如果您了解所有这些内容，为什么不以Pythonic的方式来做呢？比较另一个需要清除的类：tempfile.TemporaryDirectory。

with TemporaryDirectory() as tmp:
    # ...
# tmp is deleted

def foo():
    tmp = TemporaryDirectory()
foo()
# tmp is deleted

他们如何做到这一点？这是相关的位：

import weakref
class Foo():
    def __init__(self, name):
        self.name = name
        self._finalizer = weakref.finalize(self, self._cleanup, self.name)
        print("%s reporting for duty!" % name)

    @classmethod
    def _cleanup(cls, name):
        print("%s feels forgotten! Bye!" % name)

    def cleanup(self):
        if self._finalizer.detach():
            print("%s told to go away! Bye!" % self.name)

def foo():
    print("Calling Arnold")
    tmpfoo = Foo("Arnold")
    print("Finishing with Arnold")

foo()
# => Calling Arnold
# => Arnold reporting for duty
# => Finishing with Arnold
# => Arnold feels forgotten. Bye!

def bar():
    print("Calling Rocky")
    tmpbar = Foo("Rocky")
    tmpbar.cleanup()
    print("Finishing with Rocky")

bar()
# => Calling Rocky
# => Rocky reporting for duty!
# => Rocky told to go away! Bye!
# => Finishing with Rocky

weakref.finalize将_cleanup在对象被垃圾回收时触发，或者在程序结束时（如果它仍在周围）触发。我们可以保留finalizer，以便可以明确杀死对象（使用detach）并将其标记为死对象，以便不调用finalizer（当我们要手动处理清理操作时）。

如果您想使用来支持上下文用法with，那么添加__enter__和__exit__方法是很简单的，只需调用cleanupin
__exit__（如上所述的“手动清理”）即可。