hongweipeng <hongweichen8...@sina.com> added the comment:

It seems to me the problem is related to nested `finally` or `with`, which 
can't handle signals well.

class Event:
    ...
    def wait(self, timeout=None):
        self._cond.__enter__()
        signaled = self._flag
        if not signaled:
            signaled = self._cond.wait(timeout)
        self._cond.__exit__()
        return signaled


Reducing one layer of nesting can solve this issue,but it can't pass `test` 
module.

----------
nosy: +hongweipeng

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34486>
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