擅长:python、mysql、java
<p>将<code>delta_value()</code>更改为:</p>
<pre><code>def delta_value(direction):
diff = cmp(value2, value1) # -1 for <, 0 for ==, 1 for >
if direction == "increase": diff = -dif
return diff
</code></pre>
<p><em>…同时。。。</em></p>
<p>代替<code>exec</code>,您现在可以:</p>
^{pr2}$
<p>Diff为正或负,而不是“+”或“-”</p>