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Add abstract base class syntax to tokenize/api.py #1223

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merged 2 commits into from
Jan 4, 2016
Merged

Add abstract base class syntax to tokenize/api.py #1223

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b40ebee
Add abstract base class syntax to tokenize/api.py
Dec 8, 2015
86efe6a
Replace python2 syntax with six.add_metaclass decorator in tokenize/a…
Dec 8, 2015
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7 changes: 5 additions & 2 deletions nltk/tokenize/api.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,14 +10,19 @@
Tokenizer Interface
"""

from abc import ABCMeta, abstractmethod
from six import add_metaclass

from nltk.internals import overridden
from nltk.tokenize.util import string_span_tokenize

@add_metaclass(ABCMeta)
class TokenizerI(object):
"""
A processing interface for tokenizing a string.
Subclasses must define ``tokenize()`` or ``tokenize_sents()`` (or both).
"""
@abstractmethod
def tokenize(self, s):
"""
Return a tokenized copy of *s*.
Expand All @@ -26,8 +31,6 @@ def tokenize(self, s):
"""
if overridden(self.tokenize_sents):
return self.tokenize_sents([s])[0]
else:
raise NotImplementedError()

def span_tokenize(self, s):
"""
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