如何检测python子类中的方法重载? [英] How to detect method overloading in subclasses in python?

问题描述

我有一个类是许多其他类的超类.我想知道(在我的超类的 __init__() 中)子类是否覆盖了特定的方法.

I have a class that is a super-class to many other classes. I would like to know (in the __init__() of my super-class) if the subclass has overridden a specific method.

我试图用一个类方法来完成这个，但结果是错误的:

I tried to accomplish this with a class method, but the results were wrong:

class Super:
   def __init__(self):
      if self.method == Super.method:
         print 'same'
      else:
         print 'different'
     
   @classmethod
   def method(cls):
      pass

class Sub1(Super):
   def method(self):
      print 'hi'
  
class Sub2(Super):
   pass

Super() # should be same
Sub1() # should be different
Sub2() # should be same

>>> same
>>> different
>>> different

有没有办法让超类知道子类是否覆盖了一个方法?

Is there any way for a super-class to know if a sub-class has overridden a method?

推荐答案

您可以使用自己的装饰器.但这是一个技巧，仅适用于您控制实现的类.

You can use your own decorator. But this is a trick and will only work on classes where you control the implementation.

def override(method):
  method.is_overridden = True
  return method

class Super:
   def __init__(self):
      if hasattr(self.method, 'is_overridden'):
         print 'different'
      else:
         print 'same'
   @classmethod
   def method(cls):
      pass

class Sub1(Super):
   @override
   def method(self):
      print 'hi'

class Sub2(Super):
   pass

Super() # should be same
Sub1() # should be different
Sub2() # should be same

>>> same
>>> different
>>> same

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