擅长:python、mysql、java
<p>使用<a href="https://docs.python.org/tutorial/datastructures.html#list-comprehensions" rel="nofollow noreferrer">list comprehension</a>
在<a href="https://www.python.org/dev/peps/pep-0274/" rel="nofollow noreferrer">dictionary comprehension</a>内:</p>
<pre><code>x = {'town1': {'thames': 'moderate', 'bourton': 'low'}, 'town2': {'river cam': 'high'}, 'town3': {'dickler': 'moderate', 'mil': 'severe'}}
y = {k: [v for k, v in v.items()] for k, v in x.items()}
print(y)
# {'town1': ['moderate', 'low'], 'town2': ['high'], 'town3': ['moderate', 'severe']}
</code></pre>