[issue34346] dir() hangs interpreter

[Steven D'Aprano]

Steven D'Aprano <steve+python at pearwood.info> added the comment:

I don't think the description you give is very accurate. The description in the file splat.py says:

"Hangs/core dumps Python2 when instantiated"

(which is it? hang or core dump?)

but I can't replicate that. Instantiating A() is fine for me. (Tested in Python 2.7 on Linux.)

The whole business about "splat" is amusing but irrelevant. I can replicate the hang (no core dump) using this simpler example:

class B:
    def __getattr__(self, name):
        return name in dir(self)


Instantiating the class is fine, but calling dir() on it locks up:

>>> b = B()
>>> dir(b)

[1]+  Stopped                 python2.7 -E

(after typing Ctrl-Z in the xterm). Notice that B is an old-style class in this example. The same behaviour also occurs when inheriting from object.

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nosy: +steven.daprano

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<https://bugs.python.org/issue34346>
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