Reverse list of strings python [One Liner]

Question

I am trying to reverse a list of strings. For instance

one two three

will be output as

three two one

I have tried this

[x for x in range(input()) [" ".join(((raw_input().split())[::-1]))]]

but I am getting an error:

 TypeError: list indices must be integers, not str

Possible duplicate of [How can I reverse a list in python?](http://stackoverflow.com/questions/3940128/how-can-i-reverse-a-list-in-python) — rfj001, Dec 24 '15 at 18:17
I need to achieve this in single line and need the output as a string. I know to reverse a string. The issue is when I try to create a single line code. — saleem, Dec 24 '15 at 18:21

Adem Öztaş · Answer 1 · 2015-12-24T18:25:02.087

2

>>> ' '.join("one two three".split()[::-1])
'three two one'

you can use like this,

>>> ' '.join(raw_input().split()[::-1])
one two three
'three two one'

edited Dec 24 '15 at 18:25

answered Dec 24 '15 at 18:16

Adem Öztaş

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Might help to actually explain why the OP's code did not work – Padraic Cunningham Dec 24 '15 at 18:20
2

This is already in the code, it throws type error when I create a single line code. I am trying codegolf to be frank – saleem Dec 24 '15 at 18:23

score 2 · Answer 2 · answered Dec 24 '15 at 18:27

2

>>> t="one two three"
>>> " ".join( reversed(t.split()) )
'three two one'

answered Dec 24 '15 at 18:27

Copperfield

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score 1 · Answer 3 · answered Dec 24 '15 at 18:18

1

If you want to use raw_input() try this:

>>> " ".join((raw_input().split())[::-1])
one two three
'three two one'

answered Dec 24 '15 at 18:18

Delimitry

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Padraic Cunningham · Accepted Answer · 2015-12-24T18:41:21.630

To actually address your code and why it fails with an error, you are trying to index the range list with a str i.e " ".join((raw_input().split()[::-1])):

range(input())[" ".join((raw_input().split()[::-1]))]

You would need to loop over the inner list for your code to run without error:

 [s for x in range(input()) for s in [" ".join((raw_input().split()[::-1]))]]

Which would output something like:

2
foo bar
foob barb
['bar foo', 'barb foob']

And can simplify to:

[" ".join((raw_input().split()[::-1])) for _ in range(input())]

If you want a single string just call join on the outer list, I would also recommend using int(raw_input(... generally but I know you are code golfing.

Reverse list of strings python [One Liner]

4 Answers4