Reverse string in python

ReverseString.py

#!/usr/bin/env python

# iterative
string = "testing"
newstring = ""
for s in string[:]:
    newstring = s + newstring
print newstring

# recursive
def rev(n):
    if len(n) == 1:
        return n
    else:
        return rev(n[1:]) + n[:1]
print rev(string)

# native step
string[::-1]

Recursive: 10000 loops, best of 3: 28.7 usec per loop
Iterative: 100000 loops, best of 3: 7.92 usec per loop
Native step: 100000000 loops, best of 3: 0.0189 usec per loop

python -mtimeit -s'import revrec' 'revrec.rev("/usr/src/kernels/3.10.0-121.el7.x86_64/include/config/bt/bnep/proto/filter.h")'

python -mtimeit -s'import rev' 'rev.rev()'

python -m timeit -s 'str="/usr/src/kernels/3.10.0-121.el7.x86_64/include/config/bt/bnep/proto/filter.h"; str[::-1]'