擅长:python、mysql、java
<pre><code>>>> from collections import defaultdict
>>> list1 = ["123", "123", "123", "456"]
>>> list2 = ["0123", "a123", "1234", "null"]
>>> d = defaultdict(list)
>>> for i, key in enumerate(list1):
... d[key].append(list2[i])
...
>>> d
defaultdict(<type 'list'>, {'123': ['0123', 'a123', '1234'], '456': ['null']})
>>>
</code></pre>