I just tried it on my laptop:
$ python --version
$ time python every-second-item-reversed.py in.txt > pyout.txt
$ perl -v
This is perl 5, version 18, subversion 2 (v5.18.2) built for x86_64-li
$ time perl every-second-item-reversed-haukex.py in.txt > haukex-out.t
No differences in the two output files. However, note Perl 5.24.1 is faster than both Python 2.7.12 and Perl 5.18.1:
$ perl5.24.1 -v
This is perl 5, version 24, subversion 1 (v5.24.1) built for x86_64-li
$ time perl5.24.1 every-second-item-reversed-haukex.py in.txt > haukex
And also Python 3.4 is slower than any of the above:
$ python3.4 --version
$ time python3.4 every-second-item-reversed.py in.txt > pyout-3.4.txt
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