This is a pre-production deployment of Warehouse. Changes made here affect the production instance of PyPI (pypi.python.org).
Help us improve Python packaging - Donate today!

A Python extension module that wraps Google's diff_match_patch C++ implementation for very fast string comparisons.

Project Description

A Python extension module that wraps google-diff-match-patch’s C++ implementation for performing very fast string comparisons.

google-diff-match-patch is a Google library for computing differences between text files (<http://code.google.com/p/google-diff-match-patch>). Thare are implementations in various languages. Although there is a Python port, it’s slow on very large documents, and I have a need for speed. I wanted to use the C++ implementation, but I’m a Python guy so I’d prefer to use it from Python.

@leutloff determined that the C++ port could be even faster by replacing the Qt 4 dependency with the standard C++ library primitives. So he rewrote the module at <https://github.com/leutloff/diff-match-patch-cpp-stl>.

This project is an extension module for Python using @leutloff’s library so Python code can call into the native library easily. It works in both Python 2 and Python 3.

Example

First:

pip3 install diff_match_patch_python

Then write (this is Python 3):

from diff_match_patch import diff

changes = diff("Hello world.", "Goodbye moon.",
        timelimit=0, checklines=False)

for op, length in changes:
        if op == "-": print ("next", length, "characters are deleted")
        if op == "=": print ("next", length, "characters are in common")
        if op == "+": print ("next", length, "characters are inserted")

The module also provides a method called diff_bytes for performing a diff on a bytes array.

In Python 2, the methods are named diff_unicode (unicode strings) and diff_str (str strings).

The timelimit argument is the maximum running time in seconds if you want to ensure the result comes quickly. According to the Google docs, the diff will stop working after the time is exceeded and will return a valid diff, but it might not be the best one. checklines is also a Google thing and might speed up diffs that are over lined-based text like code.

The diff methods also take a counts_only argument which is True by default. Set it to False to have the returned value be an array of tuples of operations and corresponding strings rather than operations and the lengths of those strings.

Dependencies

To build from source, you will need:

  • Python development headers (Debian package python-dev)
  • The diff-match-patch library, which you can clone using git submodule update --init.

Build

Build the binary module using:

python setup.py install

Or you may find pre-built binaries stored in the git repository in the build directory. Your mileage may vary with these depending on whether your system is compatible.

Release History

Release History

This version
History Node

1.0.1

Download Files

Download Files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
diff_match_patch_python_python2_fork-1.0.1.tar.gz (29.7 kB) Copy SHA256 Checksum SHA256 Source Feb 12, 2016

Supported By

WebFaction WebFaction Technical Writing Elastic Elastic Search Pingdom Pingdom Monitoring Dyn Dyn DNS Sentry Sentry Error Logging CloudAMQP CloudAMQP RabbitMQ Heroku Heroku PaaS Kabu Creative Kabu Creative UX & Design Fastly Fastly CDN DigiCert DigiCert EV Certificate Rackspace Rackspace Cloud Servers DreamHost DreamHost Log Hosting