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

Project description


Static memory-efficient Trie-like structures for Python (2.x and 3.x) 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.


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


pip install marisa-trie

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.


Wrapper code is licensed under MIT License.

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


0.7.4 (2017-03-27)

  • Fixed packaging issue, 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 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)

  • 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);
  • 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)

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.

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