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1、NaturalLanguageProcessingwithPythonNaturalLanguageProcessingwithPythonStevenBird,EwanKlein,andEdwardLoperBeijing•Cambridge•Farnham•Köln•Sebastopol•Taipei•TokyoNaturalLanguageProcessingwithPythonbyStevenBird,EwanKlein,andEdwardLoperCopyright©2009StevenBird,EwanKlein,andEdwardLoper.Allrightsreserv
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3、porate/institutionalsalesdepartment:(800)998-9938orcorporate@oreilly.com.Editor:JulieSteeleIndexer:EllenTroutmanZaigProductionEditor:LoranahDimantCoverDesigner:KarenMontgomeryCopyeditor:Genevieved’EntremontInteriorDesigner:DavidFutatoProofreader:LoranahDimantIllustrator:RobertRomanoPrintingHisto
4、ry:June2009:FirstEdition.NutshellHandbook,theNutshellHandbooklogo,andtheO’ReillylogoareregisteredtrademarksofO’ReillyMedia,Inc.NaturalLanguageProcessingwithPython,theimageofarightwhale,andrelatedtradedressaretrademarksofO’ReillyMedia,Inc.Manyofthedesignationsusedbymanufacturersandsellerstodistin
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6、ions,orfordamagesresultingfromtheuseoftheinformationcon-tainedherein.ISBN:978-0-596-51649-9[M]1244726609TableofContentsPreface.....................................................................ix1.LanguageProcessingandPython..........................................11.1ComputingwithLanguage:Te
7、xtsandWords11.2ACloserLookatPython:TextsasListsofWords101.3ComputingwithLanguage:SimpleStatistics161.4BacktoPython:MakingDecisionsandTakingControl221.5AutomaticNaturalLanguageUnderstanding271.6Summary331.7FurtherReading341.8
