Python学习笔记组织文件之将一个文件夹备份到一个zip文件

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　　假定你正在做一个项目，它的文件保存在C:\AlsPythonBook 文件夹中。你担心工作会丢失，所以希望为整个文件夹创建一个ZIP 文件，作为“快照”。你希望保存

不同的版本，希望 ZIP 文件的文件名每次创建时都有所变化。例如 AlsPythonBook_1.zip、AlsPythonBook_2.zip、AlsPythonBook_3.zip，等等。你可以手工完成，

但这有点烦人，而且可能不小心弄错ZIP 文件的编号。运行一个程序来完成这个烦人的任务会简单得多。

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　　示例代码：

#! python 3
# -*- coding:utf-8 -*-
# Autor: Li Rong Yang
#a ZIP file whose filename increments
import zipfile, os
 
def backupToZip(folder):
    # Backup the entire contents of "folder" into a zip file.
 
    folder = os.path.abspath(folder) # make sure folder is absolute
 
    # Figure out the filename this code should used based on
    # what files already exist.
    number = 1
    while True:
        zipFilename = os.path.basename(folder) + '_' + str(number) + '.zip'
        if not os.path.exists(zipFilename):
            break
        number = number + 1
 
    # Create the zip file.
    print('Creating %s...' % (zipFilename))
    backupZip = zipfile.ZipFile(zipFilename, 'w')
 
    # Walk the entire folder tree and compress the files in each folder.
    for foldername, subfolders, filenames in os.walk(folder):
        print('Adding files in %s...' % (foldername))
        # Add the current folder to the ZIP file.
        backupZip.write(foldername)
 
        # Add all the files in this folder to the ZIP file.
        for filename in filenames:
            if filename.startswith(os.path.basename(folder) + '_') and filename.endswith('.zip'):
                continue # don't backup the backup ZIP files
            backupZip.write(os.path.join(foldername, filename))
    backupZip.close()
    print('Done.')
 
backupToZip('d:\\quiz')