from flask_smorestfields import Uploadclass UploadArgSchemaArgSchema file = Upload description=待上传文件 required=True error_messages=required 待上传文件不能为空 如果fule字段有三个选择1和2都是上传默认图片如果是3的话就上传图片且三个

To achieve this requirement, you can modify the UploadArgSchema class as follows:

from flask_smorest.fields import Upload
from marshmallow import validate

class UploadArgSchema(ArgSchema):
    file = Upload(
        description='待上传文件', required=True, error_messages={'required': '待上传文件不能为空'},
        validate=validate.OneOf(['1', '2', '3'])
    )

In the above code, we added the validate argument to the Upload field and specified validate.OneOf(['1', '2', '3']) as the validator. This ensures that only the values '1', '2', or '3' are allowed for the file field