擅长：python、mysql、java
<p>首先，我们以csv格式读取数据，将其转换为第一列的数组和切片：</p>
<pre><code>df = pd.read_csv(a).to_numpy()[:, 1:]
</code></pre>
<hr/>
<pre><code>array([[0, 3313, 2963],
[3313, 0, 1318],
[2963, 1318, 0]], dtype=object)
</code></pre>
<hr/>
<p><strong>注意</strong>我在<code>a</code>中看到您的csv如下：</p>
<pre><code>a = StringIO('''
"","Athens","Barcelona","Brussels"
"Athens",0,3313,2963
"Barcelona",3313,0,1318
"Brussels",2963,1318,0
''')
</code></pre>
