英文:
What is the meaning of reverse=[i]+reverse
问题
reverse = [i] + reverse 这行代码的意思是将当前迭代的元素 i 放在已经反转部分的列表 reverse 的前面。它实际上是在逐步地构建一个反转后的列表。这是一种逐步反转列表的方法，不使用任何内置函数或方法。
英文:
I'm writing code in python to reverse a string and stumble upon this code.
lst = [21,2,3,1,96,55,66,12,19]
reverse = []
for i in lst:
print([i])
reverse = [i] + reverse
Wants to know what is the meaning of reverse=[i]+reverse, what does it do ?
I'm trying to reverse a list without using any function or built in methods.
I was thinking of something simple which doesn't involve any functions.
答案1
得分: 2
[i]只是一个包含一个元素i的列表字面值。- 在此之上调用
+ reverse，以生成一个新列表，该列表以i开始，并以来自reverse列表的所有元素结尾。 - 最后，
reverse被重新赋值以指向这个新列表。
实际上，这是逐个元素地构建反转列表。
英文:
[i]is just a list literal containing one element,i.+ reverseis called on that, to produce a new list that starts withi, and
ends with all the elements from thereverselist.- Finally,
reverseis re-assigned to point to this new list.
In effect, this is building up the reversed list one element at a time.
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