python中ImmutableMultiDict嵌套字典的值获取和解决400状态码的问题

在写接口的过程中遇到了一次请求状态码400

原因是用element upload组件上传照片，后端采用flask的时候用request.form读取上传携带的其他参数，

data    = request.form
  title = data['title']
  author  = data['author']
  content = data['content']

这样获取就会请求报错出现400，此时的data为ImmutableMultiDict

修改：使用to_dict()方法转一下就OK了

data    = request.form.to_dict()
  title = data['title']
  author  = data['author']
  content = data['content']

顺便记录一下前端使用的时候

<el-upload class="upload-demo"
                ref="upload"
                action="/api/write/diary"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                :file-list="fileList"
                :auto-upload="false"
                :data=filedata>
        <el-button slot="trigger"
                        size="small"
                        type="primary">选取文件</el-button>
        <div slot="tip"
                class="el-upload__tip"></div>
</el-upload>