Cleaner: get rid of old files in a directory

cleaner.py

# Shamelessly stolen from https://www.quora.com/As-a-programmer-what-tasks-have-you-automated-to-make-your-everyday-life-easier/answer/Cory-Engdahl?srid=tVE5
# 
# Usage:
# python cleaner.py -f [full/path/to/folder]
# arguments
#   -p, --path : fully qualified path to folder (required)
#   -d, --days : Age in days of the file to delete (optional, default is 1 day)
#   -e, --exclude: name of files to save (optional)
#   -i, --include: name of files to delete regardless of timeframe (optional)

import sys,getopt
import os
import time
import shutil
import logging

def main(argv): 
    delete_always = []
    delete_never = []
    delete_after_days = 1
    delete_after = delete_after_days * 24
    delete_path= '/Users/username/Downloads/'

    try:
        opts, args = getopt.getopt(argv, "p:d:e:i:", ["path=", "days=", "exclude=", "include="])
    except getopt.GetoptError:
        print "error with directory"
        sys.exit(2)
    for opt, arg in opts:
        if opt in ("-p", "--path"):
            delete_path= arg
        elif opt in ("-d", "--days"):
            delete_after_days = arg
        elif opt in ("-e", "--exclude"):
            delete_never = arg
        elif opt in ("-i", "--include"):
            delete_always = arg
            
    
    logging.basicConfig(format='%(asctime)s %(message)s', filename=delete_path+'cleanup.log', level=logging.INFO)
    
    def rotten_file(file):
        name, ext = os.path.splitext(file)
        return (time.time() - os.path.getmtime(delete_path +
                file) > (delete_after*3600))
    
    def precious_file(file):
        name, ext = os.path.splitext(file)
        return ext in delete_never
    
    def worthless_file(file):
        name, ext = os.path.splitext(file)
        return ext in delete_always
    
    # files to evaluate
    contents = []
    
    # omit hidden files
    for file in os.listdir(delete_path):
        if not file.startswith('.'):
            contents.append(file)
    
    # begin log
    logging.info('Cleaning Directory')
    
    # evaluate all files
    for file in contents:
        fullpath =  delete_path + file
        if (not rotten_file(file) and not worthless_file(file)):
            continue
        elif not precious_file(file):
            if os.path.isfile(fullpath):
                os.remove(fullpath)
                logging.info('deleting file %s', file)
            elif os.path.isdir(fullpath):
                shutil.rmtree(fullpath)
                logging.info('deleting directory %s', file)

if __name__ == "__main__":
    main(sys.argv[1:])