Clojure launcher script written in Python

clj.py

#!/usr/bin/env python

import os
import sys

class_path = []

dot_clojure = os.path.join(os.environ['HOME'], '.clojure')
dot_jars = os.path.join(os.environ['HOME'], '.jars')

for filename in os.listdir(dot_clojure):
    if filename[-4:] == '.jar':
        class_path.append(os.path.join(dot_clojure, filename))

for filename in os.listdir(dot_jars):
    if filename[-4:] == '.jar':
        class_path.append(os.path.join(dot_jars, filename))

class_path_str = ':'.join(class_path)

os.execvp('rlwrap', [
    'rlwrap',
    'java', '-cp', class_path_str,
    'jline.ConsoleRunner', 'clojure.main'
    ] + sys.argv[1:])