Remove all backups for the given project except the last 5

reback.py

import sys
import os
import os.path
import argparse

def_folder=os.getcwd()
def createParser ():
    parser = argparse.ArgumentParser(description='Delete your backups')
    parser.add_argument ('-p', '--proj',default='all',help='Project name')
    parser.add_argument ('-l','--list',action='store_true',help='Print all projects') 
    parser.add_argument ('-f', '--folder',default=def_folder,help='Folder projects')
    return parser
parser = createParser()
if len(sys.argv) == 1:
        print 'nERROR! You must specify at least one option.n'
        parser.print_help()
	exit();

arg=parser.parse_args()
folder=arg.folder
dirs = [d for d in os.listdir(folder) if os.path.isdir(os.path.join(folder, d))]

if arg.list:
    print(dirs)
    exit();
os.chdir(folder)

def rm_from_proj(fold):
    datehash={}
    date=[]
    os.chdir(fold)
    files=os.listdir('.')
    for f in files:
        untime=(os.path.getctime(f))
        datehash[untime]=f
        date.append(os.path.getctime(f))
    date.sort()
    i=len(date)
    i=i-6
    while i >= 0:
		os.remove(datehash[date[i]])
		print(fold,datehash[date[i]],"is deleted")
		i=i-1
    os.chdir(folder)

if arg.proj and arg.proj!='all':
    fold=arg.proj
    rm_from_proj(fold)

if arg.proj=='all':
	for g in dirs:
		rm_from_proj(g)