Python 2.7 append values to dictionary
<p>I have 2 dictionaries with identical keys.</p>

<pre><code>d1 = {'Dog':[7,2],'Cat':[5,2]}
d2 = {'Dog':1,'Cat':4}
</code></pre>

<p>Is there a good way of combining them so that I can have one dictionary that looks like this?</p>

<pre><code>d = {'Dog':[7,2,1],'Cat':[5,2,4]}
</code></pre>