listdir of files

#!/usr/bin/python
#[email protected]
#takes a directory as a command line argument. it lists the dir
import sys
import re
import os
def List(dir):
    filenames = os.listdir(dir)
    for filename in filenames:
        path = os.path.join(dir, filename)
        print os.path.abspath(path)

#main() to dump file to screen
def main():
    List(sys.argv[1])

#boilerplate main() call.
if __name__=='__main__':
   main()