:mod:`nltk`
===========

.. automodule:: nltk

   
   
   Functions
   ---------
   .. autosummary::
      :toctree:generated/
      :template:func_custom.rst

   
      accuracy
      add_logs
      alignment_error_rate
      apply_features
      approxrand
      arity
      bigrams
      binary_distance
      binary_search_file
      binding_ops
      bleu
      boolean_ops
      bracket_parse
      breadth_first
      build_opener
      call_megam
      casual_tokenize
      choose
      clause
      clean_html
      clean_url
      config_java
      config_megam
      config_weka
      conflicts
      conllstr2tree
      conlltags2tree
      custom_distance
      decorator
      demo
      download_gui
      download_shell
      edit_distance
      elementtree_indent
      entropy
      equality_preds
      evaluate_sents
      everygrams
      extract_rels
      extract_test_sentences
      f_measure
      filestring
      flatten
      fractional_presence
      getproxies
      ghd
      guess_encoding
      ieerstr2tree
      in_idle
      induce_pcfg
      install_opener
      interpret_sents
      interval_distance
      invert_dict
      invert_graph
      is_rel
      jaccard_distance
      line_tokenize
      load
      load_parser
      log_likelihood
      map_tag
      masi_distance
      memoize
      ne_chunk
      ne_chunk_sents
      ngrams
      nonterminals
      pad_sequence
      parse_sents
      pk
      pos_tag
      pos_tag_sents
      pprint
      pr
      precision
      presence
      print_string
      py25
      py26
      py27
      python_2_unicode_compatible
      raise_unorderable_types
      ranks_from_scores
      ranks_from_sequence
      re_show
      read_grammar
      read_logic
      read_valuation
      recall
      regexp_span_tokenize
      regexp_tokenize
      register_tag
      ribes
      root_semrep
      rte_classifier
      rte_features
      rtuple
      sent_tokenize
      set2rel
      set_proxy
      sinica_parse
      skipgrams
      skolemize
      slice_bounds
      spearman_correlation
      str2tuple
      string_span_tokenize
      subsumes
      sum_logs
      tagset_mapping
      tagstr2tree
      tokenwrap
      total_ordering
      transitive_closure
      tree2conllstr
      tree2conlltags
      trigrams
      tuple2str
      unify
      unique_list
      untag
      usage
      windowdiff
      word_tokenize

   .. toctree::
       :maxdepth: 1
       :hidden:

   
       generated/nltk.accuracy
       generated/nltk.add_logs
       generated/nltk.alignment_error_rate
       generated/nltk.apply_features
       generated/nltk.approxrand
       generated/nltk.arity
       generated/nltk.bigrams
       generated/nltk.binary_distance
       generated/nltk.binary_search_file
       generated/nltk.binding_ops
       generated/nltk.bleu
       generated/nltk.boolean_ops
       generated/nltk.bracket_parse
       generated/nltk.breadth_first
       generated/nltk.build_opener
       generated/nltk.call_megam
       generated/nltk.casual_tokenize
       generated/nltk.choose
       generated/nltk.clause
       generated/nltk.clean_html
       generated/nltk.clean_url
       generated/nltk.config_java
       generated/nltk.config_megam
       generated/nltk.config_weka
       generated/nltk.conflicts
       generated/nltk.conllstr2tree
       generated/nltk.conlltags2tree
       generated/nltk.custom_distance
       generated/nltk.decorator
       generated/nltk.demo
       generated/nltk.download_gui
       generated/nltk.download_shell
       generated/nltk.edit_distance
       generated/nltk.elementtree_indent
       generated/nltk.entropy
       generated/nltk.equality_preds
       generated/nltk.evaluate_sents
       generated/nltk.everygrams
       generated/nltk.extract_rels
       generated/nltk.extract_test_sentences
       generated/nltk.f_measure
       generated/nltk.filestring
       generated/nltk.flatten
       generated/nltk.fractional_presence
       generated/nltk.getproxies
       generated/nltk.ghd
       generated/nltk.guess_encoding
       generated/nltk.ieerstr2tree
       generated/nltk.in_idle
       generated/nltk.induce_pcfg
       generated/nltk.install_opener
       generated/nltk.interpret_sents
       generated/nltk.interval_distance
       generated/nltk.invert_dict
       generated/nltk.invert_graph
       generated/nltk.is_rel
       generated/nltk.jaccard_distance
       generated/nltk.line_tokenize
       generated/nltk.load
       generated/nltk.load_parser
       generated/nltk.log_likelihood
       generated/nltk.map_tag
       generated/nltk.masi_distance
       generated/nltk.memoize
       generated/nltk.ne_chunk
       generated/nltk.ne_chunk_sents
       generated/nltk.ngrams
       generated/nltk.nonterminals
       generated/nltk.pad_sequence
       generated/nltk.parse_sents
       generated/nltk.pk
       generated/nltk.pos_tag
       generated/nltk.pos_tag_sents
       generated/nltk.pprint
       generated/nltk.pr
       generated/nltk.precision
       generated/nltk.presence
       generated/nltk.print_string
       generated/nltk.py25
       generated/nltk.py26
       generated/nltk.py27
       generated/nltk.python_2_unicode_compatible
       generated/nltk.raise_unorderable_types
       generated/nltk.ranks_from_scores
       generated/nltk.ranks_from_sequence
       generated/nltk.re_show
       generated/nltk.read_grammar
       generated/nltk.read_logic
       generated/nltk.read_valuation
       generated/nltk.recall
       generated/nltk.regexp_span_tokenize
       generated/nltk.regexp_tokenize
       generated/nltk.register_tag
       generated/nltk.ribes
       generated/nltk.root_semrep
       generated/nltk.rte_classifier
       generated/nltk.rte_features
       generated/nltk.rtuple
       generated/nltk.sent_tokenize
       generated/nltk.set2rel
       generated/nltk.set_proxy
       generated/nltk.sinica_parse
       generated/nltk.skipgrams
       generated/nltk.skolemize
       generated/nltk.slice_bounds
       generated/nltk.spearman_correlation
       generated/nltk.str2tuple
       generated/nltk.string_span_tokenize
       generated/nltk.subsumes
       generated/nltk.sum_logs
       generated/nltk.tagset_mapping
       generated/nltk.tagstr2tree
       generated/nltk.tokenwrap
       generated/nltk.total_ordering
       generated/nltk.transitive_closure
       generated/nltk.tree2conllstr
       generated/nltk.tree2conlltags
       generated/nltk.trigrams
       generated/nltk.tuple2str
       generated/nltk.unify
       generated/nltk.unique_list
       generated/nltk.untag
       generated/nltk.usage
       generated/nltk.windowdiff
       generated/nltk.word_tokenize
      
   
   

   
   
   Classes
   -------
   .. autosummary::
      :toctree:generated/
      :template:class_custom.rst

   
      AbstractLazySequence
      AffixTagger
      AlignedSent
      Alignment
      AnnotationTask
      ApplicationExpression
      Assignment
      BigramAssocMeasures
      BigramCollocationFinder
      BigramTagger
      BinaryMaxentFeatureEncoding
      BlanklineTokenizer
      BllipParser
      BottomUpChartParser
      BottomUpLeftCornerChartParser
      BottomUpProbabilisticChartParser
      Boxer
      BrillTagger
      BrillTaggerTrainer
      CFG
      CRFTagger
      CfgReadingCommand
      ChartParser
      ChunkParserI
      ChunkScore
      ClassifierBasedPOSTagger
      ClassifierBasedTagger
      ClassifierI
      ConcordanceIndex
      ConditionalExponentialClassifier
      ConditionalFreqDist
      ConditionalProbDist
      ConditionalProbDistI
      ConfusionMatrix
      ContextIndex
      ContextTagger
      ContingencyMeasures
      CrossValidationProbDist
      DRS
      DecisionTreeClassifier
      DefaultTagger
      DependencyEvaluator
      DependencyGrammar
      DependencyGraph
      DependencyProduction
      DictionaryConditionalProbDist
      DictionaryProbDist
      DiscourseTester
      DrtExpression
      DrtGlueReadingCommand
      ELEProbDist
      EarleyChartParser
      Expression
      FStructure
      FeatDict
      FeatList
      FeatStruct
      FeatStructReader
      Feature
      FeatureBottomUpChartParser
      FeatureBottomUpLeftCornerChartParser
      FeatureChartParser
      FeatureEarleyChartParser
      FeatureIncrementalBottomUpChartParser
      FeatureIncrementalBottomUpLeftCornerChartParser
      FeatureIncrementalChartParser
      FeatureIncrementalTopDownChartParser
      FeatureTopDownChartParser
      FreqDist
      HTTPPasswordMgrWithDefaultRealm
      HeldoutProbDist
      HiddenMarkovModelTagger
      HiddenMarkovModelTrainer
      HunposTagger
      IBMModel
      IBMModel1
      IBMModel2
      IBMModel3
      IBMModel4
      IBMModel5
      ISRIStemmer
      ImmutableMultiParentedTree
      ImmutableParentedTree
      ImmutableProbabilisticMixIn
      ImmutableProbabilisticTree
      ImmutableTree
      IncrementalBottomUpChartParser
      IncrementalBottomUpLeftCornerChartParser
      IncrementalChartParser
      IncrementalLeftCornerChartParser
      IncrementalTopDownChartParser
      Index
      InsideChartParser
      JSONTaggedDecoder
      JSONTaggedEncoder
      KneserNeyProbDist
      LancasterStemmer
      LaplaceProbDist
      LazyConcatenation
      LazyEnumerate
      LazyMap
      LazySubsequence
      LazyZip
      LeftCornerChartParser
      LidstoneProbDist
      LineTokenizer
      LongestChartParser
      MLEProbDist
      MWETokenizer
      Mace
      MaceCommand
      MaltParser
      MaxentClassifier
      Model
      MultiClassifierI
      MultiParentedTree
      MutableProbDist
      NaiveBayesClassifier
      NaiveBayesDependencyScorer
      NgramAssocMeasures
      NgramTagger
      NonprojectiveDependencyParser
      Nonterminal
      OrderedDict
      PCFG
      Paice
      ParallelProverBuilder
      ParallelProverBuilderCommand
      ParentedTree
      ParserI
      PerceptronTagger
      PhraseTable
      PorterStemmer
      PositiveNaiveBayesClassifier
      ProbDistI
      ProbabilisticDependencyGrammar
      ProbabilisticMixIn
      ProbabilisticNonprojectiveParser
      ProbabilisticProduction
      ProbabilisticProjectiveDependencyParser
      ProbabilisticTree
      Production
      ProjectiveDependencyParser
      Prover9
      Prover9Command
      ProxyBasicAuthHandler
      ProxyDigestAuthHandler
      ProxyHandler
      PunktSentenceTokenizer
      QuadgramCollocationFinder
      RSLPStemmer
      RTEFeatureExtractor
      RandomChartParser
      RangeFeature
      ReadingCommand
      RecursiveDescentParser
      RegexpChunkParser
      RegexpParser
      RegexpStemmer
      RegexpTagger
      RegexpTokenizer
      ResolutionProver
      ResolutionProverCommand
      SExprTokenizer
      Senna
      SennaChunkTagger
      SennaNERTagger
      SennaTagger
      SequentialBackoffTagger
      ShiftReduceParser
      SimpleGoodTuringProbDist
      SklearnClassifier
      SlashFeature
      SnowballStemmer
      SpaceTokenizer
      StackDecoder
      StanfordNERTagger
      StanfordPOSTagger
      StanfordTagger
      StanfordTokenizer
      StemmerI
      SteppingChartParser
      SteppingRecursiveDescentParser
      SteppingShiftReduceParser
      TabTokenizer
      TableauProver
      TableauProverCommand
      TaggerI
      TestGrammar
      Text
      TextCat
      TextCollection
      TextTilingTokenizer
      TnT
      TokenSearcher
      TopDownChartParser
      TransitionParser
      Tree
      TreebankWordTokenizer
      Trie
      TrigramAssocMeasures
      TrigramCollocationFinder
      TrigramTagger
      TweetTokenizer
      TypedMaxentFeatureEncoding
      UniformProbDist
      UnigramTagger
      UnsortedChartParser
      Valuation
      Variable
      ViterbiParser
      WekaClassifier
      WhitespaceTokenizer
      WittenBellProbDist
      WordNetLemmatizer
      WordPunctTokenizer
      chain
      combinations
      defaultdict
      deque
      islice
      text_type

   .. toctree::
       :maxdepth: 1
       :hidden:

   
       generated/nltk.AbstractLazySequence
       generated/nltk.AffixTagger
       generated/nltk.AlignedSent
       generated/nltk.Alignment
       generated/nltk.AnnotationTask
       generated/nltk.ApplicationExpression
       generated/nltk.Assignment
       generated/nltk.BigramAssocMeasures
       generated/nltk.BigramCollocationFinder
       generated/nltk.BigramTagger
       generated/nltk.BinaryMaxentFeatureEncoding
       generated/nltk.BlanklineTokenizer
       generated/nltk.BllipParser
       generated/nltk.BottomUpChartParser
       generated/nltk.BottomUpLeftCornerChartParser
       generated/nltk.BottomUpProbabilisticChartParser
       generated/nltk.Boxer
       generated/nltk.BrillTagger
       generated/nltk.BrillTaggerTrainer
       generated/nltk.CFG
       generated/nltk.CRFTagger
       generated/nltk.CfgReadingCommand
       generated/nltk.ChartParser
       generated/nltk.ChunkParserI
       generated/nltk.ChunkScore
       generated/nltk.ClassifierBasedPOSTagger
       generated/nltk.ClassifierBasedTagger
       generated/nltk.ClassifierI
       generated/nltk.ConcordanceIndex
       generated/nltk.ConditionalExponentialClassifier
       generated/nltk.ConditionalFreqDist
       generated/nltk.ConditionalProbDist
       generated/nltk.ConditionalProbDistI
       generated/nltk.ConfusionMatrix
       generated/nltk.ContextIndex
       generated/nltk.ContextTagger
       generated/nltk.ContingencyMeasures
       generated/nltk.CrossValidationProbDist
       generated/nltk.DRS
       generated/nltk.DecisionTreeClassifier
       generated/nltk.DefaultTagger
       generated/nltk.DependencyEvaluator
       generated/nltk.DependencyGrammar
       generated/nltk.DependencyGraph
       generated/nltk.DependencyProduction
       generated/nltk.DictionaryConditionalProbDist
       generated/nltk.DictionaryProbDist
       generated/nltk.DiscourseTester
       generated/nltk.DrtExpression
       generated/nltk.DrtGlueReadingCommand
       generated/nltk.ELEProbDist
       generated/nltk.EarleyChartParser
       generated/nltk.Expression
       generated/nltk.FStructure
       generated/nltk.FeatDict
       generated/nltk.FeatList
       generated/nltk.FeatStruct
       generated/nltk.FeatStructReader
       generated/nltk.Feature
       generated/nltk.FeatureBottomUpChartParser
       generated/nltk.FeatureBottomUpLeftCornerChartParser
       generated/nltk.FeatureChartParser
       generated/nltk.FeatureEarleyChartParser
       generated/nltk.FeatureIncrementalBottomUpChartParser
       generated/nltk.FeatureIncrementalBottomUpLeftCornerChartParser
       generated/nltk.FeatureIncrementalChartParser
       generated/nltk.FeatureIncrementalTopDownChartParser
       generated/nltk.FeatureTopDownChartParser
       generated/nltk.FreqDist
       generated/nltk.HTTPPasswordMgrWithDefaultRealm
       generated/nltk.HeldoutProbDist
       generated/nltk.HiddenMarkovModelTagger
       generated/nltk.HiddenMarkovModelTrainer
       generated/nltk.HunposTagger
       generated/nltk.IBMModel
       generated/nltk.IBMModel1
       generated/nltk.IBMModel2
       generated/nltk.IBMModel3
       generated/nltk.IBMModel4
       generated/nltk.IBMModel5
       generated/nltk.ISRIStemmer
       generated/nltk.ImmutableMultiParentedTree
       generated/nltk.ImmutableParentedTree
       generated/nltk.ImmutableProbabilisticMixIn
       generated/nltk.ImmutableProbabilisticTree
       generated/nltk.ImmutableTree
       generated/nltk.IncrementalBottomUpChartParser
       generated/nltk.IncrementalBottomUpLeftCornerChartParser
       generated/nltk.IncrementalChartParser
       generated/nltk.IncrementalLeftCornerChartParser
       generated/nltk.IncrementalTopDownChartParser
       generated/nltk.Index
       generated/nltk.InsideChartParser
       generated/nltk.JSONTaggedDecoder
       generated/nltk.JSONTaggedEncoder
       generated/nltk.KneserNeyProbDist
       generated/nltk.LancasterStemmer
       generated/nltk.LaplaceProbDist
       generated/nltk.LazyConcatenation
       generated/nltk.LazyEnumerate
       generated/nltk.LazyMap
       generated/nltk.LazySubsequence
       generated/nltk.LazyZip
       generated/nltk.LeftCornerChartParser
       generated/nltk.LidstoneProbDist
       generated/nltk.LineTokenizer
       generated/nltk.LongestChartParser
       generated/nltk.MLEProbDist
       generated/nltk.MWETokenizer
       generated/nltk.Mace
       generated/nltk.MaceCommand
       generated/nltk.MaltParser
       generated/nltk.MaxentClassifier
       generated/nltk.Model
       generated/nltk.MultiClassifierI
       generated/nltk.MultiParentedTree
       generated/nltk.MutableProbDist
       generated/nltk.NaiveBayesClassifier
       generated/nltk.NaiveBayesDependencyScorer
       generated/nltk.NgramAssocMeasures
       generated/nltk.NgramTagger
       generated/nltk.NonprojectiveDependencyParser
       generated/nltk.Nonterminal
       generated/nltk.OrderedDict
       generated/nltk.PCFG
       generated/nltk.Paice
       generated/nltk.ParallelProverBuilder
       generated/nltk.ParallelProverBuilderCommand
       generated/nltk.ParentedTree
       generated/nltk.ParserI
       generated/nltk.PerceptronTagger
       generated/nltk.PhraseTable
       generated/nltk.PorterStemmer
       generated/nltk.PositiveNaiveBayesClassifier
       generated/nltk.ProbDistI
       generated/nltk.ProbabilisticDependencyGrammar
       generated/nltk.ProbabilisticMixIn
       generated/nltk.ProbabilisticNonprojectiveParser
       generated/nltk.ProbabilisticProduction
       generated/nltk.ProbabilisticProjectiveDependencyParser
       generated/nltk.ProbabilisticTree
       generated/nltk.Production
       generated/nltk.ProjectiveDependencyParser
       generated/nltk.Prover9
       generated/nltk.Prover9Command
       generated/nltk.ProxyBasicAuthHandler
       generated/nltk.ProxyDigestAuthHandler
       generated/nltk.ProxyHandler
       generated/nltk.PunktSentenceTokenizer
       generated/nltk.QuadgramCollocationFinder
       generated/nltk.RSLPStemmer
       generated/nltk.RTEFeatureExtractor
       generated/nltk.RandomChartParser
       generated/nltk.RangeFeature
       generated/nltk.ReadingCommand
       generated/nltk.RecursiveDescentParser
       generated/nltk.RegexpChunkParser
       generated/nltk.RegexpParser
       generated/nltk.RegexpStemmer
       generated/nltk.RegexpTagger
       generated/nltk.RegexpTokenizer
       generated/nltk.ResolutionProver
       generated/nltk.ResolutionProverCommand
       generated/nltk.SExprTokenizer
       generated/nltk.Senna
       generated/nltk.SennaChunkTagger
       generated/nltk.SennaNERTagger
       generated/nltk.SennaTagger
       generated/nltk.SequentialBackoffTagger
       generated/nltk.ShiftReduceParser
       generated/nltk.SimpleGoodTuringProbDist
       generated/nltk.SklearnClassifier
       generated/nltk.SlashFeature
       generated/nltk.SnowballStemmer
       generated/nltk.SpaceTokenizer
       generated/nltk.StackDecoder
       generated/nltk.StanfordNERTagger
       generated/nltk.StanfordPOSTagger
       generated/nltk.StanfordTagger
       generated/nltk.StanfordTokenizer
       generated/nltk.StemmerI
       generated/nltk.SteppingChartParser
       generated/nltk.SteppingRecursiveDescentParser
       generated/nltk.SteppingShiftReduceParser
       generated/nltk.TabTokenizer
       generated/nltk.TableauProver
       generated/nltk.TableauProverCommand
       generated/nltk.TaggerI
       generated/nltk.TestGrammar
       generated/nltk.Text
       generated/nltk.TextCat
       generated/nltk.TextCollection
       generated/nltk.TextTilingTokenizer
       generated/nltk.TnT
       generated/nltk.TokenSearcher
       generated/nltk.TopDownChartParser
       generated/nltk.TransitionParser
       generated/nltk.Tree
       generated/nltk.TreebankWordTokenizer
       generated/nltk.Trie
       generated/nltk.TrigramAssocMeasures
       generated/nltk.TrigramCollocationFinder
       generated/nltk.TrigramTagger
       generated/nltk.TweetTokenizer
       generated/nltk.TypedMaxentFeatureEncoding
       generated/nltk.UniformProbDist
       generated/nltk.UnigramTagger
       generated/nltk.UnsortedChartParser
       generated/nltk.Valuation
       generated/nltk.Variable
       generated/nltk.ViterbiParser
       generated/nltk.WekaClassifier
       generated/nltk.WhitespaceTokenizer
       generated/nltk.WittenBellProbDist
       generated/nltk.WordNetLemmatizer
       generated/nltk.WordPunctTokenizer
       generated/nltk.chain
       generated/nltk.combinations
       generated/nltk.defaultdict
       generated/nltk.deque
       generated/nltk.islice
       generated/nltk.text_type

   
   

   
   
   Exceptions
   ----------
   .. autosummary::
      :toctree:

   
      LogicalExpressionException
      Undefined