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1、THIRDEDITIONPythonCookbookDavidBeazleyandBrianK.JonesPythonCookbook,ThirdEditionbyDavidBeazleyandBrianK.JonesCopyright©2013DavidBeazleyandBrianJones.Allrightsreserved.PrintedintheUnitedStatesofAmerica.PublishedbyO’ReillyMedia,Inc.,1005GravensteinHighwayNorth,Sebastopol,CA95472.O’Reill
2、ybooksmaybepurchasedforeducational,business,orsalespromotionaluse.Onlineeditionsarealsoavailableformosttitles(http://my.safaribooksonline.com).Formoreinformation,contactourcorporate/institutionalsalesdepartment:800-998-9938orcorporate@oreilly.com.Editors:MeghanBlanchetteandRachelRoume
3、liotisIndexer:WordCoIndexingServicesProductionEditor:KristenBorgCoverDesigner:KarenMontgomeryCopyeditor:JasmineKwitynInteriorDesigner:DavidFutatoProofreader:BIMProofreadingServicesIllustrator:RobertRomanoMay2013:ThirdEditionRevisionHistoryfortheThirdEdition:2013-05-08:FirstreleaseSeeh
4、ttp://oreilly.com/catalog/errata.csp?isbn=9781449340377forreleasedetails.NutshellHandbook,theNutshellHandbooklogo,andtheO’ReillylogoareregisteredtrademarksofO’ReillyMedia,Inc.PythonCookbook,theimageofaspringhaas,andrelatedtradedressaretrademarksofO’ReillyMedia,Inc.Manyofthedesignation
5、susedbymanufacturersandsellerstodistinguishtheirproductsareclaimedastrademarks.Wherethosedesignationsappearinthisbook,andO’ReillyMedia,Inc.,wasawareofatrade‐markclaim,thedesignationshavebeenprintedincapsorinitialcaps.Whileeveryprecautionhasbeentakeninthepreparationofthisbook,thepublis
6、herandauthorsassumenoresponsibilityforerrorsoromissions,orfordamagesresultingfromtheuseoftheinformationcontainedherein.ISBN:978-1-449-34037-7[LSI]TableofContentsPreface.......................................................................xi1.DataStructuresandAlgorithms...............
7、................................11.1.UnpackingaSequenceintoSeparateVariables11.2.UnpackingElementsfromIterablesofArbitraryLength31.3.KeepingtheLastNItems51.4.FindingtheLargestorSmallestNItems71.5.ImplementingaPriorityQueue81.6.MappingKeystoMultipleValuesinaDictionary111.7.KeepingDicti
8、onari
