Python循环引用 [英] Python circular references

问题描述

试图在同一文件中有两个相互引用的类。进行此工作的最佳方法是什么：

trying to have two class that reference each others, in the same file. What would be the best way to have this working:

class Foo(object):
    other = Bar

class Bar(object):
    other = Foo

if __name__ == '__main__':
    print 'all ok'

？

问题似乎是由于属性在类上，因为它试图在类本身被解析后立即执行。

The problem seems to be that since the property is on the class, since it tries to executes as soon as the class itself is parsed.

有办法解决吗？

编辑：

这些键用于SQLAlchemy映射，它们实际上是类变量（不是实例）。

those keys are used for SQLAlchemy mapping, to they realy are class variables (not instance).

推荐答案

此会做你想做的事：

class Foo(object):
    pass

class Bar(object):
    pass

Foo.other = Bar
Bar.other = Foo

不过，我宁愿完全避免这种设计。

I would prefer to avoid such design completely, though.

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