single_thread_bzip.py

import os
import sys


for roots, dirlist , filelist in os.walk(os.curdir):
    for file in [os.path.join(roots,filegot) for filegot in filelist]:
        if "bz2" not in file:
            print "Compressing %s" % (file)
            os.system("bzip2 %s" % file)
            print ":DONE"