擅长:python、mysql、java
<p>您可以从<code>foo</code>和<code>bar</code>构建字典并使用列表理解:</p>
<pre><code>a = dict([next(x.iteritems()) for x in foo])
b = dict([next(x.iteritems()) for x in bar])
sub_dict = dict([(key, round(a[key] - b.get(key, 0), 1)) for key in a])
</code></pre>
<p>输出:</p>
^{pr2}$