Nltk: 放弃对 Python 2.7 的支持

我明白了，好吧，是时候继续前进了！

从这些__future__ =)

~/git-stuff/my-contrib/nltk$ grep "__future__" nltk/**/*
nltk/app/chartparser_app.py:from __future__ import division
nltk/app/chunkparser_app.py:from __future__ import division
nltk/app/collocations_app.py:from __future__ import division
nltk/app/rdparser_app.py:from __future__ import division
nltk/app/wordnet_app.py:from __future__ import print_function
nltk/ccg/api.py:from __future__ import unicode_literals
nltk/ccg/chart.py:from __future__ import print_function, division, unicode_literals
nltk/ccg/combinator.py:from __future__ import unicode_literals
nltk/ccg/lexicon.py:from __future__ import unicode_literals
nltk/chat/__init__.py:from __future__ import print_function
nltk/chat/eliza.py:from __future__ import print_function
nltk/chat/iesha.py:from __future__ import print_function
nltk/chat/rude.py:from __future__ import print_function
nltk/chat/suntsu.py:from __future__ import print_function
nltk/chat/util.py:from __future__ import print_function
nltk/chat/zen.py:from __future__ import print_function
nltk/chunk/named_entity.py:from __future__ import print_function
nltk/chunk/named_entity.py:from __future__ import unicode_literals
nltk/chunk/regexp.py:from __future__ import print_function, unicode_literals
nltk/chunk/regexp.py:from __future__ import division
nltk/chunk/util.py:from __future__ import print_function, unicode_literals, division
nltk/classify/decisiontree.py:from __future__ import print_function, unicode_literals, division
nltk/classify/maxent.py:from __future__ import print_function, unicode_literals
nltk/classify/megam.py:from __future__ import print_function
nltk/classify/naivebayes.py:from __future__ import print_function, unicode_literals
nltk/classify/rte_classify.py:from __future__ import print_function
nltk/classify/scikitlearn.py:from __future__ import print_function, unicode_literals
nltk/classify/senna.py:    >>> from __future__ import unicode_literals
nltk/classify/senna.py:from __future__ import unicode_literals
nltk/classify/tadm.py:from __future__ import print_function, unicode_literals
nltk/classify/textcat.py:from __future__ import print_function, unicode_literals
nltk/classify/util.py:from __future__ import print_function, division
nltk/classify/weka.py:from __future__ import print_function
nltk/cluster/em.py:from __future__ import print_function, unicode_literals
nltk/cluster/gaac.py:from __future__ import print_function, unicode_literals, division
nltk/cluster/kmeans.py:from __future__ import print_function, unicode_literals, division
nltk/cluster/util.py:from __future__ import print_function, unicode_literals, division
grep: nltk/corpus/reader: Is a directory
nltk/corpus/util.py:from __future__ import unicode_literals
nltk/draw/table.py:from __future__ import division
nltk/inference/api.py:from __future__ import print_function
nltk/inference/discourse.py:from __future__ import print_function
nltk/inference/mace.py:from __future__ import print_function
nltk/inference/nonmonotonic.py:from __future__ import print_function, unicode_literals
nltk/inference/prover9.py:from __future__ import print_function
nltk/inference/resolution.py:from __future__ import print_function, unicode_literals
nltk/inference/tableau.py:from __future__ import print_function, unicode_literals
nltk/lm/api.py:from __future__ import division, unicode_literals
nltk/lm/counter.py:from __future__ import unicode_literals
nltk/lm/models.py:from __future__ import division, unicode_literals
nltk/lm/vocabulary.py:from __future__ import unicode_literals
nltk/metrics/agreement.py:from __future__ import print_function, unicode_literals, division
nltk/metrics/aline.py:from __future__ import unicode_literals
nltk/metrics/association.py:from __future__ import division
nltk/metrics/confusionmatrix.py:from __future__ import print_function, unicode_literals
nltk/metrics/distance.py:from __future__ import print_function
nltk/metrics/distance.py:from __future__ import division
nltk/metrics/scores.py:from __future__ import print_function, division
nltk/metrics/spearman.py:from __future__ import division
nltk/misc/babelfish.py:from __future__ import print_function
nltk/misc/chomsky.py:from __future__ import print_function
nltk/misc/sort.py:from __future__ import print_function, division
nltk/misc/wordfinder.py:from __future__ import print_function
nltk/parse/bllip.py:from __future__ import print_function
nltk/parse/chart.py:from __future__ import print_function, division, unicode_literals
nltk/parse/corenlp.py:from __future__ import unicode_literals
nltk/parse/dependencygraph.py:from __future__ import print_function, unicode_literals
nltk/parse/earleychart.py:from __future__ import print_function, division
nltk/parse/evaluate.py:from __future__ import division
nltk/parse/featurechart.py:from __future__ import print_function, unicode_literals
nltk/parse/generate.py:from __future__ import print_function
nltk/parse/malt.py:from __future__ import print_function, unicode_literals
nltk/parse/nonprojectivedependencyparser.py:from __future__ import print_function
nltk/parse/pchart.py:from __future__ import print_function, unicode_literals
nltk/parse/projectivedependencyparser.py:from __future__ import print_function, unicode_literals
nltk/parse/recursivedescent.py:from __future__ import print_function, unicode_literals
nltk/parse/shiftreduce.py:from __future__ import print_function, unicode_literals
nltk/parse/stanford.py:from __future__ import unicode_literals
nltk/parse/transitionparser.py:from __future__ import absolute_import
nltk/parse/transitionparser.py:from __future__ import division
nltk/parse/transitionparser.py:from __future__ import print_function
nltk/parse/util.py:from __future__ import print_function
nltk/parse/viterbi.py:from __future__ import print_function, unicode_literals
nltk/sem/boxer.py:from __future__ import print_function, unicode_literals
nltk/sem/chat80.py:from __future__ import print_function, unicode_literals
nltk/sem/cooper_storage.py:from __future__ import print_function
nltk/sem/drt.py:from __future__ import print_function, unicode_literals
nltk/sem/evaluate.py:from __future__ import print_function, unicode_literals
nltk/sem/glue.py:from __future__ import print_function, division, unicode_literals
nltk/sem/hole.py:from __future__ import print_function, unicode_literals
nltk/sem/lfg.py:from __future__ import print_function, division, unicode_literals
nltk/sem/linearlogic.py:from __future__ import print_function, unicode_literals
nltk/sem/logic.py:from __future__ import print_function, unicode_literals
nltk/sem/relextract.py:from __future__ import print_function
nltk/sem/util.py:from __future__ import print_function, unicode_literals
nltk/sentiment/sentiment_analyzer.py:from __future__ import print_function
nltk/sentiment/util.py:from __future__ import division
nltk/stem/arlstem.py:from __future__ import unicode_literals
nltk/stem/cistem.py:from __future__ import unicode_literals
nltk/stem/isri.py:from __future__ import unicode_literals
nltk/stem/lancaster.py:from __future__ import unicode_literals
nltk/stem/porter.py:from __future__ import print_function, unicode_literals
nltk/stem/regexp.py:from __future__ import unicode_literals
nltk/stem/rslp.py:from __future__ import print_function, unicode_literals
nltk/stem/snowball.py:from __future__ import unicode_literals, print_function
nltk/stem/wordnet.py:from __future__ import unicode_literals
nltk/tag/__init__.py:from __future__ import print_function
nltk/tag/brill.py:from __future__ import print_function, division
nltk/tag/brill_trainer.py:from __future__ import print_function, division
nltk/tag/crf.py:from __future__ import absolute_import
nltk/tag/crf.py:from __future__ import unicode_literals
nltk/tag/hmm.py:from __future__ import print_function, unicode_literals, division
nltk/tag/mapping.py:from __future__ import print_function, unicode_literals, division
nltk/tag/perceptron.py:from __future__ import absolute_import
nltk/tag/perceptron.py:from __future__ import print_function, division
nltk/tag/sequential.py:from __future__ import print_function, unicode_literals
nltk/tag/tnt.py:from __future__ import print_function, division
nltk/tbl/demo.py:from __future__ import print_function, absolute_import, division
nltk/tbl/erroranalysis.py:from __future__ import print_function
nltk/tbl/feature.py:from __future__ import division, print_function, unicode_literals
nltk/tbl/rule.py:from __future__ import print_function
nltk/tbl/template.py:from __future__ import print_function
nltk/test/childes_fixt.py:from __future__ import absolute_import
nltk/test/classify_fixt.py:from __future__ import absolute_import
nltk/test/compat_fixt.py:from __future__ import absolute_import
nltk/test/corpus_fixt.py:from __future__ import absolute_import
nltk/test/data.doctest:    >>> from __future__ import print_function
nltk/test/discourse_fixt.py:from __future__ import absolute_import
nltk/test/doctest_nose_plugin.py:from __future__ import print_function
nltk/test/featgram.doctest:    >>> from __future__ import print_function
nltk/test/featstruct.doctest:    >>> from __future__ import print_function
nltk/test/gensim_fixt.py:from __future__ import absolute_import
nltk/test/gluesemantics_malt_fixt.py:from __future__ import absolute_import
grep: nltk/test/images: Is a directory
nltk/test/inference_fixt.py:from __future__ import absolute_import
nltk/test/metrics.doctest:   >>> from __future__ import print_function
nltk/test/nonmonotonic_fixt.py:from __future__ import absolute_import
nltk/test/portuguese_en_fixt.py:from __future__ import absolute_import
nltk/test/probability_fixt.py:from __future__ import absolute_import
nltk/test/runtests.py:from __future__ import absolute_import, print_function
nltk/test/segmentation_fixt.py:from __future__ import absolute_import
nltk/test/semantics_fixt.py:from __future__ import absolute_import
nltk/test/simple.doctest:    >>> from __future__ import print_function
nltk/test/stem.doctest:    >>> from __future__ import print_function
nltk/test/tokenize.doctest:    >>> from __future__ import print_function
nltk/test/translate_fixt.py:from __future__ import absolute_import
grep: nltk/test/unit: Is a directory
nltk/test/util.doctest:    >>> from __future__ import print_function
nltk/test/wordnet.doctest:    >>> from __future__ import print_function, unicode_literals
nltk/test/wordnet_fixt.py:from __future__ import absolute_import
nltk/tokenize/casual.py:from __future__ import unicode_literals
nltk/tokenize/nist.py:from __future__ import unicode_literals
nltk/tokenize/punkt.py:from __future__ import print_function, unicode_literals, division
nltk/tokenize/regexp.py:from __future__ import unicode_literals
nltk/tokenize/repp.py:from __future__ import unicode_literals, print_function
nltk/tokenize/simple.py:from __future__ import unicode_literals
nltk/tokenize/sonority_sequencing.py:from __future__ import unicode_literals
nltk/tokenize/stanford.py:from __future__ import unicode_literals, print_function
nltk/tokenize/stanford_segmenter.py:from __future__ import unicode_literals, print_function
nltk/translate/api.py:from __future__ import print_function, unicode_literals
nltk/translate/bleu_score.py:from __future__ import division
nltk/translate/chrf_score.py:from __future__ import division
nltk/translate/gale_church.py:from __future__ import division
nltk/translate/gleu_score.py:from __future__ import division
nltk/translate/ibm1.py:from __future__ import division
nltk/translate/ibm2.py:from __future__ import division
nltk/translate/ibm3.py:from __future__ import division
nltk/translate/ibm4.py:from __future__ import division
nltk/translate/ibm5.py:from __future__ import division
nltk/translate/ibm_model.py:from __future__ import division
nltk/translate/metrics.py:from __future__ import division
nltk/translate/nist_score.py:from __future__ import division
nltk/translate/ribes_score.py:from __future__ import division
nltk/twitter/common.py:from __future__ import print_function
nltk/twitter/twitter_demo.py:from __future__ import print_function
nltk/twitter/util.py:from __future__ import print_function

然后是兼容代码：

~/git-stuff/my-contrib/nltk$ grep "compat" nltk/**/*
nltk/app/chartparser_app.py:        if not self._checkcompat():
nltk/app/chartparser_app.py:        if not self._checkcompat():
nltk/app/chartparser_app.py:        if not self._checkcompat():
nltk/app/chartparser_app.py:    def _checkcompat(self):
nltk/app/concordance_app.py:import nltk.compat
nltk/app/wordnet_app.py:from nltk import compat
nltk/app/wordnet_app.py:if compat.PY3:
nltk/ccg/api.py:from nltk.compat import python_2_unicode_compatible, unicode_repr
nltk/ccg/api.py:<strong i="6">@python_2_unicode_compatible</strong>
nltk/ccg/api.py:<strong i="7">@python_2_unicode_compatible</strong>
nltk/ccg/api.py:<strong i="8">@python_2_unicode_compatible</strong>
nltk/ccg/api.py:<strong i="9">@python_2_unicode_compatible</strong>
nltk/ccg/chart.py:from nltk.compat import python_2_unicode_compatible
nltk/ccg/chart.py:<strong i="10">@python_2_unicode_compatible</strong>
nltk/ccg/chart.py:<strong i="11">@python_2_unicode_compatible</strong>
nltk/ccg/chart.py:<strong i="12">@python_2_unicode_compatible</strong>
nltk/ccg/combinator.py:from nltk.compat import python_2_unicode_compatible
nltk/ccg/combinator.py:<strong i="13">@python_2_unicode_compatible</strong>
nltk/ccg/combinator.py:<strong i="14">@python_2_unicode_compatible</strong>
nltk/ccg/combinator.py:<strong i="15">@python_2_unicode_compatible</strong>
nltk/ccg/combinator.py:<strong i="16">@python_2_unicode_compatible</strong>
nltk/ccg/combinator.py:<strong i="17">@python_2_unicode_compatible</strong>
nltk/ccg/combinator.py:<strong i="18">@python_2_unicode_compatible</strong>
nltk/ccg/lexicon.py:from nltk.compat import python_2_unicode_compatible
nltk/ccg/lexicon.py:<strong i="19">@python_2_unicode_compatible</strong>
nltk/chunk/regexp.py:from nltk.compat import python_2_unicode_compatible, unicode_repr
nltk/chunk/regexp.py:<strong i="20">@python_2_unicode_compatible</strong>
nltk/chunk/regexp.py:<strong i="21">@python_2_unicode_compatible</strong>
nltk/chunk/regexp.py:<strong i="22">@python_2_unicode_compatible</strong>
nltk/chunk/regexp.py:<strong i="23">@python_2_unicode_compatible</strong>
nltk/chunk/regexp.py:<strong i="24">@python_2_unicode_compatible</strong>
nltk/chunk/regexp.py:<strong i="25">@python_2_unicode_compatible</strong>
nltk/chunk/regexp.py:<strong i="26">@python_2_unicode_compatible</strong>
nltk/chunk/regexp.py:<strong i="27">@python_2_unicode_compatible</strong>
nltk/chunk/regexp.py:<strong i="28">@python_2_unicode_compatible</strong>
nltk/chunk/regexp.py:<strong i="29">@python_2_unicode_compatible</strong>
nltk/chunk/regexp.py:<strong i="30">@python_2_unicode_compatible</strong>
nltk/chunk/regexp.py:<strong i="31">@python_2_unicode_compatible</strong>
nltk/chunk/util.py:from nltk.compat import python_2_unicode_compatible
nltk/classify/decisiontree.py:from nltk.compat import python_2_unicode_compatible
nltk/classify/decisiontree.py:<strong i="32">@python_2_unicode_compatible</strong>
nltk/classify/maxent.py:from nltk import compat
nltk/classify/maxent.py:@compat.python_2_unicode_compatible
nltk/classify/megam.py:from nltk import compat
nltk/classify/scikitlearn.py:from nltk import compat
nltk/classify/scikitlearn.py:@compat.python_2_unicode_compatible
nltk/classify/senna.py:from nltk.compat import python_2_unicode_compatible
nltk/classify/senna.py:<strong i="33">@python_2_unicode_compatible</strong>
nltk/classify/textcat.py:from nltk.compat import PY3
nltk/cluster/em.py:from nltk.compat import python_2_unicode_compatible
nltk/cluster/em.py:<strong i="34">@python_2_unicode_compatible</strong>
nltk/cluster/gaac.py:from nltk.compat import python_2_unicode_compatible
nltk/cluster/gaac.py:<strong i="35">@python_2_unicode_compatible</strong>
nltk/cluster/kmeans.py:from nltk.compat import python_2_unicode_compatible
nltk/cluster/kmeans.py:<strong i="36">@python_2_unicode_compatible</strong>
nltk/cluster/util.py:from nltk.compat import python_2_unicode_compatible
nltk/cluster/util.py:<strong i="37">@python_2_unicode_compatible</strong>
grep: nltk/corpus/reader: Is a directory
nltk/corpus/util.py:from nltk.compat import python_2_unicode_compatible
nltk/corpus/util.py:<strong i="38">@python_2_unicode_compatible</strong>
nltk/draw/dispersion.py:    import nltk.compat
nltk/draw/table.py:    a way that's incompatible with the fact that ``Table`` behaves as a
nltk/inference/nonmonotonic.py:from nltk.compat import python_2_unicode_compatible
nltk/inference/nonmonotonic.py:<strong i="39">@python_2_unicode_compatible</strong>
nltk/inference/resolution.py:from nltk.compat import python_2_unicode_compatible
nltk/inference/resolution.py:<strong i="40">@python_2_unicode_compatible</strong>
nltk/inference/resolution.py:<strong i="41">@python_2_unicode_compatible</strong>
nltk/lm/counter.py:from nltk import compat
nltk/lm/counter.py:@compat.python_2_unicode_compatible
nltk/lm/models.py:from nltk import compat
nltk/lm/models.py:@compat.python_2_unicode_compatible
nltk/lm/models.py:@compat.python_2_unicode_compatible
nltk/lm/models.py:@compat.python_2_unicode_compatible
nltk/lm/vocabulary.py:from nltk import compat
nltk/lm/vocabulary.py:@compat.python_2_unicode_compatible
nltk/metrics/agreement.py:from nltk.compat import python_2_unicode_compatible
nltk/metrics/agreement.py:<strong i="42">@python_2_unicode_compatible</strong>
nltk/metrics/confusionmatrix.py:from nltk.compat import python_2_unicode_compatible
nltk/metrics/confusionmatrix.py:<strong i="43">@python_2_unicode_compatible</strong>
nltk/parse/chart.py:from nltk.compat import python_2_unicode_compatible, unicode_repr
nltk/parse/chart.py:<strong i="44">@python_2_unicode_compatible</strong>
nltk/parse/chart.py:<strong i="45">@python_2_unicode_compatible</strong>
nltk/parse/chart.py:<strong i="46">@python_2_unicode_compatible</strong>
nltk/parse/corenlp.py:                response = requests.get(requests.compat.urljoin(self.url, 'live'))
nltk/parse/corenlp.py:                response = requests.get(requests.compat.urljoin(self.url, 'ready'))
nltk/parse/dependencygraph.py:from nltk.compat import python_2_unicode_compatible
nltk/parse/dependencygraph.py:<strong i="47">@python_2_unicode_compatible</strong>
nltk/parse/featurechart.py:from nltk.compat import python_2_unicode_compatible
nltk/parse/featurechart.py:<strong i="48">@python_2_unicode_compatible</strong>
nltk/parse/pchart.py:from nltk.compat import python_2_unicode_compatible
nltk/parse/pchart.py:<strong i="49">@python_2_unicode_compatible</strong>
nltk/parse/projectivedependencyparser.py:from nltk.compat import python_2_unicode_compatible
nltk/parse/projectivedependencyparser.py:<strong i="50">@python_2_unicode_compatible</strong>
nltk/parse/projectivedependencyparser.py:<strong i="51">@python_2_unicode_compatible</strong>
nltk/parse/recursivedescent.py:from nltk.compat import unicode_repr
nltk/parse/shiftreduce.py:from nltk.compat import unicode_repr
nltk/parse/stanford.py:        # Windows is incompatible with NamedTemporaryFile() without passing in delete=False.
nltk/parse/viterbi.py:from nltk.compat import python_2_unicode_compatible
nltk/parse/viterbi.py:<strong i="52">@python_2_unicode_compatible</strong>
nltk/sem/boxer.py:from nltk.compat import python_2_unicode_compatible
nltk/sem/boxer.py:<strong i="53">@python_2_unicode_compatible</strong>
nltk/sem/boxer.py:<strong i="54">@python_2_unicode_compatible</strong>
nltk/sem/boxer.py:<strong i="55">@python_2_unicode_compatible</strong>
nltk/sem/chat80.py:from nltk.compat import python_2_unicode_compatible
nltk/sem/chat80.py:<strong i="56">@python_2_unicode_compatible</strong>
nltk/sem/drt.py:from nltk.compat import python_2_unicode_compatible
nltk/sem/drt.py:<strong i="57">@python_2_unicode_compatible</strong>
nltk/sem/drt.py:<strong i="58">@python_2_unicode_compatible</strong>
nltk/sem/drt.py:<strong i="59">@python_2_unicode_compatible</strong>
nltk/sem/drt.py:<strong i="60">@python_2_unicode_compatible</strong>
nltk/sem/evaluate.py:from nltk.compat import python_2_unicode_compatible
nltk/sem/evaluate.py:<strong i="61">@python_2_unicode_compatible</strong>
nltk/sem/evaluate.py:<strong i="62">@python_2_unicode_compatible</strong>
nltk/sem/evaluate.py:<strong i="63">@python_2_unicode_compatible</strong>
nltk/sem/glue.py:from nltk.compat import python_2_unicode_compatible
nltk/sem/glue.py:<strong i="64">@python_2_unicode_compatible</strong>
nltk/sem/glue.py:<strong i="65">@python_2_unicode_compatible</strong>
nltk/sem/hole.py:from nltk import compat
nltk/sem/hole.py:@compat.python_2_unicode_compatible
nltk/sem/lfg.py:from nltk.compat import python_2_unicode_compatible
nltk/sem/lfg.py:<strong i="66">@python_2_unicode_compatible</strong>
nltk/sem/linearlogic.py:from nltk.compat import python_2_unicode_compatible
nltk/sem/linearlogic.py:<strong i="67">@python_2_unicode_compatible</strong>
nltk/sem/linearlogic.py:<strong i="68">@python_2_unicode_compatible</strong>
nltk/sem/linearlogic.py:<strong i="69">@python_2_unicode_compatible</strong>
nltk/sem/linearlogic.py:<strong i="70">@python_2_unicode_compatible</strong>
nltk/sem/linearlogic.py:<strong i="71">@python_2_unicode_compatible</strong>
nltk/sem/logic.py:from nltk.compat import python_2_unicode_compatible
nltk/sem/logic.py:<strong i="72">@python_2_unicode_compatible</strong>
nltk/sem/logic.py:<strong i="73">@python_2_unicode_compatible</strong>
nltk/sem/logic.py:<strong i="74">@python_2_unicode_compatible</strong>
nltk/sem/logic.py:<strong i="75">@python_2_unicode_compatible</strong>
nltk/sem/logic.py:<strong i="76">@python_2_unicode_compatible</strong>
nltk/sem/logic.py:<strong i="77">@python_2_unicode_compatible</strong>
nltk/sem/logic.py:<strong i="78">@python_2_unicode_compatible</strong>
nltk/sem/logic.py:<strong i="79">@python_2_unicode_compatible</strong>
nltk/sem/logic.py:<strong i="80">@python_2_unicode_compatible</strong>
nltk/sem/logic.py:<strong i="81">@python_2_unicode_compatible</strong>
nltk/sem/logic.py:<strong i="82">@python_2_unicode_compatible</strong>
nltk/sem/logic.py:<strong i="83">@python_2_unicode_compatible</strong>
nltk/sem/logic.py:<strong i="84">@python_2_unicode_compatible</strong>
nltk/sem/logic.py:<strong i="85">@python_2_unicode_compatible</strong>
nltk/sem/logic.py:<strong i="86">@python_2_unicode_compatible</strong>
nltk/sem/util.py:    Check that interpret_sents() is compatible with legacy grammars that use
nltk/sentiment/util.py:        # The protocol=2 parameter is for python2 compatibility
nltk/sentiment/util.py:        (writer, outf) = outf_writer_compat(outfile, encoding, errors, gzip_compress)
nltk/sentiment/util.py:    from nltk.twitter.common import outf_writer_compat, extract_fields
nltk/sentiment/vader.py:# ensure Python 3 compatibility, and refactoring to achieve greater modularity.
nltk/stem/cistem.py:from nltk.compat import python_2_unicode_compatible
nltk/stem/cistem.py:<strong i="87">@python_2_unicode_compatible</strong>
nltk/stem/lancaster.py:from nltk.compat import python_2_unicode_compatible
nltk/stem/lancaster.py:<strong i="88">@python_2_unicode_compatible</strong>
nltk/stem/porter.py:from nltk.compat import python_2_unicode_compatible
nltk/stem/porter.py:<strong i="89">@python_2_unicode_compatible</strong>
nltk/stem/regexp.py:from nltk.compat import python_2_unicode_compatible
nltk/stem/regexp.py:<strong i="90">@python_2_unicode_compatible</strong>
nltk/stem/snowball.py:from nltk import compat
nltk/stem/snowball.py:@compat.python_2_unicode_compatible
nltk/stem/wordnet.py:from nltk.compat import python_2_unicode_compatible
nltk/stem/wordnet.py:<strong i="91">@python_2_unicode_compatible</strong>
nltk/tag/hmm.py:from nltk.compat import python_2_unicode_compatible
nltk/tag/hmm.py:<strong i="92">@python_2_unicode_compatible</strong>
nltk/tag/perceptron.py:from nltk.compat import python_2_unicode_compatible
nltk/tag/perceptron.py:<strong i="93">@python_2_unicode_compatible</strong>
nltk/tag/perceptron.py:                # changed protocol from -1 to 2 to make pickling Python 2 compatible
nltk/tag/senna.py:from nltk.compat import python_2_unicode_compatible
nltk/tag/senna.py:<strong i="94">@python_2_unicode_compatible</strong>
nltk/tag/senna.py:<strong i="95">@python_2_unicode_compatible</strong>
nltk/tag/senna.py:<strong i="96">@python_2_unicode_compatible</strong>
nltk/tag/sequential.py:from nltk.compat import python_2_unicode_compatible
nltk/tag/sequential.py:<strong i="97">@python_2_unicode_compatible</strong>
nltk/tag/sequential.py:<strong i="98">@python_2_unicode_compatible</strong>
nltk/tag/sequential.py:<strong i="99">@python_2_unicode_compatible</strong>
nltk/tag/sequential.py:<strong i="100">@python_2_unicode_compatible</strong>
nltk/tbl/rule.py:from nltk.compat import python_2_unicode_compatible, unicode_repr
nltk/tbl/rule.py:<strong i="101">@python_2_unicode_compatible</strong>
nltk/tbl/rule.py:                # for complete compatibility with the wordy format of nltk2
nltk/tbl/template.py:        An alternative calling convention (kept for backwards compatibility,
nltk/test/compat.doctest:NLTK comes with a Python 2.x/3.x compatibility layer, nltk.compat
nltk/test/compat.doctest:    >>> from nltk import compat
nltk/test/compat.doctest:    >>> compat.PY3
nltk/test/compat.doctest:<strong i="102">@python_2_unicode_compatible</strong>
nltk/test/compat.doctest:``@python_2_unicode_compatible`` decorator allows writing these methods
nltk/test/compat.doctest:in a way compatible with Python 3.x:
nltk/test/compat.doctest:    >>> from nltk.compat import python_2_unicode_compatible
nltk/test/compat.doctest:    >>> <strong i="103">@python_2_unicode_compatible</strong>
nltk/test/compat.doctest:There is no need to wrap a subclass with ``@python_2_unicode_compatible``
nltk/test/compat.doctest:    >>> <strong i="104">@python_2_unicode_compatible</strong>
nltk/test/compat.doctest:Applying ``@python_2_unicode_compatible`` to a subclass
nltk/test/compat.doctest:``nltk.compat.unicode_repr`` function may be used instead of ``repr`` and
nltk/test/compat.doctest:    >>> from nltk.compat import unicode_repr
nltk/test/compat.doctest:of objects which class was fixed by ``@python_2_unicode_compatible``
nltk/test/compat.doctest:    >>> <strong i="105">@python_2_unicode_compatible</strong>
nltk/test/compat.doctest:methods of classes fixed by ``@python_2_unicode_compatible``
nltk/test/compat_fixt.py:from nltk.compat import PY3
nltk/test/compat_fixt.py:        raise SkipTest("compat.doctest is for Python 2.x")
nltk/test/corpus.doctest:    >>> # We use float for backward compatibility with division in Python2.7
nltk/test/data.doctest:    >>> from nltk.compat import StringIO
nltk/test/floresta.txt:O norte-americano Pete Sampras foi afastado pelo seu compatriota Jim Courier (24? ATP) pelos parciais de 7-6 (7-5), 6-4, o que significa que o n?mero um do mundo vai chegar ? ?catedral da terra batida?, Roland Garros, com duas derrotas em outros tantos encontros disputados sobre o p? de tijolo.
grep: nltk/test/images: Is a directory
nltk/test/index.doctest:.. _compat howto: compat.html
nltk/test/index.doctest:* `compat HOWTO`_
nltk/test/portuguese_en_fixt.py:from nltk.compat import PY3
nltk/test/semantics.doctest:In order to provide backwards compatibility with 'legacy' grammars where the semantics value
nltk/test/twitter.ipynb:    "from nltk.compat import StringIO\n",
grep: nltk/test/unit: Is a directory
nltk/tokenize/punkt.py:from nltk.compat import unicode_repr, python_2_unicode_compatible
nltk/tokenize/punkt.py:<strong i="106">@python_2_unicode_compatible</strong>
nltk/tokenize/regexp.py:from nltk.compat import python_2_unicode_compatible
nltk/tokenize/regexp.py:<strong i="107">@python_2_unicode_compatible</strong>
nltk/tokenize/stanford.py:        # Windows is incompatible with NamedTemporaryFile() without passing in delete=False.
nltk/tokenize/stanford_segmenter.py:from nltk import compat
nltk/translate/api.py:from nltk.compat import python_2_unicode_compatible
nltk/translate/api.py:<strong i="108">@python_2_unicode_compatible</strong>
nltk/translate/api.py:<strong i="109">@python_2_unicode_compatible</strong>
nltk/translate/bleu_score.py:    from nltk.compat import Fraction
nltk/twitter/api.py:from nltk.compat import UTC
nltk/twitter/common.py:from nltk import compat
nltk/twitter/common.py:    (writer, outf) = outf_writer_compat(outfile, encoding, errors, gzip_compress)
nltk/twitter/common.py:def outf_writer_compat(outfile, encoding, errors, gzip_compress=False):
nltk/twitter/common.py:    if compat.PY3:
nltk/twitter/common.py:        writer = compat.UnicodeWriter(outf, encoding=encoding, errors=errors)
nltk/twitter/common.py:    (writer, outf) = outf_writer_compat(outfile, encoding, errors, gzip_compress)
nltk/twitter/twitter_demo.py:from nltk.compat import StringIO

还有一些低调的果实：

~/git-stuff/my-contrib/nltk$ grep "sys.version" nltk/**/*
grep: nltk/corpus/reader: Is a directory
nltk/lm/vocabulary.py:    if sys.version_info[0] == 2:
nltk/sem/evaluate.py:    if sys.version_info[0] >= 3:
nltk/sentiment/util.py:    if sys.version_info[0] == 3:
nltk/sentiment/util.py:    elif sys.version_info[0] < 3:
grep: nltk/test/images: Is a directory
grep: nltk/test/unit: Is a directory

有了 #2432 对 Python 3.8 的支持，也许是时候正式放弃 Python 2.7 了？ 现在是 2020 年 =)

P/S：它已经脱离了我们的 CI 工作流程很长一段时间了。

如果 #2504 被合并，Python 2 中仍有一些东西：

• [x] nltk/test/doctest_nose_plugin.py中的测试插件，它忽略 Unicode 文字中的前导 u 并确保相等比较成功。 如果要删除此插件，他们将需要确保从测试中删除所有 Unicode 文字。
• [ ] web/dev/local_testing.rst仍然提到 Python 2 并且应该更新。
• [ ] 在代码中提及Python 2.7和Python 2.6 ，应检查它们是否仍然相关