擅长:python、mysql、java
<p>在此处找到答案:<a href="http://docs.python.org/library/sys.html" rel="nofollow">http://docs.python.org/library/sys.html</a></p>
<blockquote>
<p><em>sys.exit([arg])</em> </p>
<p>Exit from Python. <strong>This is implemented by raising the SystemExit exception</strong>, so cleanup actions specified by finally clauses of try statements are honored, and it is possible to intercept the exit attempt at an outer level.</p>
</blockquote>
<p>^{cd1>}通过引发异常来工作。所以你的exceptive块才会执行。</p>