[issue7950] subprocess.Popen documentation should contain a good warning about the security implications when using shell=True

[Chris Rebert]

Changes by Chris Rebert <pybugs at rebertia.com>:


Added file: http://bugs.python.org/file18209/subprocess.rst.diff

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7950>
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