Python: files in dir

gistfile1

import os
import sys

def main():
    if len(sys.argv) < 2:
        sys.stderr.write("usage: scriptname source_dir")
        sys.exit(1)

    source_dir = sys.argv[1]
    try:
        files = os.listdir(source_dir)
    except OSError as e:
        sys.stderr.write("Cannot retrieve file names: "+str(e))
        sys.exti(1)

    for f in files:
        fname = os.path.join(source_dir, f)
        with open(fname, "r") as fh:
            pass  # this is where you do stuff

if __name__ == '__main__':
    main()