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Unfortunately, I don't think including implicit shlex.quote() calls is going to have the effect I was originally looking for:
>>> subprocess.call("du -hs ../py*", shell=True)
593M ../py3k
577M ../py3k_pristine
479M ../python27
300M ../python31
381M ../python32
288K ../python_swallowed_whole
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>>> subprocess.call("du -hs {}".format(shlex.quote("../py*")), shell=True)
du: cannot access `../py*': No such file or directory
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However, tinkering with this did provide some other "feels like using the shell" examples:
>>> subprocess.call("du -hs ~/devel", shell=True)
4.5G /home/ncoghlan/devel
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>>> subprocess.call(["du","-hs","~/devel"])
du: cannot access `~/devel': No such file or directory
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(I'm using the existing subprocess calls rather than the proposed API, since I'm playing with this on the current hg tip without making any changes)