arlib 0.0.4

Description:

arlib 0.0.4

arlib: Common interface for archive manipulation (Tar, Zip, etc)





Table of Contents

Installation

Install from PyPI
Install from Anaconda


Simple example

Open archive
List member names
Open a member
License


Documentation


Rationale
Sometimes, we need to deal with different archive files. There are
several packages/modules for archive file manipulation, e.g.,
zipfile for "*.zip" files, tarfile for "*.tar.gz" or "*.tar.bz2"
files, etc. If we want to support different archive type in our
project, probably we need to do the following:
if zipfile.is_zipfile(file):
ar = zipfile.ZipFile(file)
f = ar.open('member-name')
# some processing
elif zipfile.is_tarfile(file):
ar = tarfile.open(file)
f = ar.extractfile('member-name')
# some processing
else:
# other stuffs

The problems of the above approach are:

We need repeat the above code everywhere we want to support
different archive types.
Different archive manipulation modules (e.g. zipfile and
tarfile) may have different API convention.

arlib is designed to solve the above problems. It abstracts the
logic of archive manipulations and provides a single high level
interface for users.
Installation
Install from PyPI
pip install arlib

Install from Anaconda
conda install -c liyugong arlib

Simple example
The abstract class arlib.Archive defines the common interface to
handle different archive types, such as tar file, zip file or an
directory. Three concrete classes arlib.TarArchive,
arlib.ZipArchive and arlib.DirArchive implement the interface
correspondingly.
Open archive
The simplest way to open an archive is using arlib.open function
ar = arlib.open('abc.tar.gz', 'r')

This will determine the type of the archive automatically and return a
corresponding object of one of the three engine classes. If we don't
want the automatic engine determination mechanism, we can also
specify the class via argument engine, e.g.
ar = arlib.open('abc.tar.gz', 'r', engine=ZipArchive)

or we can simply construct an object of the engine class
ar = arlib.ZipArchive('abc.tar.gz', 'r')

List member names
The property member_names will return a list of the names of members
contained in the archive, e.g.,
print(ar.member_names)

Check member
Use the method member_is_dir and member_is_file to check whether a
member is a directory or a regular file
ar = arlib.open('abc.tar', 'r')
ar.member_is_dir('member_name')
ar.member_is_file('member_name')

Open a member
Use the method open_member to open a member in the archive as a file
object
with ar.open_member('a.txt', 'r') as f:
# do sth by using f as an opened file object

Extract members to a location
Use the method extract to extract members to a specified location
ar = arlib.open('abc.tar', 'r')
ar.extract() # extract all the members to the current working directory
ar.extract(path='d:/hello', members=['abc.txt', 'dir1/'])

License
The arlib package is released under the MIT License
Documentation
https://arlib.readthedocs.io