从python中获取容器父对象

传递对Bar对象的引用，如下所示：

class Foo(object):    def __init__(self):        self.text = "Hello World"  # has to be created first, so Bar.__init__ can reference it        self.bar = Bar(self)class Bar(object):    def __init__(self, parent):        self.parent = parent        self.newText = parent.textfoo = Foo()

编辑：
正如@thomleo指出的那样，这可能导致垃圾回收问题。建议的解决方案位于http://eli.thegreenplace.net/2009/06/12/safely-
using-destructors-in-python/中
，看起来像

import weakrefclass Foo(object):    def __init__(self):        self.text = "Hello World"        self.bar = Bar(self)class Bar(object):    def __init__(self, parent):        self.parent = weakref.ref(parent)    # <= garbage-collector safe!        self.newText = parent.textfoo = Foo()