Welcome to the CHICKEN Scheme pasting service

$ cat ~/misc/find-files.py 
import os.path

def find_files(dir):
    results = []
    for root, dirs, files in os.walk(dir):
        results += [os.path.join(root, file) for file in files + dirs]
    return results

find_files(".")


$ cat ~/misc/find-files.scm 
(use posix)
(find-files "." dotfiles: #t)


$ time python ~/misc/find-files.py 

real    0m0.468s
user    0m0.312s
sys     0m0.144s


$ time csi -s ~/misc/find-files.scm 

real    0m0.765s
user    0m0.584s
sys     0m0.176s