python data analysis pandas primer

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1、pandasPrimerpandasisnamedafterpaneldata(aneconometricterm)andPythondataanalysis,andisapopularopensourcePythonproject.Thischapterisatutorialonbasicpandasfunctionalities,wherewewilllearnaboutpandasdatastructuresandoperations.Theofficialpandasdocumentationinsistsonnamingtheprojectpandasinalllowerca

2、seletters.Theotherconventiontheyinsistonisthisimportstatement:importpandasaspd.Wewilltrytofollowtheseconventionsasmuchaspossible.Inthischapter,wewillinstallandexplorepandas.Then,wewillacquaintourselveswiththetwocentralpandasdatastructures:DataFrameandSeries.Afterthis,youwilllearnhowtoperformSQL-

3、likeoperationsonthedatacontainedinthesedatastructures.pandashasstatisticalutilitiesincludingtime-seriesroutines,someofwhichwillbedemonstrated.Thetopicswewillpursueareasfollows:•Installingandexploringpandas•DataFrameandSeriesdatastructures•Queryingdatainpandas•StatisticswithpandasDataFrames•Dataa

4、ggregationwithpandasDataFrames•Concatenating,joining,andappendingDataFrames•Handlingmissingvalues•Dealingwithdates•Pivottables•RemotedataaccesspandasPrimerInstallingandexploringpandasTheminimaldependencysetrequirementsforpandasisgivenasfollows:•NumPy:Thisisthefundamentalnumericalarraypackagethat

5、weinstalledandcoveredextensivelyintheprecedingchapters•python-dateutil:Thisisadate-handlinglibrary•pytz:ThishandlestimezonedefinitionsThislististhebareminimum;alongerlistofoptionaldependenciescanbelocatedathttp://pandas.pydata.org/pandas-docs/stable/install.html.WecaninstallpandasviaPyPIwithpipo

6、reasy_install,usingabinaryinstaller,withtheaidofouroperatingsystempackagemanager,orfromthesourcebycheckingoutthecode.Thebinaryinstallerscanbedownloadedfromhttp://pandas.pydata.org/getpandas.html.Thecommandtoinstallpandaswithpipisasfollows:$pipinstallpandasYoumayhavetoprependtheprecedingcommandwi

7、thsudoifyouruseraccountdoesn'thavesufficientrights.Formost,ifnotall,Linuxdistributions,thepandaspackagenameispython-pandas.Pleaserefertothemanualpagesofyourpackagemanagerforthecorrectcommandtoinstall.Thesecommandsshouldbethe