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1、Morefreeebooks:http://fast-file.blogspot.comPythonPocketReferenceMorefreeebooks:http://fast-file.blogspot.comMorefreeebooks:http://fast-file.blogspot.comFOURTHEDITIONPythonPocketReferenceMarkLutzBeijing•Cambridge•Farnham•Köln•Sebastopol•Taipei•TokyoMorefreeebooks:http://fast-file.blogspot
2、.comPythonPocketReference,FourthEditionbyMarkLutzCopyright©2010MarkLutz.Allrightsreserved.PrintedinCanada.PublishedbyO’ReillyMedia,Inc.,1005GravensteinHighwayNorth,Se-bastopol,CA95472.O’Reillybooksmaybepurchasedforeducational,business,orsalespromo-tionaluse.Onlineeditionsarealsoavailablef
3、ormosttitles(http://my.safaribooksonline.com).Formoreinformation,contactourcorporate/institutionalsalesdepartment:(800)998-9938orcorporate@oreilly.com.Editor:JulieSteeleProductionEditor:SumitaMukherjiProofreader:KielVanHornIndexer:JohnBickelhauptCoverDesigner:KarenMontgomeryInteriorDesign
4、er:DavidFutatoPrintingHistory:October1998:FirstEdition.January2002:SecondEdition.February2005:ThirdEdition.October2009:FourthEdition.NutshellHandbook,theNutshellHandbooklogo,andtheO’ReillylogoareregisteredtrademarksofO’ReillyMedia,Inc.ThePocketReferenceseriesdesignations,PythonPocketRefer
5、ence,theimageofarockpython,andre-latedtradedressaretrademarksofO’ReillyMedia,Inc.Manyofthedesignationsusedbymanufacturersandsellerstodistinguishtheirproductsareclaimedastrademarks.Wherethosedesignationsappearinthisbook,andO’ReillyMedia,Inc.,wasawareofatrademarkclaim,thedesignationshavebee
6、nprintedincapsorinitialcaps.Whileeveryprecautionhasbeentakeninthepreparationofthisbook,thepublisherandauthorassumenoresponsibilityforerrorsoromissions,orfordamagesresultingfromtheuseoftheinformationcontainedherein.ISBN:978-0-596-15808-8[TM]1253806016Morefreeebooks:http://fast-file.blogspo
7、t.comContentsPythonPocketReference1Introduction1Conventions2Command-LineOptions4PythonOptions4ProgramSpecification6EnvironmentVariables7OperationalVariables7Command-LineOptionVariables8Built-inTypesandOperators8OperatorsandPrecedence8OperatorUsageNotes10Operationsby
