Python 继承中 super 运用

Question

测试 1

代码段

#!/usr/bin/env python
# -*- coding: utf-8 -*-

class ChildA(object):
  def foo(self):
    print '--ChildA--'

class ChildB(ChildA):
  def foo(self):
    print '--ChildB--'
    super(ChildB, self).foo()

class ChildC(ChildA):
  def foo(self):
    print '--ChildC--'
    # super(ChildC, self).foo()

class ChildD(ChildB, ChildC):
  def foo(self):
    print '--ChildD--'
    super(ChildD, self).foo()

ChildD().foo()

执行结果如下

--ChildD--
--ChildB--
--ChildC--

测试 2

代码段

#!/usr/bin/env python
# -*- coding: utf-8 -*-

class ChildA(object):
  def foo(self):
    print '--ChildA--'

class ChildB(ChildA):
  def foo(self):
    print '--ChildB--'
    super(ChildB, self).foo()

class ChildC(ChildA):
  def foo(self):
    print '--ChildC--'
    super(ChildC, self).foo()

class ChildD(ChildB, ChildC):
  def foo(self):
    print '--ChildD--'
    super(ChildD, self).foo()

ChildD().foo()

执行结果如下

--ChildD--
--ChildB--
--ChildC--
--ChildA--

测试 3

代码段

#!/usr/bin/env python
# -*- coding: utf-8 -*-

class ChildA(object):
  def foo(self):
    print '--ChildA--'

class ChildB(ChildA):
  def foo(self):
    print '--ChildB--'
    # super(ChildB, self).foo()

class ChildC(ChildA):
  def foo(self):
    print '--ChildC--'
    super(ChildC, self).foo()

class ChildD(ChildB, ChildC):
  def foo(self):
    print '--ChildD--'
    super(ChildD, self).foo()

ChildD().foo()

执行结果如下

--ChildD--
--ChildB--

测试 4

代码段

#!/usr/bin/env python
# -*- coding: utf-8 -*-

class ChildA(object):
  def foo(self):
    print '--ChildA--'

class ChildB(ChildA):
  def foo(self):
    print '--ChildB--'
    # super(ChildB, self).foo()

class ChildC(ChildA):
  def foo(self):
    print '--ChildC--'
    # super(ChildC, self).foo()

class ChildD(ChildB, ChildC):
  def foo(self):
    print '--ChildD--'
    super(ChildD, self).foo()

ChildD().foo()

执行结果如下

--ChildD--
--ChildB--

问题提出

比较上面的结果，super 是怎么影响 mro 的呢

Answer 1

http://stackoverflow.com/questions/5033903/python-super-method-and-cal...

http://blog.csdn.net/johnsonguo/article/details/585193