nesting

2learningtasksCreatespecialnestingandparse.3KnowledgeobjectivesUnderstandtheconceptofnestingMastertheimplementationandanalysisofnesting01CapabilityobjectivesBeabletonestaccordingtoactualneedsCananalyzenestedstructure02Learningobjectives4nestingconceptSometimes,youneedtostoreaseriesofdictionariesinalist,oralistasavalueinadictionary,whichiscallednesting.InPython,listsanddictionariescanbenestedinmanyways,suchasnestingdictionariesinlists,nestinglistsindictionaries,andsoon.5nestingHomotypenestingInpractice,itisnecessarytonestlists,dictionariesanddictionaries.Atthistime,youonlyneedtoaddthecurrentlist(ordictionary)asawholetotheouterlist(ordictionary).Whenparsing,useforlooptosplitlayerbylayerfromoutsidetoinside.6example：Homotypenesting7nestingHeteromorphicnestingSometimesyouneedtostorealistinadictionary,oradictionaryinalist.Atthistime,youonlyneedtoaddthecurrentlist(ordictionary)asawholetotheouterDictionary(orlist).However,itshouldbenotedthatthekeyofthedictionaryisimmutable,sothelistcannotbenestedasakey.Whenparsing,useforlooptosplitlayerbylayerfromoutsidetoinside.8nestingMultiplenestingWhenusingtheforlooptoresolvemultiplenestedstructures,youcanusetheisinstance()functiontodeterminewhetherthecurrentobjectisofaniterativetypeforthenextlevelofparsing,otherwisedirectlyoutputthecurrentlyresolvedvalue.9functionisinstance()Isinstance()functiontodeterminewhetheranobjectisaknowntype,similartotype().Syntax:isinstance(object,classInfo)Parameter:object--instanceobject.ClassInfo--canbeadirectorindirectclassname,abasetype,oratupleofthem.Returnvalue:returnstrueiftheobject'stypeisthesameastheparameter'stype,otherwisefalse.10Example:multiplenesting.11Taskimplementation12Operationdemonstration13SummaryofknowledgepointsThe