file.py 文件源码

def has_file(self):
        """Return ``True`` if ``self.data`` is a
        :class:`~werkzeug.datastructures.FileStorage` object.

        .. deprecated:: 0.14.1
            ``data`` is no longer set if the input is not a non-empty
            ``FileStorage``. Check ``form.data is not None`` instead.
        """

        warnings.warn(FlaskWTFDeprecationWarning(
            '"has_file" is deprecated and will be removed in 1.0. The data is '
            'checked during processing instead.'
        ))
        return bool(self.data)