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source/c13/p06_executing_external_command_and_get_its_output.rst

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out_bytes = subprocess.check_output('grep python | wc > out', shell=True)
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需要注意的是在shell中执行命令会存在一定的安全风险,特别是当参数来自于用户输入时。
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这时候可以使用 ``shlex.quote()`` 函数来讲参数正确的用双引用引起来
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这时候可以使用 ``shlex.quote()`` 函数来将参数正确的用双引用引起来
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