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Mon Nov 1 17:10:32 CET 2010 · https://mail.python.org/pipermail/python-dev/2010-November/105160.html

On 2010/10/31 6:24, brian.curtin wrote:
> Author: brian.curtin
> Date: Sat Oct 30 23:24:21 2010
> New Revision: 85987
>
> Log:
> Fix #10257. Clear resource warnings by using os.popen's context manager.
>
>
> Modified:
>     python/branches/py3k/Lib/test/test_os.py
>
> Modified: python/branches/py3k/Lib/test/test_os.py
> ==============================================================================
> --- python/branches/py3k/Lib/test/test_os.py	(original)
> +++ python/branches/py3k/Lib/test/test_os.py	Sat Oct 30 23:24:21 2010
> @@ -406,17 +406,19 @@
>           os.environ.clear()
>           if os.path.exists("/bin/sh"):
>               os.environ.update(HELLO="World")
> -            value = os.popen("/bin/sh -c 'echo $HELLO'").read().strip()
> -            self.assertEquals(value, "World")
> +            with os.popen("/bin/sh -c 'echo $HELLO'") as popen:
> +                value = popen.read().strip()
> +                self.assertEquals(value, "World")

Does this really cause resource warning? I think os.popen instance
won't be into traceback because it's not declared as variable. So I
suppose it will be deleted by reference count == 0 even when exception
occurs.

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Showing content from https://mail.python.org/pipermail/python-dev/2010-November/105160.html below:

[Python-Dev] [Python-checkins] r85987 - python/branches/py3k/Lib/test/test_os.py