This seems only tangentially related. The point of something like sh.py is to ease the use of external commands you need to use. The functions that shelljs part

This seems only tangentially related. The point of something like sh.py is to ease the use of external commands you need to use. The functions that shelljs partially implements (cd, pwd, ls, find, cp, rm, mv, mkdir, test, cat, sed, grep, which, echo, exit, env) are already trivially accomplished in Python.