擅长:python、mysql、java
<p>这很少是个好主意,但您需要的是一个对象类型的数组:</p>
<pre><code>>>> a = np.empty((5,), dtype=object)
>>> a
array([None, None, None, None, None], dtype=object)
>>> a[0] = []
>>> a
array([[], None, None, None, None], dtype=object)
>>> a[0].append(4)
>>> a
array([[4], None, None, None, None], dtype=object)
</code></pre>