擅长:python、mysql、java
<p>另一种方式:</p>
<pre><code>extend_list = lambda list, len=5, fill_with='': map(lambda e1, e2: e1 if e2 is None else e2, [fill_with]*len, list)
print extend_list([1, 2, 3])
>>> [1, 2, 3, '', '']
print extend_list([1, 2], 3, '?')
>>> [1, 2, '?']
</code></pre>