Sort files with extensions

sort_files.py

import os
import sys
import shutil

def join_path(*arg):
    return os.path.join(current_path, *arg)

current_path = os.getcwd()
files = [ f for f in os.listdir(current_path) if\
          os.path.isfile(os.path.join(current_path, f)) and f != "sort_files.py" ]
directory = [ f for f in os.listdir(current_path) if not\
          os.path.isfile(join_path(f)) ]
extensions = []

for f in files:
    ext = f.split(".")[-1]
    try:
        os.mkdir(join_path(ext))
        #print ext
    except:
        pass
    shutil.move(join_path(f), join_path(ext, f))
#print extensions