Extracting only a specific subfolder 7zip

Question

I'm working on a python script that will automatically update Calibre since it does not contain an autoupdater and updates weekly. My script downloads the portable zip file, and then should extract a specific subfolder of the zip file (I don't need all the files).

What I have so far:

os.system("7z x install.zip -y -r -oc:\\\"Program Files (x86)\\\"Calibre2");

This works for everything except downloading the specific sub directory I need. Any suggestions?

score 3 · Accepted Answer · edited May 23 '17 at 10:34

3

As given in How to partially extract a folder from a 7z file using powershell:

os.system("7z x install.zip subfolder -y -r -oc:\\\"Program Files (x86)\\\"Calibre2")

should be ok for you

edited May 23 '17 at 10:34

Community

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answered Sep 13 '12 at 22:43

Mat M

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score 0 · Answer 2 · edited May 23 '17 at 11:55

0

Below is a zip version of a similar answer I gave for tar files.

Usage:

unzipdir.py path/to/zipfile zip/folder [output/folder]

Script:

import sys, os
from zipfile import ZipFile

def get_members(zip, prefix):
    if not prefix.endswith('/'):
        prefix += '/'
    offset = len(prefix)
    for zipinfo in zip.infolist():
        name = zipinfo.filename
        if len(name) > offset:
            zipinfo.filename = name[offset:]
            yield zipinfo

args = sys.argv[1:]

if len(args):
    zip = ZipFile(args[0])
    path = args[2] if len(args) > 2 else '.'
    zip.extractall(path, get_members(zip, args[1]))

edited May 23 '17 at 11:55

Community

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answered Jan 14 '12 at 21:25

ekhumoro

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@Jacobm001. I tested my script on the [latest calibre version](http://sourceforge.net/projects/calibre/files/), and it works fine (it only took a few seconds to extract the 128Mb `/Calibre Portable/Calibre` folder). So 7zip is not needed. – ekhumoro Jan 15 '12 at 01:51

Extracting only a specific subfolder 7zip

2 Answers2