sentence segmentation and word tokenization tools
The segtok package provides two modules, segtok.segmenter and segtok.tokenizer. The segmenter provides functionality for splitting (Indo-European) text into sentences. The tokenizer provides functionality for splitting (Indo-European) sentences into words and symbols (collectively called tokens). Both modules can also be used from the command-line. While other Indo-European languages could work, it has only been designed with languages such as Spanish, English, and German in mind. For a more informed introduction to this tool, please read the article on my blog.
To use this package, you minimally should have the latest version of Python 2.7 or any 3.3+ branch installed. The package is expected to work with both Python 2.7 and 3.3+, tested against those latest Python branches, as well as Python 3.3. The easiest way to get segtok installed is using pip or any other package manager that works with PyPI:
pip3 install segtok
Important: If you are on a Linux machine and have problems installing the regex dependency of segtok, make sure you have the python-dev and/or python3-dev packages installed to get the necessary headers to compile the package.
Then try the command line tools on some plain-text files (e.g., this README) to see if segtok meets your needs:
segmenter README.rst | tokenizer
The testing environment works with pytest, tox and pyenv. You first need to install pyenv (on OSX with Homebrew: brew install pyenv), and tox with pytest (pip3 install tox pytest). Configuring pyenv depends on the Python versions you have installed. Here, we assume you have the latest 2.7 and 3 versions installed and only need to provide an environment for testing segtok against the 3.3 branch:
pyenv install 3.3.6 pyenv global system 3.3.6
The second command is essential and indicates that your preferred Python binary is the system version and then the 3.3.6 branch. If you forget the second command, you will see errors like ERROR: InvocationError: Failed to get version_info for python3.3: pyenv: python3.3: command not found when running tox. If you only have one Python version installed (say, 2.7), to fully run the tests, you must also install and globally configure the other version (e.g., the latest 3.x) with pyenv, too.
Finally, to run all of segtok’s unit-test suite, just run tox:
For details, please refer to the respective documentation; This README only provides an overview of the provided functionality.
After installing the package, two command-line tools will be available, segmenter and tokenizer. Each can take UTF-8 encoded plain-text and transforms it into newline-separated sentences or tokens, respectively. You can use other encoding in Python3 simply by reconfiguring your environment encoding or in any version of Python by forcing a particular encoding with the --encoding parameters. The tokenizer assumes that each line contains (at most) one single sentence, which is the output format of the segmenter. To learn more about each tool, please invoke them with their help option (-h or --help).
This module provides several split_... functions to segment texts into lists of sentences. In addition, to_unix_linebreaks normalizes linebreaks (including the Unicode linebreak) to newline control characters (\\n). The function rewrite_line_separators can be used to move (rewrite) the newline separators in the input text so that they are placed at the sentence segmentation locations.
This module provides several ..._tokenizer functions to tokenize input sentences into words and symbols. To get the full functionality, use the web_tokenizer, which will split everything “semantically correctly” except for URLs and e-mail addresses. In addition, it provides convenience functionality for English texts: Two compiled patterns (IS_...) can be used to detect if a word token contains a possessive-s marker (“Frank’s”) or is an apostrophe-based contraction (“didn’t”). Tokens that match these patterns can then be split using the split_possessive_markers and split_contractions functions, respectively.
Copyright (c) 2014-2017, Florian Leitner. All rights reserved.