Browsing Lobsters, I stumbled upon a thread, someone talking about reversing a string on a word basis using C while in retrospect they could just have used awk. I decided to give it a shot but make it more challenging by using a one-liner. Once again I am amazed by the power of the coreutils, it almost feels like cheating:

tr " " "\n" | awk '/^\S+$/' | rev | tr "\n" " "

But I’m afraid the poster was wrong, the Python version is shorter:

" ".join(x[::-1] for x in s.split())

It’s probably even shorter in Perl, but I don’t know enough of it to compare.