Compressed integer sets based on Roaring bitmaps.
Roaring bitmaps are fast, compressed, and portable bitmaps, used to store unique sorted integer sets. These bitmaps offer better real-world space complexity and performance than typical hash sets (such as Python’s built-in set), and can be serialized into a portable format for storage and interop with the C/C++, Java and Go libraries.
This library makes the CRoaring implementation available in Python 2.7 and 3.5+. It uses CFFI, so it works on both CPython and PyPy. The full Python set interface is implemented. Comprehensive tests are included.
pip install croaring
The CRoaring source is included with the Python library, so you don’t need to install it from elsewhere (though you may need a C compiler available if a binary package is unavailable for your architecture).
Instantiate a croaring.RoaringBitmap(), and use it just like a normal set:
>>> import croaring >>> bitmap = croaring.RoaringBitmap() >>> bitmap RoaringBitmap() >>> bitmap.add(1) >>> bitmap.add(4572) >>> bitmap.add(326) >>> bitmap RoaringBitmap([1, 326, 4572])
You can use either binary operators (|, &, ^ and -) or their English names (union, intersection, symmetric_difference and difference):
>>> bitmap | RoaringBitmap([50, 95]) RoaringBitmap([1, 50, 95, 326, 4572]) >>> bitmap & RoaringBitmap([200, 326]) RoaringBitmap() >>> bitmap ^ RoaringBitmap([200, 326]) RoaringBitmap([1, 200, 4572])
Since the bitmaps are ordered, indexing (including negative) is supported:
>>> bitmap 326 >>> bitmap[-1] 4572
Finally, you can construct a bitmap from a range, similar to the arguments to Python’s built-in range:
>>> RoaringBitmap.range(10) RoaringBitmap([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]) >>> RoaringBitmap.range(2, 10) RoaringBitmap([2, 3, 4, 5, 6, 7, 8, 9]) >>> RoaringBitmap.range(2, 10, 3) RoaringBitmap([2, 5, 8])
CRoaring is licensed under the Apache License v2.0:
Copyright 2016 The CRoaring authors
Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License athttp://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
All other code is released under the 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/
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