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Python

# Natural Language Toolkit: Stemmer Interface
#
# Copyright (C) 2001-2019 NLTK Project
# Author: Trevor Cohn <tacohn@cs.mu.oz.au>
# Edward Loper <edloper@gmail.com>
# Steven Bird <stevenbird1@gmail.com>
# URL: <http://nltk.org/>
# For license information, see LICENSE.TXT
from abc import ABCMeta, abstractmethod
from six import add_metaclass
@add_metaclass(ABCMeta)
class StemmerI(object):
"""
A processing interface for removing morphological affixes from
words. This process is known as stemming.
"""
@abstractmethod
def stem(self, token):
"""
Strip affixes from the token and return the stem.
:param token: The token that should be stemmed.
:type token: str
"""