如何使文件上传与Deform和Colander兼容？

pip install deform colander

from deform import Form
from colander import Schema, SchemaNode, String, Integer, FileData
from deform.widget import FileUploadWidget

class FileUploadSchema(Schema):
    file = SchemaNode(FileData(), widget=FileUploadWidget())

file_upload_form = Form(FileUploadSchema(), buttons=('Upload',))

from deform.exception import ValidationFailure

def handle_file_upload(request):
    if request.method == 'POST':
        try:
            file_data = request.POST['file'].file
            # 处理文件数据，例如将其保存到服务器
            return {'status': 'success'}
        except ValidationFailure as e:
            return {'status': 'error', 'message': str(e)}
    else:
        file_upload_form = Form(FileUploadSchema(), buttons=('Upload',))
        return {'form': file_upload_form.render()}

<form method="POST" enctype="multipart/form-data">
    {{ form.csrf_token }}
    {{ form.render() }}
   <button type="submit">Upload</button>
</form>