擅长:python、mysql、java
<p>这适用于任何长度的词典:</p>
<pre><code>>>> result = {}
>>> for d in L:
... result.update(d)
...
>>> result
{'a':1,'c':1,'b':2,'d':2}
</code></pre>
<p>作为<a href="https://www.python.org/dev/peps/pep-0274/" rel="noreferrer">comprehension</a>:</p>
<pre><code># Python >= 2.7
{k: v for d in L for k, v in d.items()}
# Python < 2.7
dict(pair for d in L for pair in d.items())
</code></pre>