How do you reverse the letters in a string?

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reverse a string in Python

I'm trying to understand how to reverse the letters in a string. Let's say that I have hello and am looking for the output olleh how would I implement this using the list as a tool?

@Johnsyweb: What?!? Check out the `array` module, and be enlightened. — Ethan Furman, Oct 08 '11 at 06:36
This is part of my answer to http://stackoverflow.com/questions/7694977/how-do-you-reverse-the-words-in-a-string-using-python-manually — Ethan Furman, Oct 08 '11 at 06:39
This is not a duplicate. The duplicate mentioned does not explain how to reverse a string using lists. — locoboy, Oct 08 '11 at 13:45
@cfarm54, why do you want to use lists? What's wrong with just reversing the string? — Winston Ewert, Oct 08 '11 at 13:46
@EthanFurman: Apologies, I meant there is no `array` built-in with Python. Clearly there are array implementations. The OP changed this to `list` anyway. — johnsyweb, Oct 08 '11 at 20:19
@Johnsyweb: It's not builtin, but it is part of the stdlib and has been since before 1.5. — Ethan Furman, Oct 08 '11 at 20:59
@EthanFurman: I understand that. Again, apologies for the confusion. — johnsyweb, Oct 08 '11 at 21:00

Amber · Answer 1 · 2011-10-08T05:41:10.657

Using slice notation,

forwards = "hello"
backwards = forwards[::-1]

(The third section of slice notation is the step; in this case, -1 makes it step backwards through the entirety of the string, effectively reversing it.)

or, using the reversed() function:

backwards = ''.join(reversed(forwards))

(Note that without the ''.join(), you'd get a <reversed object at 0x1215a10> instead.)

>>> print backwards
olleh

score 2 · Answer 2 · answered Oct 08 '11 at 05:37

2

With slice notation:

string = "Hello!"
reversed_string = string[::-1]

answered Oct 08 '11 at 05:37

Michael Foukarakis

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How do you reverse the letters in a string?

2 Answers2