小的辅助类，提供一个能把复杂对象转为dict的方法

to_dict_mixin.py

# -*- coding: utf-8 -*
"""
把一个复杂对象转为一个字典
"""


class ToDictMixin(object):
    def to_dict(self):
        return self._traverse_dict(self.__dict__)

    def _traverse_dict(self, instance_dict):
        pass

    def _traverse(self, key, value):
        if isinstance(value, ToDictMixin):
            return value.to_dict()
        elif isinstance(value, dict):
            return self._traverse_dict(value)
        elif isinstance(value, list):
            return [self._traverse(key, i) for i in value]
        elif hasattr(value, '__dict__'):
            return self._traverse_dict(value.__dict__)
        else:
            return value