[docs] [issue21557] os.popen & os.system lack shell-related security warnings

[STINNER Victor]

STINNER Victor added the comment:

Python 3.5 doc has no red warning in the subprocess module, but a nice section:
https://docs.python.org/dev/library/subprocess.html#security-considerations

Why not simply copying the note of the subprocess doc?
"Note: Read the Security Considerations section before using shell=True."

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