String reversal in Python

Question

I have taken an integer input and tried to reverse it in Python but in vain! I changed it into a string but still I am not able to. Is there any way to reverse it ? Is there any built-in function?

I am not able to convert the integer into a list so not able to apply the reverse function.

This is a duplicate: http://stackoverflow.com/questions/931092/reverse-a-string-in-python/931095#931095 — Paolo Bergantino, Jun 14 '09 at 01:42

score 30 · Accepted Answer · edited Jun 13 '09 at 16:31

30

You can use the slicing operator to reverse a string:

s = "hello, world"
s = s[::-1]
print s  # prints "dlrow ,olleh"

To convert an integer to a string, reverse it, and convert it back to an integer, you can do:

x = 314159
x = int(str(x)[::-1])
print x  # prints 951413

edited Jun 13 '09 at 16:31

jfs

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answered Jun 13 '09 at 16:07

Adam Rosenfield

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renamed str -> s to avoid confusion with builtin str – jfs Jun 13 '09 at 16:31

score 4 · Answer 2 · answered Jun 13 '09 at 16:07

4

Code:

>>> n = 1234
>>> print str(n)[::-1]
4321

answered Jun 13 '09 at 16:07

Macarse

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score 2 · Answer 3 · answered Jun 13 '09 at 16:09

2

>>> int(''.join(reversed(str(12345))))
54321

answered Jun 13 '09 at 16:09

Armandas

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Note: Not as pythonic as the slicing operator solution. – Macarse Jun 13 '09 at 16:24

String reversal in Python

3 Answers3

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