seek() 接受 2 个位置参数，但给出了 3 个

Question

我正在将图像上传到内存，然后我想将其保存到 imageField()。

我使用 django-storages 将文件从 image/fileField() 上传到 AWS S3。

我将图像下载到内存中：

        r = requests.get(url, headers=header)
        image = Image.open(BytesIO(r.content))
        image_in_memory = InMemoryUploadedFile(image, None, "foo.png",  'image/png', image.size, None)
        image_in_memory_file = image_in_memory.file

一些验证：

print(type(image_in_memory))

---
<class 'django.core.files.uploadedfile.InMemoryUploadedFile'>

当我保存这个时：

my_object.cover.save(name="foo.png", content=image_in_memory)

Django 产生这个错误：

web_1      |     link.cover.save(name="foo.png", content=image_in_memory)
web_1      |   File "/usr/local/lib/python3.7/site-packages/django/db/models/fields/files.py", line 87, in save
web_1      |     self.name = self.storage.save(name, content, max_length=self.field.max_length)
web_1      |   File "/usr/local/lib/python3.7/site-packages/django/core/files/storage.py", line 52, in save
web_1      |     return self._save(name, content)
web_1      |   File "/usr/local/lib/python3.7/site-packages/storages/backends/s3boto3.py", line 491, in _save
web_1      |     self._save_content(obj, content, parameters=parameters)
web_1      |   File "/usr/local/lib/python3.7/site-packages/storages/backends/s3boto3.py", line 505, in _save_content
web_1      |     content.seek(0, os.SEEK_SET)
web_1      | TypeError: seek() takes 2 positional arguments but 3 were given

你发现问题了吗？

Answer 1

出于某种原因，您将文件包装在 Pillow Image 类中。 Image seek 方法适用于图像序列，正如错误所解释的，它采用两个位置参数。

不要将其包装为图像：

r = requests.get(url, headers=header)
image = BytesIO(r.content)
image_in_memory = InMemoryUploadedFile(image, None, "foo.png",  'image/png', len(r.content), None)

还请注意，还有一个更简单的类 SimpleUploadedFile，它只需要名称和内容，这可能就是您需要的：

r = requests.get(url, headers=header)
image_in_memory = SimpleUploadedFile("foo.png", r.content, 'image/png')