sort lines python vs bash

tyrion@aws:~/src/bash$ cat sort.sh
sort < $1 > $2
tyrion@aws:~/src/bash$ cat sort1.py
import sys

inp = open(sys.argv[1], 'r')
out = open(sys.argv[2], 'w')

out.writelines(sorted(inp))
tyrion@aws:~/src/bash$ time sh sort.sh input.txt out.txt

real    0m0.065s
user    0m0.032s
sys     0m0.032s
tyrion@aws:~/src/bash$ rm out.txt
tyrion@aws:~/src/bash$ time sh sort.sh input.txt out.txt

real    0m0.011s
user    0m0.000s
sys     0m0.008s
tyrion@aws:~/src/bash$ rm out.txt
tyrion@aws:~/src/bash$ time sh sort.sh input.txt out.txt

real    0m0.011s
user    0m0.004s
sys     0m0.004s
tyrion@aws:~/src/bash$ rm out.txt
tyrion@aws:~/src/bash$ time python -S sort1.py input.txt out.txt

real    0m0.015s
user    0m0.004s
sys     0m0.008s
tyrion@aws:~/src/bash$ rm out.txt
tyrion@aws:~/src/bash$ time python -S sort1.py input.txt out.txt

real    0m0.014s
user    0m0.000s
sys     0m0.012s

# Without the -S performances are worse

tyrion@aws:~/src/bash$ rm out.txt
tyrion@aws:~/src/bash$ time python sort1.py input.txt out.txt

real    0m0.031s
user    0m0.020s
sys     0m0.012s