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跟版网的小编来一起学习吧！
问题描述
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()
Is this possible? Thanks!
解决方案
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()
Edit: 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()
这篇关于从 python 中获取容器/父对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！
本站部分内容来源互联网,如果有图片或者内容侵犯了您的权益，请联系我们，我们会在确认后第一时间进行删除！