loongson/pypi/: cdifflib-1.2.9 metadata and description

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C implementation of parts of difflib

author Matthew Duggan
author_email Matthew Duggan <mgithub@guarana.org>
classifiers
  • Development Status :: 5 - Production/Stable
  • Environment :: Console
  • Intended Audience :: Developers
  • License :: OSI Approved :: BSD License
  • Operating System :: MacOS :: MacOS X
  • Operating System :: Microsoft :: Windows
  • Operating System :: POSIX
  • Programming Language :: Python
  • Topic :: Software Development
  • Topic :: Text Processing :: General
description_content_type text/markdown
keywords difflib,c,diff
license Copyright (c) 2013, Matthew Duggan All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the {organization} nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
project_urls
  • Homepage, https://github.com/mduggan/cdifflib
  • Bug Tracker, https://github.com/mduggan/cdifflib/issues
requires_python >=3.4
File Tox results History
cdifflib-1.2.9-cp310-cp310-manylinux_2_28_loongarch64.whl
Size
37 KB
Type
Python Wheel
Python
3.10
  • Replaced 1 time(s)
  • Uploaded to loongson/pypi by loongson 2026-07-02 01:09:19

cdifflib

Python difflib sequence matcher reimplemented in C.

Actually only contains reimplemented parts. Creates a CSequenceMatcher type which inherets most functions from difflib.SequenceMatcher.

cdifflib is about 4x the speed of the pure python difflib when diffing large streams.

Limitations

The C part of the code can only work on list rather than generic iterables, so anything that isn't a list will be converted to list in the CSequenceMatcher constructor. This may cause undesirable behavior if you're not expecting it.

Works with Python 2.7 and 3.6 (Should work on all 3.3+)

Usage

Can be used just like the difflib.SequenceMatcher as long as you pass lists. These examples are right out of the difflib docs:

>>> from cdifflib import CSequenceMatcher
>>> s = CSequenceMatcher(None, ' abcd', 'abcd abcd')
>>> s.find_longest_match(0, 5, 0, 9)
Match(a=1, b=0, size=4)
>>> s = CSequenceMatcher(lambda x: x == " ",
...                      "private Thread currentThread;",
...                      "private volatile Thread currentThread;")
>>> print round(s.ratio(), 3)
0.866

It's completely compatible, so you can replace the difflib version on startup and then other libraries will use CSequenceMatcher too, eg:

from cdifflib import CSequenceMatcher
import difflib
difflib.SequenceMatcher = CSequenceMatcher
import library_that_uses_difflib

# Now the library will transparantely be using the C SequenceMatcher - other
# things remain the same
library_that_uses_difflib.do_some_diffing()

Making

Set up a venv:

python -m venv .venv
source .venv/bin/activate

To install:

python -m build

To test:

python -m pytest tests/cdifflib_tests.py

License etc

This code lives at https://github.com/mduggan. See LICENSE for the license.

Changelog