"""Parts-of-speech tagger implementations."""
import nltk
import textblob as tb
from textblob.base import BaseTagger
from textblob.decorators import requires_nltk_corpus
from textblob.en import tag as pattern_tag
[docs]
class PatternTagger(BaseTagger):
"""Tagger that uses the implementation in
Tom de Smedt's pattern library
(http://www.clips.ua.ac.be/pattern).
"""
[docs]
def tag(self, text, tokenize=True):
"""Tag a string or BaseBlob."""
if not isinstance(text, str):
text = text.raw
return pattern_tag(text, tokenize)
[docs]
class NLTKTagger(BaseTagger):
"""Tagger that uses NLTK's standard TreeBank tagger.
NOTE: Requires numpy. Not yet supported with PyPy.
"""
[docs]
@requires_nltk_corpus
def tag(self, text):
"""Tag a string or BaseBlob."""
if isinstance(text, str):
text = tb.TextBlob(text)
return nltk.tag.pos_tag(text.tokens)
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