简明python教程backup_ver1.py案例

import os

import time

source = [' /Users/Tblacker/Documents/Test']

target_dir ='/Users/Tblacker/Documents/Backup'

target = target_dir + os.sep + \

time.strftime('%Y%m%d%H%M%S') +'.zip'

if not os.path.exists(target_dir):

    os.mkdir(target_dir)

zip_command ='zip -qr {0}{1}'.format(target,' '.join(source))

print('Zip command is:')

print(zip_command)

print('Running:')

if os.system(zip_command) ==0:

    print('Successful backup to',target)

else:

    print('Backup FAILED')

以上是按照简明python教程写的代码

因为一个空格问题，出现以下问题：

Zip command is:

zip -qr /Users/Tblacker/Documents/Backup/20170615224248.zip/Users/Tblacker/Documents/Test

Running:

zip error: Nothing to do! (/Users/Tblacker/Documents/Backup/20170615224248.zip/Users/Tblacker/Documents/Test.zip)

Backup FAILED

Process finished with exit code 0

通过在

source = [' /Users/Tblacker/Documents/Test']

的/User前面添加空格

终于成功了，但这是为什么呢？等明白了再补完

原来是

zip_command ='zip -qr {0}{1}'.format(target,' '.join(source))

忘了在{0}{1}中忘了加空格