https://github.com/zacharyvoase/python-cskipdict
A CFFI-based SkipDict implementation for Python.
https://github.com/zacharyvoase/python-cskipdict
Last synced: 7 months ago
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A CFFI-based SkipDict implementation for Python.
- Host: GitHub
- URL: https://github.com/zacharyvoase/python-cskipdict
- Owner: zacharyvoase
- Created: 2017-04-27T09:09:34.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2017-08-20T07:08:36.000Z (about 8 years ago)
- Last Synced: 2025-03-01T07:05:28.694Z (7 months ago)
- Language: C++
- Homepage:
- Size: 25.4 KB
- Stars: 2
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# cSkipDict
A fast, CFFI-based SkipDict implementation for Python.
`SkipDict` instances are [Skip List][]-based associative arrays ('dictionaries'
in Python terms), mapping 64-bit signed integers to arbitrary Python objects.
Keys are always stored and returned in order, while maintaining average-case
*O(log n)* search, insert and delete times, and average-case space consumption
of *O(n)*.
This libary uses Peter Cannici's public-domain [skiplist.h][] C library,
adapting it slightly for use with Python and CFFI.
[Skip List]: https://en.wikipedia.org/wiki/Skip_list
[skiplist.h]: https://github.com/alpha123/skiplist.h
## Installation
Installation on most systems should be pretty easy:
$ pip install cskipdict
## Usage
You can use it just like a normal `dict`, except that all keys should be
integers between -2^63^ and +2^63^ - 1 inclusive.
>>> from cskipdict import SkipDict
>>> d = SkipDict()
>>> d
SkipDict({})
>>> len(d)
0
>>> d[123] = 'abc'
>>> d
SkipDict({123: 'abc'})
>>> d[420] = 'def'
>>> d
SkipDict({123: 'abc', 420: 'def'})
>>> d[69] = 'foo'
>>> d
SkipDict({69: 'foo', 123: 'abc', 420: 'def'})
Iteration will always happen in ascending order of the keys:
>>> for k, v in d.iteritems():
... print((k, v))
(69, 'foo')
(123, 'abc')
(420, 'def')
## Unlicense
This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
software, either in source code form or as a compiled binary, for any purpose,
commercial or non-commercial, and by any means.
In jurisdictions that recognize copyright laws, the author or authors of this
software dedicate any and all copyright interest in the software to the public
domain. We make this dedication for the benefit of the public at large and to
the detriment of our heirs and successors. We intend this dedication to be an
overt act of relinquishment in perpetuity of all present and future rights to
this software under copyright law.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
For more information, please refer to