Django/Python 'int' object is not subscriptable

Question

at my models.py i got a class named Post with and ImageField called postcover. I want to save every image in PNG format which is working fine so far but i have no idea how i could keep the actual image aspectio ratio after processing the image.

with the following solution i get the following error:

'int' object is not subscriptable

models.py

class Post(models.Model):
...
postcover = fields.ImageField(
        verbose_name="Post Cover",
        blank=True,
        null=True,
        upload_to=get_file_path_user_uploads,
        validators=[default_image_size, default_image_file_extension]
    )
...
def save(self, *args, **kwargs):
    super(Post, self).save(*args, **kwargs)
    if self.postcover:
        if os.path.exists(self.postcover.path):
            imageTemproary = Image.open(self.postcover)
            outputIoStream = BytesIO()
            baseheight = 500
            hpercent = (baseheight / float(self.postcover.size[1]))
            wsize = int((float(self.postcover.size[0]) * float(hpercent)))
            imageTemproaryResized = imageTemproary.resize((wsize, baseheight))
            imageTemproaryResized.save(outputIoStream, format='PNG')
            outputIoStream.seek(0)
            self.postcover = InMemoryUploadedFile(outputIoStream, 'ImageField',
                                                  "%s.png" % self.postcover.name.split('.')[0], 'image/png',
                                                  sys.getsizeof(outputIoStream), None)
    super(Post, self).save(*args, **kwargs)

full trace:

 Internal Server Error: /post/2/edit/
 Traceback (most recent call last):
   File "/usr/local/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner
     response = get_response(request)
   File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py", line 126, in _get_response
     response = self.process_exception_by_middleware(e, request)
   File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py", line 124, in _get_response
     response = wrapped_callback(request, *callback_args, **callback_kwargs)
   File "/app/app_Accounts/decorators.py", line 33, in _wrapped_view
     return view_func(request, *args, **kwargs)
   File "/usr/local/lib/python3.6/site-packages/ratelimit/decorators.py", line 30, in _wrapped
     return fn(*args, **kw)
   File "/app/app/views.py", line 473, in post_edit
     post.save()
   File "/app/app/models.py", line 204, in save
     hpercent = (baseheight / float(self.postcover.size[1]))
 TypeError: 'int' object is not subscriptable

Thanks for help in advance :)

Please include the full traceback of the exception; in the web view there is a 'text only' link for this. — Martijn Pieters
– Martijn Pieters, Commented Apr 2, 2019 at 21:14
And what is self.postcover here? Is it a file object? If so, then .size can't be an image size (tuple with width and height), perhaps you meant to use imageTemproary.size instead? — Martijn Pieters
– Martijn Pieters, Commented Apr 2, 2019 at 21:16
Then self.postcover.size is not a tuple. That's the file size in bytes. Use imageTemproary.size. — Martijn Pieters
– Martijn Pieters, Commented Apr 2, 2019 at 21:50

Martijn Pieters · Accepted Answer · 2019-04-02 21:52:40Z

1

You are trying to treat the file size as a tuple with width and height. You want to use imageTemproary.size instead, not self.postcover.size:

hpercent = baseheight / imageTemproary.size[1]
wsize = int(imageTemproary.size[0] * hpercent)

I've simplified the code too, you are using Python 3, where / produces a float value even if the inputs are both integers (true division, not floor division).

You may want to correct the spelling of the image object variable (imageTemporary); personally I'd just use image.

answered Apr 2, 2019 at 21:52

Martijn Pieters

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