Python Flask-RESTful: 'AttributeError: 'function' object has no attribute 'items'' 解决方法

The error 'AttributeError: 'function' object has no attribute 'items'' occurs because the fields.Nested() function should receive a dictionary of field attributes, but in your code, you are passing a lambda function instead.

To fix this issue, you need to define the person_task_fields dictionary before using it inside the fields.Nested() function. Here's the corrected code:

from flask_restful import fields

person_task_fields = {
    'children': fields.List(fields.Nested(lambda: person_task_fields)),
}

By defining the person_task_fields dictionary before using it, the lambda function will have access to the dictionary's attributes, and the error will be resolved.