擅长:python、mysql、java
<p>使用<code>reduce</code>和<code>operator.getitem</code>:</p>
<pre><code>from operator import getitem
reduce(getitem, L, D)[K] = V
</code></pre>
<p><strong>输出:</strong></p>
<pre><code>>>> from pprint import pprint
>>> pprint(D)
{'outermost': {'inner': {'key1': 'add a value',
'key2': '',
'key3': '',
'key4': '',
'key5': ''}}}
</code></pre>