python备份文件

import os
import time
import sys

def create_backup_dir(dir):
    backup_dir = dir +'/'+time.strftime('%Y%m%d')
    if not os.path.exists(backup_dir):
        os.mkdir(backup_dir)
    return backup_dir

def backup(src,dest):
    if not os.path.exists(src):
        print('src dir not exist')
        sys.exit(1)
    dest = create_backup_dir(dest)
    for file in os.listdir(src):
        srcfile = os.path.join(src, file)
        destfile = os.path.join(dest, file)
        if os.path.isfile(srcfile):
            open(destfile, "wb").write(open(srcfile, "rb").read())

if __name__ == '__main__':
    src = 'D:/data/pcf'
    dest = 'D:/data/pcf/backup'
    backup(src,dest)