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Python入门指南.pdf

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PythonTutorialPython\€HRelease2.5b2GuidovanRossumFredL.Drake,Jr.,editor11thJuly,2006PythonSoftwareFoundationEmail:docs@python.orgCopyright©2001-2006PythonSoftwareFoundation.Allrightsreserved.Copyright©2000BeOpen.com.Allrightsreserved.Copyright©1995-2000CorporationforNationalResearchInitiatives.Allrightsreserved.Copyright©1991-1995StichtingMathematischCentrum.Allrightsreserved.Seetheendofthisdocumentforcompletelicenseandpermissionsinformation.AbstractPythonisaneasytolearn,powerfulprogramminglanguage.Ithasefficienthigh-leveldatastructuresandasimplebuteffectiveapproachtoobject-orientedprogramming.Python’selegantsyntaxanddynamictyping,togetherwithitsinterpretednature,makeitanideallanguageforscriptingandrapidapplicationdevelopmentinmanyareasonmostplatforms.Python´˜«N´ÆSrŒ?§Šó"§¹p¨p?êâ(¨§U^{üp¨ª?1¡•é–?§"Python`äŠ{ÚÄa.§±9§U,)ºU姦٤Œõê²þ2·^uˆ+nŽŠóÚmu‚¸"ThePythoninterpreterandtheextensivestandardlibraryarefreelyavailableinsourceorbinaryformforallmajorplatformsfromthePythonWebsite,http://www.python.org/,andmaybefreelydistributed.ThesamesitealsocontainsdistributionsofandpointerstomanyfreethirdpartyPythonmodules,programsandtools,andadditionaldocumentation.Python)ºì9Ù*ÐIO¥èÚ?ȇŒ±lPythonWebÕ:,http://www.python.org/,9Ù¤kº”Õþ¤¼§¿…Œ±gduÙ"TÕ:þJøPython˜1n¬§§S§ó䧱9N\©"ThePythoninterpreteriseasilyextendedwithnewfunctionsanddatatypesimplementedinCorC++(orotherlanguagescallablefromC).Pythonisalsosuitableasanextensionlanguageforcustomizableapplications.Python)ºìŒ±éN´ÏLC½öC++£½öÙ§Œ±ÏLCN^Šó¤*Ð#¼êÚêâa."PythonŒ±Š½›A^*Њó"ThistutorialintroducesthereaderinformallytothebasicconceptsandfeaturesofthePythonlanguageandsystem.IthelpstohaveaPythoninterpreterhandyforhands-onexperience,butallexamplesareself-contained,sothetutorialcanbereadoff-lineaswell.Ãþ•Öö0PythonŠó9ÙXÚÄ£†Vg"ÜPython)ºìÆS¬ékÏ§ØL¤k~fÑ®)3©¥§¤±ùÃþéŒ±l‚Ö"Foradescriptionofstandardobjectsandmodules,seethePythonLibraryReferencedocument.ThePythonRefer-enceManualgivesamoreformaldefinitionofthelanguage.To