How do I initialize a dictionary of empty lists in Python?
<p>My attempt to programmatically create a dictionary of lists is failing to allow me to individually address dictionary keys. Whenever I create the dictionary of lists and try to append to one key, all of them are updated. Here's a very simple test case:</p>

<pre><code>data = {}
data = data.fromkeys(range(2),[])
data[1].append('hello')
print data
</code></pre>

<p>Actual result: <code>{0: ['hello'], 1: ['hello']}</code></p>

<p>Expected result: <code>{0: [], 1: ['hello']}</code></p>

<p>Here's what works</p>

<pre><code>data = {0:[],1:[]}
data[1].append('hello')
print data
</code></pre>

<p>Actual and Expected Result: <code>{0: [], 1: ['hello']}</code></p>

<p>Why is the <code>fromkeys</code> method not working as expected?</p>
