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venv/lib/python3.7/site-packages/nltk/stem/api.py

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+# 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
+        """