python对象转字典

1.基础实现

 class TestDict:
     name = "wyb"
     age = ""

     def __init__(self):
         self.gender = 'male'

     def keys(self):                         # 获取字典的键
         s = ('name', 'age', 'gender')
         return s

     def __getitem__(self, item):            # 获取键对应的值
         return getattr(self, item)          # getattr获取对象下某个属性的值

 o = TestDict()
 print(dict(o))          # 创建字典 -> 先调用对象下的keys方法再用o["xxx"]获取值([]本质上是调用对象下的__getitem__方法)

2.进阶实现

 class Base(object):
     def __init__(self):
         self.fields = []

     def __getitem__(self, item):
         return getattr(self, item)

     def keys(self):
         return self.fields

     def hide(self, *keys):                  # 隐藏域
         for key in keys:
             self.fields.remove(key)
         return self

     def append(self, *keys):                # 添加域
         for key in keys:
             self.fields.append(key)
         return self

 class Sx(Base):
     name = "wyb"
     age = 21

     def __init__(self):
         super(Base, self).__init__()
         self.gender = 'male'
         # self.fields定义默认输出字段
         self.fields = ["name", "age"]

 o1 = Sx()
 print(dict(o1))
 o2 = Sx()
 print(dict(o2.hide("age")))
 o3 = Sx()
 print(dict(o3.append("gender")))

 # 输出结果:
 # {'name': 'wyb', 'age': 21}
 # {'name': 'wyb'}
 # {'name': 'wyb', 'age': 21, 'gender': 'male'}