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。
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