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1、NaturalLanguageProcessingwithPythonStevenBird,EwanKlein,andEdwardLoperBeijing•Cambridge•Farnham•Köln•Sebastopol•Taipei•TokyoNaturalLanguageProcessingwithPythonbyStevenBird,EwanKlein,andEdwardLoperCopyright©2009StevenBird,EwanKlein,andEdwardLoper.Allrightsreserved.PrintedintheUnitedSt
2、atesofAmerica.PublishedbyO’ReillyMedia,Inc.,1005GravensteinHighwayNorth,Sebastopol,CA95472.O’Reillybooksmaybepurchasedforeducational,business,orsalespromotionaluse.Onlineeditionsarealsoavailableformosttitles(http://my.safaribooksonline.com).Formoreinformation,contactourcorporate/inst
3、itutionalsalesdepartment:(800)998-9938orcorporate@oreilly.com.Editor:JulieSteeleIndexer:EllenTroutmanZaigProductionEditor:LoranahDimantCoverDesigner:KarenMontgomeryCopyeditor:Genevieved’EntremontInteriorDesigner:DavidFutatoProofreader:LoranahDimantIllustrator:RobertRomanoPrintingHist
4、ory:June2009:FirstEdition.NutshellHandbook,theNutshellHandbooklogo,andtheO’ReillylogoareregisteredtrademarksofO’ReillyMedia,Inc.NaturalLanguageProcessingwithPython,theimageofarightwhale,andrelatedtradedressaretrademarksofO’ReillyMedia,Inc.Manyofthedesignationsusedbymanufacturersandse
5、llerstodistinguishtheirproductsareclaimedastrademarks.Wherethosedesignationsappearinthisbook,andO’ReillyMedia,Inc.wasawareofatrademarkclaim,thedesignationshavebeenprintedincapsorinitialcaps.Whileeveryprecautionhasbeentakeninthepreparationofthisbook,thepublisherandauthorsassumenorespo
6、nsibilityforerrorsoromissions,orfordamagesresultingfromtheuseoftheinformationcon-tainedherein.ISBN:978-0-596-51649-9[M]1244726609TableofContentsPreface.....................................................................ix1.LanguageProcessingandPython.................................
7、.........11.1ComputingwithLanguage:TextsandWords11.2ACloserLookatPython:TextsasListsofWords101.3ComputingwithLanguage:SimpleStatistics161.4BacktoPython:MakingDecisionsandTakingControl221.5AutomaticNaturalLanguageUnderstanding271.6Summary331.7FurtherReading341.8Exercises352.AccessingT
8、extCorporaan