擅长:python、mysql、java
<p>您可以在<a href="https://docs.python.org/2/library/string.html#format-examples" rel="nofollow">nested arguments and complex examples</a>中看到我的解决方案的相同示例</p>
<pre><code>for a in b.keys():
for c in b[a]:
print '{key:{fill}{align}20} {item}'.format(key=key + ' ', fill='-', align='<', item=b[key])
</code></pre>