擅长:python、mysql、java
<p>Python有<code>groupby</code>:</p>
<pre><code>>>> from itertools import groupby
>>> s = 'aabbccc'
>>> [k for k, g in groupby(s)]
['a', 'b', 'c']
</code></pre>
<blockquote>
<p>Question 1: How do I properly declare the matrix to use it for this?</p>
</blockquote>
<p>矩阵是列表的列表。您可以这样声明:<code>m = [[x,y] for x in range(3) for y in range(3)]</code></p>