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method2learningtasksGeneratesaninstanceobjectfromastring.3TheknowledgeobjectiveMasterthewritingmethodsofdifferentmethodsinPythonUnderstandtheapplicationscenariosofdifferentmethods01AbilityaimTheabilitytodefinelogicalstructuresforoptimizingcodeindifferentways02learningtarget4methodclassificationMethodisusedtodescribethebehaviorofanobject.Themethodsdefinedintheclasscanberoughlydividedintofourcategories:instancemethod，classmethod，staticmethodandmagicmethod.Similarly，methodscanberestrictedusingnamemodifiers.5methodCasemethodTheinstancemethodsofaclassneedatleastoneparameter(usuallyself)，andmustbethefirstparameterofthemethod.Whencalledexternally，thecallingobject(instance)isautomaticallypassedintothemethodasthefirstargument.Theformatofdefininganinstancemethodisasfollows:6methodClassmethodAclassmethodalsorequiresatleastoneparameter(usuallyCLS)，andmustbethefirstparameterofthemethod.Whencalledexternally，thecorrespondingclassisautomaticallypassedintothemethodasthefirstargument.Theformatofdefiningclassmethodsisasfollows(youneedtousethedecorator@classmethod):7methodStaticmethodStaticmethodshavenospecificparameterrestrictionsandneedtobedefinedwiththedecorator@staticmethod.Staticmethodscanbecalledwithclassesorinstances.Theformatofdefininginstancemethodsisasfollows:8methodExample1:definitioncallofinstancemethod9methodExample2:definitioncallofclassmethodandstaticmethod10methodApplicationscenarioGenerally，theinstancemethodcansolvealmostallproblems.Relativelyspeaking，classmethodsarelessused，andcanbeusedasfactorymethodstocreateinstanceobjects.BecausethestaticmethoddoesnotneedtopassinselforCLSparameters，itcannotdirectlyoperatethepropertiesandmethodsintheclass，thatis，itwillnotaffectthestateoftheclassorinstanceobject.Staticmethodscansavethecostofinstantiatingobjects.Itisnotaproblemtoputthismethodoutsidetheclassasafunction，butonlyforthecurrentclass.11methoddifference1.Definitionform:a.Classmethodsandstaticmethodsareimplementedbydecorators，butinstancemethodsarenot;b.Instancemethodneedstopassinselfparameter，classmethodneedstopassinCLSparameter，whilestaticmethoddoesn'tneedtopassinselforCLSparameter.12methoddifference2.Callingmethod:a.Instancemethodscanonlybecalledthroughinstanceobjects;b.Classmethodandstaticmethodcanbecalledbyclassobjectorinstanceobject.Iftheclassmethodorstaticmethodiscalledbyinstanceobject，itwilleventuallybecalledbyclassobject.13methoddifference3.Applicationscenario:a.Instancemethodisthemostwidelyusedmethod，whichcandirectlydealwiththelogicofinstanceobject;classmethoddoesnotneedtocreateinstanceobject，butdirectlydealswiththelogicofclassobject;staticmethodcanextractsomelogicrelatedtoclassobject，whichcannotonlybeusedfortesting，butalsoforlatermaintenanceofcode.b.Instancemethodandclassmethodcanchangethestateofinstanceobjectorclassobject，butstaticmethodcan't.14Taskimplementation15Operationdemo16Sum

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