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file open from nested zip file archive.

Project description

zip_open open file from nested zip file archive.

If you use static file like as ‘data.zip’ and open this from your python code, Your program will become like open(os.path.join(os.path.dirname(__file__), 'data.zip')). But if your packages are packed into packages.zip file (zipped-egg, or cases to gather in one file on Google App Engine matter), your code doesn’t work fine.

In this situation, the file path of data.zip becomes /path/to/packages.zip/data.zip, then your program can’t open the data.zip file.

zip_open package solves this problem.

Features

  • Open file from nested zip archive file path/name.
  • Open file from nested zip archive file-like-object.

Using sample1: open the file from zip file

packages1.zip is:

packages1.zip
  + file1.txt

Open file1.txt:

>>> from zip_open import zopen
>>> fobj = zopen('packages1.zip/file1.txt')
>>> data = fobj.read()
>>> print(data)
I am file1.txt, ok.

You can specifiy zopen subpath args:

>>> fobj = zopen('packages1.zip', 'file1.txt')
>>> print(fobj.read())
I am file1.txt, ok.

These code samples equivalent to below code:

>>> from zipfile import ZipFile
>>> zipobj = ZipFile('packages1.zip')
>>> data = zipobj.read('file1.txt')
>>> print(data)
I am file1.txt, ok.

Using sample2: open the file from nested zip file

packages2.zip is:

packages2.zip
  + data2.zip
     + file2.txt

Open file2.txt:

>>> from zip_open import zopen
>>> fobj = zopen('packages2.zip/data2.zip/file2.txt')
>>> print(fobj.read())
I am file2.txt, ok.

If you want to open from file-like-object, you can call:

>>> zip_fileobj = open('packages2.zip', 'rb')
>>> fobj = zopen(zip_fileobj, 'data2.zip/file2.txt')
>>> print(fobj.read())
I am file2.txt, ok.

then you also call:

>>> from StringIO import StringIO
>>> zip_payload = open('packages2.zip', 'rb').read()
>>> zip_fileobj = StringIO(zip_payload)
>>> fobj = zopen(zip_fileobj, 'data2.zip/file2.txt')
>>> print(fobj.read())
I am file2.txt, ok.

Using sample3: open the file included in package oneself

packages3.zip is:

packages3.zip
  + foo.py
  + file1.txt
  + data3.zip
     + file3.txt

foo.py:

import os
from zip_open import zopen

def loader(filename):
    fobj = zopen(os.path.join(os.path.dirname(__file__), filename))
    return fobj

execute loader() from interactive shell:

>>> import sys
>>> sys.path.insert(0, 'packages3.zip')
>>> import foo
>>> fobj = foo.loader('file1.txt')
>>> print(fobj.read())
I am file1.txt, ok.
>>> fobj = foo.loader('data3.zip/file3.txt')
>>> print(fobj.read())
I am file3.txt, ok.

Requirements and dependencies

  • Requirement: Python 2.4 or later
  • Dependency: Nothing.

ToDo

  • Add tar.gz file support.
  • Add using sample document for egg archive.
  • Support Python3
  • Add module import feature.

History

0.2.1 (Unreleased)

  • fixed: test broken (open file as binary)
  • use distutils.core.setup if no setuptools.

0.2.0 (2011-11-29)

  • Change license from PSL to Apache License 2.0
  • Add feature: open from file-like-object.

0.1.0 (2010-7-19)

  • first release

Project details


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