Code Style - not really good list manipulation example - needs explanation

In the Code Style chapter examples - Short Ways to Manipulate Lists there is an example "Add three to all list members."

"bad"

for i in range(len(a)):
    a[i] += 3

"good"

a = [i + 3 for i in a]

Unfortunately the "bad" and "good" examples do a different things:

• "bad" modifies the original list in place
• "good" creates a new modified list and does not change the original object - not exactly "Add three to all list members."

Although the "good" code looks cleaner the result could be unwanted for example in case of huge lists or required side-effect of modifying the original list. The code at least needs an explanation.

打开 writing/style.html 中的 Code Style 章节，阅读“Short Ways to Manipulate Lists”部分。比较两个列表示例，并更新周围的说明，明确它们在原地修改和创建新列表时的不同行为；当读者理解每个示例何时会修改原始列表时，即视为完成。