Question

在我的models.py中，我得到了一个名为Post的类和一个名为postcover的ImageField。我想将所有图像保存为PNG格式，到目前为止效果还不错，但是我不知道在处理完图像后如何保持实际的图像纵横比。

使用以下解决方案时，出现以下错误：

'int'对象不可下标

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)

完整跟踪：

 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

首先感谢您的帮助：）

Answer 1

您正在尝试将文件大小视为具有宽度和高度的元组。您想使用imageTemproary.size而不是self.postcover.size：

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

我也简化了代码，您使用的是Python 3，即使输入都是整数（真除法，也不是底数除法），/也会产生浮点值。

您可能需要更正图像对象变量（imageTemporary）的拼写；我个人只是使用image。

Django / Python'int'对象不可下标

1 个答案: