python - 如何用Python中的新类继承来替换动态继承？

Question

所以我有这些操作系统特定的类和一些其他类，这些类根据我们执行的操作系统从其中一个继承。问题是，我真的不喜欢我用来检查条件的动态方式(我想出的唯一方式)，所以我想创建一个新类，它只检查条件，然后返回适当的类我可以用来继承。这就是我所拥有的:

import os

class NewClass(object):
  def __init__(self, name):
    self.name = name

  def AnotherMethod(self):
    print 'this is another method for the base class ' + self.name

  def SomeMethod(self):
    raise NotImplementedError('this should be overridden')

class MacClass(NewClass):
  def __init__(self, name):
    super(MacClass, self).__init__(name)

  def SomeMethod(self):
    print 'this is some method for Mac ' + self.name

class WinClass(NewClass):
  def __init__(self, name):
    super(WinClass, self).__init__(name)

  def SomeMethod(self):
    print 'this is some method for Windows ' + self.name


class Foo(MacClass if os.name == 'posix' else WinClass):
  def __init__(self):
    super(Foo, self).__init__('foo')

my_obj = Foo()

#On Mac:  
my_obj.SomeMethod() #this is some method for Mac foo
my_obj.AnotherMethod() #this is some method for Mac foo

#On Win:
my_obj.SomeMethod() #this is some method for Win foo
my_obj.AnotherMethod() #this is some method for Win foo

我想做的事:

class Class(NewClass):
  - some way to automagically return MacClass or WinClass depending on the OS

class Foo(Class):
  def __init__(self):
    super(Foo, self).__init__('foo')

my_obj = Foo()

如果我想要其他类想要继承这个类，这种方式也会更好，所以我不会每次都进行检查

Answer 1

您可以在 Foo 之外执行 if:

OsSpecificClass = MacClass if os.name == 'posix' else WinClass

然后继承OsSpecificClass。