How to change order of characters in a string? Python

Question

I have a string "ATCGATCG" and I want it to be reversed so its "GCTAGTCA". I thought about using:

data_r2[total:]+s[0]

Where total is the result from a counting script I have which will count the number of characters in the string. I realise that this will rotate the string and just end up with the same order if totally rotated which isn't what I want at all.

Does anyone know how to do this so it is the input string reversed so the right most character is now the left most character etc?

score 1 · Answer 1 · answered May 02 '14 at 16:32

1

"ATCGATCG"[::-1] == "GCTAGCTA"

This uses slice notation, from the start to the end stepping by negative one.

answered May 02 '14 at 16:32

Adam Smith

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It's also probably a million different duplicates on SO :) – Adam Smith May 02 '14 at 16:33
This doesn't produce the OP's desired output. He could have made a typo though... – May 02 '14 at 16:33
@iCodez ha I didn't actually read the desired output! I'm assuming that MUST be a typo. If not, please let me know OP and further clarify your question – Adam Smith May 02 '14 at 16:34
Yeah it was a typo, as I said I wanted to reverse the string which this does so thank you so much for this. – thh32 May 02 '14 at 19:22

score 0 · Answer 2 · answered May 02 '14 at 16:42

0

Alternative but slower way.

In [2]: s="ATCGATCG"

In [3]: ''.join(reversed(s))
Out[3]: 'GCTAGCTA'

answered May 02 '14 at 16:42

Padraic Cunningham

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How to change order of characters in a string? Python

2 Answers2