如何在 Python 中反转单词
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How to reverse words in Python
提问by Vadim Kovrizhkin
How do I reverse words in Python?
如何在 Python 中反转单词？
For instance:
例如：
SomeArray=('Python is the best programming language')
i=''
for x in SomeArray:
#i dont know how to do it
print(i)
The result must be:
结果必须是：
egaugnal gnimmargorp tseb eht si nohtyP
please help. And explain.
PS:
I can't use [::-1]. I know about this. I must do this in an interview, using only loops :)
请帮忙。并解释。
PS：
我不能用[::-1]。我知道这件事。我必须在面试中做到这一点，只使用循环:)
回答by alecxe
>>> s = 'Python is the best programming language'
>>> s[::-1]
'egaugnal gnimmargorp tseb eht si nohtyP'
UPD:
更新：
if you need to do it in a loop, you can use range to go backwards:
如果您需要在循环中执行此操作，则可以使用 range 向后移动：
>>> result = ""
>>> for i in xrange(len(s)-1, -1, -1):
... result += s[i]
...
>>> result
'egaugnal gnimmargorp tseb eht si nohtyP'
or, reversed():
或者，reversed()：
>>> result = ""
>>> for i in reversed(s):
... result += i
...
>>> result
'egaugnal gnimmargorp tseb eht si nohtyP'
回答by zedutchgandalf
A string in Python is an array of chars, so you just have to traverse the array (string) backwards. You can easily do this like this:
Python 中的字符串是字符数组，因此您只需向后遍历数组（字符串）即可。你可以像这样轻松地做到这一点：
"Python is the best programming language"[::-1]
This will return "egaugnal gnimmargorp tseb eht si nohtyP".
这将返回"egaugnal gnimmargorp tseb eht si nohtyP"。
[::-1]traverses an array from end to start, one character at a time.
[::-1]从头到尾遍历一个数组，一次一个字符。
