擅长:python、mysql、java
<p>因为错误说明:在第二个参数中提供的是一个目录。它必须是本地(目标)文件名。在</p>
<p><a href="http://docs.python.org/library/urllib.html#urllib.urlretrieve" rel="nofollow">python docs</a>状态(强调我的):</p>
<blockquote>
<p>The second argument, if present, specifies the <em>file location</em> to copy to (if absent, the location will be a tempfile with a generated name).</p>
</blockquote>