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<!DOCTYPE html>
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<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="theme-color" content="#2D2D2D" />
<title>NLTK :: nltk.book</title>
<link rel="stylesheet" href="../../_static/css/nltk_theme.css"/>
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<h1>Source code for nltk.book</h1><div class="highlight"><pre>
<span></span><span class="c1"># Natural Language Toolkit: Some texts for exploration in chapter 1 of the book</span>
<span class="c1">#</span>
<span class="c1"># Copyright (C) 2001-2021 NLTK Project</span>
<span class="c1"># Author: Steven Bird <stevenbird1@gmail.com></span>
<span class="c1">#</span>
<span class="c1"># URL: <http://nltk.org/></span>
<span class="c1"># For license information, see LICENSE.TXT</span>
<span class="kn">from</span> <span class="nn">nltk.corpus</span> <span class="kn">import</span> <span class="p">(</span>
<span class="n">genesis</span><span class="p">,</span>
<span class="n">gutenberg</span><span class="p">,</span>
<span class="n">inaugural</span><span class="p">,</span>
<span class="n">nps_chat</span><span class="p">,</span>
<span class="n">treebank</span><span class="p">,</span>
<span class="n">webtext</span><span class="p">,</span>
<span class="n">wordnet</span><span class="p">,</span>
<span class="p">)</span>
<span class="kn">from</span> <span class="nn">nltk.probability</span> <span class="kn">import</span> <span class="n">FreqDist</span>
<span class="kn">from</span> <span class="nn">nltk.text</span> <span class="kn">import</span> <span class="n">Text</span>
<span class="kn">from</span> <span class="nn">nltk.util</span> <span class="kn">import</span> <span class="n">bigrams</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"*** Introductory Examples for the NLTK Book ***"</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Loading text1, ..., text9 and sent1, ..., sent9"</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Type the name of the text or sentence to view it."</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Type: 'texts()' or 'sents()' to list the materials."</span><span class="p">)</span>
<span class="n">text1</span> <span class="o">=</span> <span class="n">Text</span><span class="p">(</span><span class="n">gutenberg</span><span class="o">.</span><span class="n">words</span><span class="p">(</span><span class="s2">"melville-moby_dick.txt"</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"text1:"</span><span class="p">,</span> <span class="n">text1</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="n">text2</span> <span class="o">=</span> <span class="n">Text</span><span class="p">(</span><span class="n">gutenberg</span><span class="o">.</span><span class="n">words</span><span class="p">(</span><span class="s2">"austen-sense.txt"</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"text2:"</span><span class="p">,</span> <span class="n">text2</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="n">text3</span> <span class="o">=</span> <span class="n">Text</span><span class="p">(</span><span class="n">genesis</span><span class="o">.</span><span class="n">words</span><span class="p">(</span><span class="s2">"english-kjv.txt"</span><span class="p">),</span> <span class="n">name</span><span class="o">=</span><span class="s2">"The Book of Genesis"</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"text3:"</span><span class="p">,</span> <span class="n">text3</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="n">text4</span> <span class="o">=</span> <span class="n">Text</span><span class="p">(</span><span class="n">inaugural</span><span class="o">.</span><span class="n">words</span><span class="p">(),</span> <span class="n">name</span><span class="o">=</span><span class="s2">"Inaugural Address Corpus"</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"text4:"</span><span class="p">,</span> <span class="n">text4</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="n">text5</span> <span class="o">=</span> <span class="n">Text</span><span class="p">(</span><span class="n">nps_chat</span><span class="o">.</span><span class="n">words</span><span class="p">(),</span> <span class="n">name</span><span class="o">=</span><span class="s2">"Chat Corpus"</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"text5:"</span><span class="p">,</span> <span class="n">text5</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="n">text6</span> <span class="o">=</span> <span class="n">Text</span><span class="p">(</span><span class="n">webtext</span><span class="o">.</span><span class="n">words</span><span class="p">(</span><span class="s2">"grail.txt"</span><span class="p">),</span> <span class="n">name</span><span class="o">=</span><span class="s2">"Monty Python and the Holy Grail"</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"text6:"</span><span class="p">,</span> <span class="n">text6</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="n">text7</span> <span class="o">=</span> <span class="n">Text</span><span class="p">(</span><span class="n">treebank</span><span class="o">.</span><span class="n">words</span><span class="p">(),</span> <span class="n">name</span><span class="o">=</span><span class="s2">"Wall Street Journal"</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"text7:"</span><span class="p">,</span> <span class="n">text7</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="n">text8</span> <span class="o">=</span> <span class="n">Text</span><span class="p">(</span><span class="n">webtext</span><span class="o">.</span><span class="n">words</span><span class="p">(</span><span class="s2">"singles.txt"</span><span class="p">),</span> <span class="n">name</span><span class="o">=</span><span class="s2">"Personals Corpus"</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"text8:"</span><span class="p">,</span> <span class="n">text8</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="n">text9</span> <span class="o">=</span> <span class="n">Text</span><span class="p">(</span><span class="n">gutenberg</span><span class="o">.</span><span class="n">words</span><span class="p">(</span><span class="s2">"chesterton-thursday.txt"</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"text9:"</span><span class="p">,</span> <span class="n">text9</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<div class="viewcode-block" id="texts"><a class="viewcode-back" href="../../api/nltk.book.html#nltk.book.texts">[docs]</a><span class="k">def</span> <span class="nf">texts</span><span class="p">():</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"text1:"</span><span class="p">,</span> <span class="n">text1</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"text2:"</span><span class="p">,</span> <span class="n">text2</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"text3:"</span><span class="p">,</span> <span class="n">text3</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"text4:"</span><span class="p">,</span> <span class="n">text4</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"text5:"</span><span class="p">,</span> <span class="n">text5</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"text6:"</span><span class="p">,</span> <span class="n">text6</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"text7:"</span><span class="p">,</span> <span class="n">text7</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"text8:"</span><span class="p">,</span> <span class="n">text8</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"text9:"</span><span class="p">,</span> <span class="n">text9</span><span class="o">.</span><span class="n">name</span><span class="p">)</span></div>
<span class="n">sent1</span> <span class="o">=</span> <span class="p">[</span><span class="s2">"Call"</span><span class="p">,</span> <span class="s2">"me"</span><span class="p">,</span> <span class="s2">"Ishmael"</span><span class="p">,</span> <span class="s2">"."</span><span class="p">]</span>
<span class="n">sent2</span> <span class="o">=</span> <span class="p">[</span>
<span class="s2">"The"</span><span class="p">,</span>
<span class="s2">"family"</span><span class="p">,</span>
<span class="s2">"of"</span><span class="p">,</span>
<span class="s2">"Dashwood"</span><span class="p">,</span>
<span class="s2">"had"</span><span class="p">,</span>
<span class="s2">"long"</span><span class="p">,</span>
<span class="s2">"been"</span><span class="p">,</span>
<span class="s2">"settled"</span><span class="p">,</span>
<span class="s2">"in"</span><span class="p">,</span>
<span class="s2">"Sussex"</span><span class="p">,</span>
<span class="s2">"."</span><span class="p">,</span>
<span class="p">]</span>
<span class="n">sent3</span> <span class="o">=</span> <span class="p">[</span>
<span class="s2">"In"</span><span class="p">,</span>
<span class="s2">"the"</span><span class="p">,</span>
<span class="s2">"beginning"</span><span class="p">,</span>
<span class="s2">"God"</span><span class="p">,</span>
<span class="s2">"created"</span><span class="p">,</span>
<span class="s2">"the"</span><span class="p">,</span>
<span class="s2">"heaven"</span><span class="p">,</span>
<span class="s2">"and"</span><span class="p">,</span>
<span class="s2">"the"</span><span class="p">,</span>
<span class="s2">"earth"</span><span class="p">,</span>
<span class="s2">"."</span><span class="p">,</span>
<span class="p">]</span>
<span class="n">sent4</span> <span class="o">=</span> <span class="p">[</span>
<span class="s2">"Fellow"</span><span class="p">,</span>
<span class="s2">"-"</span><span class="p">,</span>
<span class="s2">"Citizens"</span><span class="p">,</span>
<span class="s2">"of"</span><span class="p">,</span>
<span class="s2">"the"</span><span class="p">,</span>
<span class="s2">"Senate"</span><span class="p">,</span>
<span class="s2">"and"</span><span class="p">,</span>
<span class="s2">"of"</span><span class="p">,</span>
<span class="s2">"the"</span><span class="p">,</span>
<span class="s2">"House"</span><span class="p">,</span>
<span class="s2">"of"</span><span class="p">,</span>
<span class="s2">"Representatives"</span><span class="p">,</span>
<span class="s2">":"</span><span class="p">,</span>
<span class="p">]</span>
<span class="n">sent5</span> <span class="o">=</span> <span class="p">[</span>
<span class="s2">"I"</span><span class="p">,</span>
<span class="s2">"have"</span><span class="p">,</span>
<span class="s2">"a"</span><span class="p">,</span>
<span class="s2">"problem"</span><span class="p">,</span>
<span class="s2">"with"</span><span class="p">,</span>
<span class="s2">"people"</span><span class="p">,</span>
<span class="s2">"PMing"</span><span class="p">,</span>
<span class="s2">"me"</span><span class="p">,</span>
<span class="s2">"to"</span><span class="p">,</span>
<span class="s2">"lol"</span><span class="p">,</span>
<span class="s2">"JOIN"</span><span class="p">,</span>
<span class="p">]</span>
<span class="n">sent6</span> <span class="o">=</span> <span class="p">[</span>
<span class="s2">"SCENE"</span><span class="p">,</span>
<span class="s2">"1"</span><span class="p">,</span>
<span class="s2">":"</span><span class="p">,</span>
<span class="s2">"["</span><span class="p">,</span>
<span class="s2">"wind"</span><span class="p">,</span>
<span class="s2">"]"</span><span class="p">,</span>
<span class="s2">"["</span><span class="p">,</span>
<span class="s2">"clop"</span><span class="p">,</span>
<span class="s2">"clop"</span><span class="p">,</span>
<span class="s2">"clop"</span><span class="p">,</span>
<span class="s2">"]"</span><span class="p">,</span>
<span class="s2">"KING"</span><span class="p">,</span>
<span class="s2">"ARTHUR"</span><span class="p">,</span>
<span class="s2">":"</span><span class="p">,</span>
<span class="s2">"Whoa"</span><span class="p">,</span>
<span class="s2">"there"</span><span class="p">,</span>
<span class="s2">"!"</span><span class="p">,</span>
<span class="p">]</span>
<span class="n">sent7</span> <span class="o">=</span> <span class="p">[</span>
<span class="s2">"Pierre"</span><span class="p">,</span>
<span class="s2">"Vinken"</span><span class="p">,</span>
<span class="s2">","</span><span class="p">,</span>
<span class="s2">"61"</span><span class="p">,</span>
<span class="s2">"years"</span><span class="p">,</span>
<span class="s2">"old"</span><span class="p">,</span>
<span class="s2">","</span><span class="p">,</span>
<span class="s2">"will"</span><span class="p">,</span>
<span class="s2">"join"</span><span class="p">,</span>
<span class="s2">"the"</span><span class="p">,</span>
<span class="s2">"board"</span><span class="p">,</span>
<span class="s2">"as"</span><span class="p">,</span>
<span class="s2">"a"</span><span class="p">,</span>
<span class="s2">"nonexecutive"</span><span class="p">,</span>
<span class="s2">"director"</span><span class="p">,</span>
<span class="s2">"Nov."</span><span class="p">,</span>
<span class="s2">"29"</span><span class="p">,</span>
<span class="s2">"."</span><span class="p">,</span>
<span class="p">]</span>
<span class="n">sent8</span> <span class="o">=</span> <span class="p">[</span>
<span class="s2">"25"</span><span class="p">,</span>
<span class="s2">"SEXY"</span><span class="p">,</span>
<span class="s2">"MALE"</span><span class="p">,</span>
<span class="s2">","</span><span class="p">,</span>
<span class="s2">"seeks"</span><span class="p">,</span>
<span class="s2">"attrac"</span><span class="p">,</span>
<span class="s2">"older"</span><span class="p">,</span>
<span class="s2">"single"</span><span class="p">,</span>
<span class="s2">"lady"</span><span class="p">,</span>
<span class="s2">","</span><span class="p">,</span>
<span class="s2">"for"</span><span class="p">,</span>
<span class="s2">"discreet"</span><span class="p">,</span>
<span class="s2">"encounters"</span><span class="p">,</span>
<span class="s2">"."</span><span class="p">,</span>
<span class="p">]</span>
<span class="n">sent9</span> <span class="o">=</span> <span class="p">[</span>
<span class="s2">"THE"</span><span class="p">,</span>
<span class="s2">"suburb"</span><span class="p">,</span>
<span class="s2">"of"</span><span class="p">,</span>
<span class="s2">"Saffron"</span><span class="p">,</span>
<span class="s2">"Park"</span><span class="p">,</span>
<span class="s2">"lay"</span><span class="p">,</span>
<span class="s2">"on"</span><span class="p">,</span>
<span class="s2">"the"</span><span class="p">,</span>
<span class="s2">"sunset"</span><span class="p">,</span>
<span class="s2">"side"</span><span class="p">,</span>
<span class="s2">"of"</span><span class="p">,</span>
<span class="s2">"London"</span><span class="p">,</span>
<span class="s2">","</span><span class="p">,</span>
<span class="s2">"as"</span><span class="p">,</span>
<span class="s2">"red"</span><span class="p">,</span>
<span class="s2">"and"</span><span class="p">,</span>
<span class="s2">"ragged"</span><span class="p">,</span>
<span class="s2">"as"</span><span class="p">,</span>
<span class="s2">"a"</span><span class="p">,</span>
<span class="s2">"cloud"</span><span class="p">,</span>
<span class="s2">"of"</span><span class="p">,</span>
<span class="s2">"sunset"</span><span class="p">,</span>
<span class="s2">"."</span><span class="p">,</span>
<span class="p">]</span>
<div class="viewcode-block" id="sents"><a class="viewcode-back" href="../../api/nltk.book.html#nltk.book.sents">[docs]</a><span class="k">def</span> <span class="nf">sents</span><span class="p">():</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"sent1:"</span><span class="p">,</span> <span class="s2">" "</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">sent1</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"sent2:"</span><span class="p">,</span> <span class="s2">" "</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">sent2</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"sent3:"</span><span class="p">,</span> <span class="s2">" "</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">sent3</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"sent4:"</span><span class="p">,</span> <span class="s2">" "</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">sent4</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"sent5:"</span><span class="p">,</span> <span class="s2">" "</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">sent5</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"sent6:"</span><span class="p">,</span> <span class="s2">" "</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">sent6</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"sent7:"</span><span class="p">,</span> <span class="s2">" "</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">sent7</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"sent8:"</span><span class="p">,</span> <span class="s2">" "</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">sent8</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"sent9:"</span><span class="p">,</span> <span class="s2">" "</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">sent9</span><span class="p">))</span></div>
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