Python在父类中使用派生类的方法？

Question

我可以强制父类调用派生类的函数版本吗？

class Base(object):
    attr1 = ''
    attr2 = ''

    def virtual(self):
        pass               # doesn't do anything in the parent class

    def func(self):
        print "%s, %s" % (self.attr1, self.attr2)
        self.virtual()

以及派生自它的类

class Derived(Base):
    attr1 = 'I am in class Derived'
    attr2 = 'blah blah'

    def virtual(self):
        # do stuff...
        # do stuff...

清除模糊:

d = Derived()
d.func()         # calls self.virtual() which is Base::virtual(), 
                 #  and I need it to be Derived::virtual()

Answer 1

如果您实例化一个Derived(例如d = Derived())，.virtual 将被d.func 调用() 是 Derived.virtual。如果没有涉及 Derived 的实例，那么 Derived.virtual 就没有合适的 self ，当然不可能调用它。