从python中获取容器/父对象 [英] Getting container/parent object from within python
本文介绍了从python中获取容器/父对象的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
在Python中,是否可以从Bar内部获取包含另一个对象Bar的对象,Foo?这里是我的意思的例子
In Python, is it possible to get the object, say Foo, that contains another object, Bar, from within Bar itself? Here is an example of what I mean
class Foo(object):
def __init__(self):
self.bar = Bar()
self.text = "Hello World"
class Bar(object):
def __init__(self):
self.newText = foo.text #This is what I want to do,
#access the properties of the container object
foo = Foo()
这可能吗?感谢!
推荐答案
将引用传递给Bar对象,如下所示:
Pass a reference to the Bar object, like so:
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.text
foo = Foo()
$ b b
编辑:@thomleo指出,这可能会导致垃圾回收问题。建议的解决方案在 http://eli.thegreenplace.net/ 2009/06/12 / safely-using-destructors-in-python / ,看起来像
as pointed out by @thomleo, this can cause problems with garbage collection. The suggested solution is laid out at http://eli.thegreenplace.net/2009/06/12/safely-using-destructors-in-python/ and looks like
import weakref
class 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.text
foo = Foo()
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