如何使用Python zipfile为zip文件添加注释？

Question

    $ echo "short"|zip -z test.zip
    enter new zip file comment (end with .):
    $ md5sum test.zip
    48da9079a2c19f9755203e148731dae9  test.zip
    $ echo "longlong"|zip -z test.zip
    current zip file comment is:
    short
    enter new zip file comment (end with .):
    $ md5sum test.zip
    3618846524ae0ce51fbc53e4b32aa35b  test.zip
    $ echo "short"|zip -z test.zip
    current zip file comment is:
    longlong
    enter new zip file comment (end with .):
    root@Debian:~# md5sum test.zip
    48da9079a2c19f9755203e148731dae9  test.zip
    $ echo "longlong"|zip -z test.zip
    current zip file comment is:
    short
    enter new zip file comment (end with .):
    $ md5sum test.zip
    3618846524ae0ce51fbc53e4b32aa35b  test.zip
    $
    $
    $ cat test.py
    #/usr/bin/env python
    #coding: utf-8

    import zipfile
    import subprocess

    zip_name = 'test.zip'

    def add_comment(zip_name, comment):
        with zipfile.ZipFile(zip_name, 'a') as zf:
            zf.comment = comment

    add_comment(zip_name, "short")
    print subprocess.Popen(['md5sum', zip_name], stdout=subprocess.PIPE).communicate()[0],
    add_comment(zip_name, "longlong")
    print subprocess.Popen(['md5sum', zip_name], stdout=subprocess.PIPE).communicate()[0],
    add_comment(zip_name, "short")
    print subprocess.Popen(['md5sum', zip_name], stdout=subprocess.PIPE).communicate()[0],
    add_comment(zip_name, "longlong")
    print subprocess.Popen(['md5sum', zip_name], stdout=subprocess.PIPE).communicate()[0],
    $
    $ python test.py 
    48da9079a2c19f9755203e148731dae9  test.zip
    3618846524ae0ce51fbc53e4b32aa35b  test.zip
    89c2038501f737991ca21aa097ea9956  test.zip
    3618846524ae0ce51fbc53e4b32aa35b  test.zip

在命令行环境中，第一次和第三次对“test.zip”文件计算的md5值是一样的；而第二次和第四次的md5值也是一样的。但是当我用Python的zipfile模块来处理时，结果却不一样。请问我该如何使用Python的zipfile模块来做到这一点呢？

Answer 1

zipfile.ZipFile() 类有一个可以设置的comment 属性。

你可以以追加模式打开文件，修改评论内容，然后在关闭文件时，这些修改会被保存：

from zipfile import ZipFile

with ZipFile('test.zip', 'a') as testzip:
    testzip.comment = 'short'

当你把 ZipFile 当作上下文管理器使用时，就像普通文件一样，当你退出 with 代码块时，它会自动关闭。