python - 在 Python 中使用 super() 关键字的单继承的基本示例是什么？

Question

假设我设置了以下类:

class Foo:
     def __init__(self, frob, frotz):
          self.frobnicate = frob
          self.frotz = frotz
class Bar:
     def __init__(self, frob, frizzle):
          self.frobnicate = frob
          self.frotz = 34
          self.frazzle = frizzle

我如何(如果可以的话)在这种情况下使用 super() 来消除重复代码？

Answer 1

假设您希望类 Bar 在其构造函数中设置值 34，这将起作用:

class Foo(object):
     def __init__(self, frob, frotz):
          self.frobnicate = frob
          self.frotz = frotz

class Bar(Foo):
     def __init__(self, frob, frizzle):
          super(Bar, self).__init__(frob, frizzle)
          self.frotz = 34
          self.frazzle = frizzle


bar = Bar(1,2)
print "frobnicate:", bar.frobnicate
print "frotz:", bar.frotz
print "frazzle:", bar.frazzle

然而，super 引入了它自己的复杂性。参见例如super considered harmful .为了完整起见，这里是没有 super 的等效版本。

class Foo(object):
     def __init__(self, frob, frotz):
          self.frobnicate = frob
          self.frotz = frotz

class Bar(Foo):
     def __init__(self, frob, frizzle):
          Foo.__init__(self, frob, frizzle)
          self.frotz = 34
          self.frazzle = frizzle


bar = Bar(1,2)
print "frobnicate:", bar.frobnicate
print "frotz:", bar.frotz
print "frazzle:", bar.frazzle