擅长:python、mysql、java
<pre><code>>>> myList = []
>>> for i in myDict.values():
... for j in i.keys():
... if j not in myList: myList.append(j)
... else: continue
...
>>> myList
['1998', '2000', '1999']
</code></pre>
<p>编辑:我更喜欢@Kasra的回答:)</p>