擅长:python、mysql、java
<pre><code>>>> import copy
>>> L = [[1,2,3]]
>>> A = copy.copy(L)
>>> A[0].append(4)
>>> A
[[1, 2, 3, 4]]
>>> L
[[1, 2, 3, 4]]
>>> L = [[1,2,3]]
>>> A = copy.deepcopy(L)
>>> A[0].append(4)
>>> A
[[1, 2, 3, 4]]
>>> L
[[1, 2, 3]]
</code></pre>