cskipdict 0.0.4

A fast CFFI-based SkipDict implementation.

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.

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:sup:63 and +2⁶³ - 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 http://unlicense.org/