Python 翻译 C saxpy

Question

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Answer 1

您将 parray[:] = 更改为 parray =，这不是等价的。前者在元素基础上分配 parray 的内容，如果 parray 与分配的右侧不是同一类型，这是一个重要的区别。

考虑两种情况:

>>> xs = [1, 2, 3, 4]
>>> xs[:] = tuple(2 * x for x in xs)
>>> xs
[2, 4, 6, 8]
>>> type(xs)
<class 'list'>

>>> xs = [1, 2, 3, 4]
>>> xs = tuple(2 * x for x in xs)
>>> xs
(2, 4, 6, 8)
>>> type(xs)
<class 'tuple'>