name of the file. so try:

img2 = instance.classify(images_file=open('a.jpg', 'rb'))

notice that now you're passing a file object with open('a.jpg', 'rb') rather than a str object 'a.jpg' To answer the question about the error, python str objects don't have name attributes, which is exactly what the error is saying.

refer to the example at the watson python sdk github: visual recognition example

edited Feb 21 '17 at 08:10

answered Feb 21 '17 at 07:47

parsethis

7,998
3
29
31

thank you for the prompt reply. I am not very proficient at python as of now. However i am getting this error: UnicodeDecodeError: 'charmap' codec can't decode byte 0x81 in position 240: character maps to – Germ Feb 21 '17 at 08:01
I edited to my answer to reflect the fact that your may need to read the file as binary. Notice the 'rb' (read binary) option added to the open function. – parsethis Feb 21 '17 at 08:07
thank you so much, I start python with R background. Therefore, this seems ailen to me. As such, for any argument that requires a file to be pass, i have to do the open option? And from where do you realized that it must be 'rb'? I believe guiding me through the thought process will be good for me to learn :) – Germ Feb 21 '17 at 08:12
if a file is required as an argument then yes you need to open the file location with open(file_name). To answer you second question here is the python documentation https://docs.python.org/2/library/functions.html#open. – parsethis Feb 21 '17 at 08:16

score 1 · Answer 2 · answered Feb 21 '17 at 08:12

1

ok, so:

file = open('img_to_classify.jpg', 'rb')
img2 = instance.classify(images_file=file)
print(img2)

answered Feb 21 '17 at 08:12

Cristi Vlad

81
7

Visual recognition of local file with Watson

2 Answers2