[Allen_B._Downey]_Think_Python_An_Introduction_to(BookFi.org)

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1、ThinkPythonHowtoThinkLikeaComputerScientistVersion1.1.19ThinkPythonHowtoThinkLikeaComputerScientistVersion1.1.19AllenDowneyGreenTeaPressNeedham,MassachusettsCopyright©2008AllenDowney.Printinghistory:April2002:FirsteditionofHowtoThinkLikeaComputerScientist.August2007:Major

2、revision,changedtitletoHowtoThinkLikea(Python)Programmer.June2008:Majorrevision,changedtitletoThinkPython:HowtoThinkLikeaComputerScientist.GreenTeaPress9WashburnAveNeedhamMA02492Permissionisgrantedtocopy,distribute,and/ormodifythisdocumentunderthetermsoftheGNUFreeDoc-umen

3、tationLicense,Version1.1oranylaterversionpublishedbytheFreeSoftwareFoundation;withnoInvariantSections,noFront-CoverTexts,andwithnoBack-CoverTexts.TheGNUFreeDocumentationLicenseisavailablefromwww.gnu.orgorbywritingtotheFreeSoftwareFoundation,Inc.,59TemplePlace,Suite330,Bos

4、ton,MA02111-1307,USA.TheoriginalformofthisbookisLATEXsourcecode.CompilingthisLATEXsourcehastheeffectofgeneratingadevice-independentrepresentationofatextbook,whichcanbeconvertedtootherformatsandprinted.TheLATEXsourceforthisbookisavailablefromhttp://www.thinkpython.comPrefa

5、ceThestrangehistoryofthisbookInJanuary1999IwaspreparingtoteachanintroductoryprogrammingclassinJava.IhadtaughtitthreetimesandIwasgettingfrustrated.Thefailurerateintheclasswastoohighand,evenforstudentswhosucceeded,theoveralllevelofachievementwastoolow.OneoftheproblemsIsawwa

6、sthebooks.Theyweretoobig,withtoomuchunnecessarydetailaboutJava,andnotenoughhigh-levelguidanceabouthowtoprogram.Andtheyallsufferedfromthetrapdooreffect:theywouldstartouteasy,proceedgradually,andthensomewherearoundChapter5thebottomwouldfallout.Thestudentswouldgettoomuchnewm

7、aterial,toofast,andIwouldspendtherestofthesemesterpickingupthepieces.Twoweeksbeforethefirstdayofclasses,Idecidedtowritemyownbook.Mygoalswere:Keepitshort.Itisbetterforstudentstoread10pagesthannotread50pages.Becarefulwithvocabulary.Itriedtominimizethejargonanddefineeachtermat

8、firstuse.Buildgradually.Toavoidtrapdoors,Itookthemostdifficulttopicsandsplitthemintoaseriesofsmall