如何在 Python 中反转列表？
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How can I reverse a list in Python?
提问by Leo.peis
How can I do the following in Python?
如何在 Python 中执行以下操作？
array = [0, 10, 20, 40]
for (i = array.length() - 1; i >= 0; i--)
I need to have the elements of an array, but from the end to the beginning.
我需要有一个数组的元素，但是从头到尾。
采纳答案by codaddict
回答by mechanical_meat
>>> L = [0,10,20,40]
>>> L[::-1]
[40, 20, 10, 0]
Extended slice syntax is explained well in the Python What's new Entry for release 2.3.5
扩展切片语法在 Python What's new Entry for release 中有很好的解释2.3.5
By special request in a comment this is the most current slice documentation.
根据评论中的特殊要求，这是最新的切片文档。
回答by Swiss
for x in array[::-1]:
do stuff
回答by ghostdog74
>>> L = [0,10,20,40]
>>> L.reverse()
>>> L
[40, 20, 10, 0]
Or
或者
>>> L[::-1]
[40, 20, 10, 0]
回答by nonopolarity
array=[0,10,20,40]
for e in reversed(array):
print e
回答by John Machin
The most direct translation of your requirement into Python is this forstatement:
将您的需求最直接地翻译成 Python 是以下for语句：
for i in xrange(len(array) - 1, -1, -1):
print i, array[i]
This is rather cryptic but may be useful.
这相当神秘，但可能有用。
回答by Pawan Kumar
For reversing the same list use:
要反转相同的列表，请使用：
array.reverse()
To assign reversed list into some other list use:
要将反向列表分配到其他列表中，请使用：
newArray = array[::-1]
回答by robertmoggach
Strictly speaking, the question is not how to return a list in reverse but rather how to reverse a list with an example list name array.
严格来说，问题不是如何反向返回列表，而是如何使用示例列表名称反向返回列表array。
To reverse a list named "array"use array.reverse().
反转名为"array"use的列表array.reverse()。
The incredibly useful slice method as described can also be used to reverse a list in place by defining the list as a sliced modification of itself using array = array[::-1].
所描述的非常有用的 slice 方法也可用于通过使用array = array[::-1].
回答by fahad
This is to duplicate the list:
这是复制列表：
L = [0,10,20,40]
p = L[::-1] # Here p will be having reversed list
This is to reverse the list in-place:
这是就地反转列表：
L.reverse() # Here L will be reversed in-place (no new list made)
回答by koo
Use list comprehension:
使用列表理解：
[array[n] for n in range(len(array)-1, -1, -1)]
