擅长:python、mysql、java
<p>使用<a href="http://docs.python.org/2/library/stdtypes#mutable-sequence-types" rel="nofollow">^{<cd1>}</a>:</p>
<pre><code>>>> a = [1, 2, 3]
>>> a.insert(0, 0)
>>> a
[0, 1, 2, 3]
</code></pre>
<p>使用切片分配:</p>
<pre><code>>>> a = [1, 2, 3]
>>> a[:0] = [0]
>>> a
[0, 1, 2, 3]
</code></pre>
<p><strong>根据标签更改更新。你知道吗</p>
<p>使用<a href="http://docs.scipy.org/doc/numpy/reference/generated/numpy.insert.html" rel="nofollow">^{<cd2>}</a>:</p>
<pre><code>>>> a = np.array([1, 2, 3])
>>> np.insert(a, 0, 0)
array([0, 1, 2, 3])
</code></pre>
<p>或<a href="http://docs.scipy.org/doc/numpy/reference/generated/numpy.hstack.html" rel="nofollow">^{<cd3>}</a>:</p>
<pre><code>>>> np.hstack([[0], a])
array([0, 1, 2, 3])
</code></pre>