python 随笔(property & __class__)

　　1. 属性装饰器：

      property

     

    @property
    def errors(self):
        """
        Returns a list of form.errors for every form in self.forms.
        """
        if self._errors is None:
            self.full_clean()
        return self._errors

　　cached_property

    @cached_property
    def forms(self):
        """
        Instantiate forms at first property access.
        """
        # DoS protection is included in total_form_count()
        forms = [self._construct_form(i) for i in xrange(self.total_form_count())]
        return forms

　　2. 对象的父类名称

    对象所属的类: object.__class__   

     cls.__bases__ (因为父类可能不止一个,所以复数)

    因此对象的父类名称为集合: [x.__name__ for x in object.__class__.bases__]