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A Python interface to OpenFst
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examples Basic API name changes (version 0.2) Aug 20, 2013
fst Symbol table related improvements Sep 7, 2013
.gitignore Fix path enumeration algorithm Nov 28, 2012 Add Apache license Oct 10, 2013 Symbol table related improvements Sep 7, 2013


Python interface to OpenFst



  1. Install OpenFst 1.3
  2. pip install pyfst (do not try installing directly from the git repository)

Basic Usage

import fst

t = fst.Transducer()

t.add_arc(0, 1, 'a', 'A', 0.5)
t.add_arc(0, 1, 'b', 'B', 1.5)
t.add_arc(1, 2, 'c', 'C', 2.5)

t[2].final = 3.5

t.shortest_path() # 2 -(a:A/0.5)-> 1 -(c:C/2.5)-> 0/3.5 

The pyfst API is IPython notebook-friendly: the transducers objects are automatically drawn using Graphviz.


See the wiki to learn about how to install pyfst from the Cython source.


Copyright 2013 Victor Chahuneau

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 at

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.

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