marisa-trie-m 0.7.6

Static memory-efficient and fast Trie-like structures for Python.

marisa-trie

A fork of maris-trie that support Python 3.9.

Static memory-efficient Trie-like structures for Python (2.7 and 3.4+) based on marisa-trie C++ library.

String data in a MARISA-trie may take up to 50x-100x less memory than in a standard Python dict; the raw lookup speed is comparable; trie also provides fast advanced methods like prefix search.

Note

There are official SWIG-based Python bindings included in C++ library distribution; this package provides alternative Cython-based pip-installable Python bindings.

Installation

pip install marisa-trie-m

Current limitations

• The library is not tested with mingw32 compiler;

• .prefixes() method of BytesTrie and RecordTrie is quite slow and doesn’t have iterator counterpart;

• read() and write() methods don’t work with file-like objects (they work only with real files; pickling works fine for file-like objects);

• there are keys() and items() methods but no values() method.

License

Wrapper code is licensed under MIT License.

Bundled marisa-trie C++ library is dual-licensed under LGPL and BSD 2-clause license.

CHANGES

0.7.5 (2018-04-10)

• Removed redundant DeprecationWarning messages in Trie.save and Trie.load.

• Dropped support for Python 2.6.

• Rebuild Cython wrapper with Cython 0.28.1.

0.7.4 (2017-03-27)

• Fixed packaging issue, MANIFEST.in was not updated after libmarisa-trie became a submodule.

0.7.3 (2017-02-14)

• Added BinaryTrie for storing arbitrary sequences of bytes, e.g. IP addresses (thanks Tomasz Melcer);

• Deprecated Trie.has_keys_with_prefix which can be trivially implemented in terms of Trie.iterkeys;

• Deprecated Trie.read and Trie.write which onlywork for “real” files and duplicate the functionality of load and save. See issue #31 on GitHub;

• Updated libmarisa-trie to the latest version. Yay, 64-bit Windows support.

• Rebuilt Cython wrapper with Cython 0.25.2.

0.7.2 (2015-04-21)

• packaging issue is fixed.

0.7.1 (2015-04-21)

• setup.py is switched to setuptools;

• a tiny speedup;

• wrapper is rebuilt with Cython 0.22.

0.7 (2014-12-15)

• trie1 == trie2 and trie1 != trie2 now work (thanks Sergei Lebedev);

• for key in trie: is fixed (thanks Sergei Lebedev);

• wrapper is rebuilt with Cython 0.21.1 (thanks Sergei Lebedev);

• https://bitbucket.org/kmike/marisa-trie repo is no longer supported.

0.6 (2014-02-22)

• New Trie methods: __getitem__, get, items, iteritems. trie[u'key'] is now the same as trie.key_id(u'key').

• small optimization for BytesTrie.get.

• wrapper is rebuilt with Cython 0.20.1.

0.5.3 (2014-02-08)

• small Trie.restore_key optimization (it should work 5-15% faster)

0.5.2 (2014-02-08)

• fix Trie.restore_key method - it was reading past declared string length;

• rebuild wrapper with Cython 0.20.

0.5.1 (2013-10-03)

• has_keys_with_prefix(prefix) method (thanks Matt Hickford)

0.5 (2013-05-07)

• BytesTrie.iterkeys, BytesTrie.iteritems, RecordTrie.iterkeys and RecordTrie.iteritems methods;

• wrapper is rebuilt with Cython 0.19;

• value_separator parameter for BytesTrie and RecordTrie.

0.4 (2013-02-28)

• improved trie building: weights optional parameter;

• improved trie building: unnecessary input sorting is removed;

• wrapper is rebuilt with Cython 0.18;

• bundled marisa-trie C++ library is updated to svn r133.

0.3.8 (2013-01-03)

• Rebuild wrapper with Cython pre-0.18;

• update benchmarks.

0.3.7 (2012-09-21)

• Update bundled marisa-trie C++ library (this may fix more mingw issues);

• Python 3.3 support is back.

0.3.6 (2012-09-05)

• much faster (3x-7x) .items() and .keys() methods for all tries; faster (up to 3x) .prefixes() method for Trie.

0.3.5 (2012-08-30)

• Pickling of RecordTrie is fixed (thanks lazarou for the report);

• error messages should become more useful.

0.3.4 (2012-08-29)

• Issues with mingw32 should be resolved (thanks Susumu Yata).

0.3.3 (2012-08-27)

• .get(key, default=None) method for BytesTrie and RecordTrie;

• small README improvements.

0.3.2 (2012-08-26)

• Small code cleanup;

• load, read and mmap methods returns ‘self’;

• I can’t run tests (via tox) under Python 3.3 so it is removed from supported versions for now.

0.3.1 (2012-08-23)

• .prefixes() support for RecordTrie and BytesTrie.

0.3 (2012-08-23)

• RecordTrie and BytesTrie are introduced;

• IntTrie class is removed (probably temporary?);

• dumps/loads methods are renamed to tobytes/frombytes;

• benchmark & tests improvements;

• support for MARISA-trie config options is added.

0.2 (2012-08-19)

• Pickling/unpickling support;

• dumps/loads methods;

• python 3.3 workaround;

• improved tests;

• benchmarks.

0.1 (2012-08-17)

Initial release.