Flask 'tuple' object 在保存文件时没有属性 'write'

Question

当我想保存在发布请求中收到的文件时，我在 flask 上收到此有线错误。 我尝试调试，但我不明白该错误，因为我使用 flask 保存，并且在 google 和其他堆栈溢出问题上，我发现这与 python 文件 API 相关，但没有打开或错误的标志，但没有任何标志，或者不需要在这里打开任何文件。

我如何发送文件：

const uploadFile = async (file) =>{
  const formData = new FormData();
  formData.append("file", file);
  fetch("http://localhost:5000/files/upload", {method: "POST", body: formData});
}

我如何接收文件：

@app.route('/files/upload', methods = ['POST'])
def recive_upload_file():
    file = request.files['file']
    filename = file.filename
    root_dir = os.path.dirname(os.getcwd())
    file.save((os.path.join(root_dir,'backend', 'upload'), filename))
    return "done"

据我所知，文件发送正确，因为如果我尝试在 recive_uploaded_file function 中打印文件名，我会得到正确的名称。

错误：

Traceback (most recent call last):
  File "c:\Python37\lib\site-packages\flask\app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "c:\Python37\lib\site-packages\flask\app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "c:\Python37\lib\site-packages\flask_cors\extension.py", line 161, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
  File "c:\Python37\lib\site-packages\flask\app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "c:\Python37\lib\site-packages\flask\_compat.py", line 39, in reraise
    raise value
  File "c:\Python37\lib\site-packages\flask\app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "c:\Python37\lib\site-packages\flask\app.py", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "index.py", line 239, in upload_file
    file.save((os.path.join(root_dir,'backend', 'upload'), filename))
  File "c:\Python37\lib\site-packages\werkzeug\datastructures.py", line 3070, in save
    copyfileobj(self.stream, dst, buffer_size)
  File "c:\Python37\lib\shutil.py", line 82, in copyfileobj
    fdst.write(buf)
AttributeError: 'tuple' object has no attribute 'write'

Answer 1

我发现了这个问题。 我的路径错误，文件名应该在 os.path.join()

file.save((os.path.join(root_dir,'backend', 'upload', filename)))

Answer 2

您指定的文件路径不正确。 您正在尝试将元组作为文件路径写入：

>>> root_dir =  '/root/'
>>> filename = 'test.png'
>>> (os.path.join(root_dir,'backend', 'upload'), filename)
('/root/backend/upload', 'test.png')

您应该在os.path.join调用中移动文件名。

>>> os.path.join(root_dir,'backend', 'upload', filename)
'/root/backend/upload/test.png'