擅长:python、mysql、java
<p>使用<a href="https://docs.python.org/2/library/subprocess.html#popen-constructor" rel="noreferrer">^{<cd2>}</a>的<code>preexec_fn</code>参数:</p>
<blockquote>
<p>If <code>preexec_fn</code> is set to a callable object, this object will be called in the child process just before the child is executed. (Unix only)</p>
</blockquote>
<p>示例:</p>
<pre><code>>>> Popen(["nice"]).communicate()
0
(None, None)
>>> Popen(["nice"], preexec_fn=lambda : os.nice(10)).communicate()
10
(None, None)
>>> Popen(["nice"], preexec_fn=lambda : os.nice(20)).communicate()
19
(None, None)
</code></pre>