繼承Python的`屬性`

Question

在我的一個類中，我有許多屬性在獲取和設置方面做了非常類似的事情。所以，我抽象的參數property到工廠功能：

def property_args(name): 
    def getter(self): 
     # do something 
     return getattr(self, '_' + name) 
    def setter(self, value) 
     # do something 
     setattr(self, '_' + name, value) 
    return getter, setter 

class MyClass(object): 
    def __init__(self): 
     self._x = None 
    x = property(*property_args('x')) # obviously there's more than one of these IRL 

但是，因爲我已經發現property實際上是一個類，繼承它會爲這個完美的。我在文檔中找不到任何解釋我需要重寫的內容（以及__init__等的參數簽名），並且我並不想在C源代碼中尋找它。有誰知道我在哪裏可以找到這些信息？

Answer 1

這裏是一個純Python等效的代碼財產（）：

class Property(object): 
    "Emulate PyProperty_Type() in Objects/descrobject.c" 

    def __init__(self, fget=None, fset=None, fdel=None, doc=None): 
     self.fget = fget 
     self.fset = fset 
     self.fdel = fdel 
     if doc is None and fget is not None: 
      doc = fget.__doc__ 
     self.__doc__ = doc 

    def __get__(self, obj, objtype=None): 
     if obj is None: 
      return self 
     if self.fget is None: 
      raise AttributeError("unreadable attribute") 
     return self.fget(obj) 

    def __set__(self, obj, value): 
     if self.fset is None: 
      raise AttributeError("can't set attribute") 
     self.fset(obj, value) 

    def __delete__(self, obj): 
     if self.fdel is None: 
      raise AttributeError("can't delete attribute") 
     self.fdel(obj) 

    def getter(self, fget): 
     return type(self)(fget, self.fset, self.fdel, self.__doc__) 

    def setter(self, fset): 
     return type(self)(self.fget, fset, self.fdel, self.__doc__) 

    def deleter(self, fdel): 
     return type(self)(self.fget, self.fset, fdel, self.__doc__) 

Answer 2

property是descriptor，所以你必須覆蓋（或重新實現，一個新的對象）的__get__(), __set__(), and __delete__() methods。