datastructures.py 文件源码

def add_file(self, name, file, filename=None, content_type=None):
        """Adds a new file to the dict.  `file` can be a file name or
        a :class:`file`-like or a :class:`FileStorage` object.

        :param name: the name of the field.
        :param file: a filename or :class:`file`-like object
        :param filename: an optional filename
        :param content_type: an optional content type
        """
        if isinstance(file, FileStorage):
            value = file
        else:
            if isinstance(file, string_types):
                if filename is None:
                    filename = file
                file = open(file, 'rb')
            if filename and content_type is None:
                content_type = mimetypes.guess_type(filename)[0] or \
                    'application/octet-stream'
            value = FileStorage(file, filename, name, content_type)

        self.add(name, value)