deleter decorator using Property in Python - Stack Overflow

I'm playing around with property in Python and I was wondering how this @propertyName.deleter decorator works. Home Public Questions Tags Users Collectives ExploreCollectives FindaJob Jobs Companies Teams StackOverflowforTeams –Collaborateandshareknowledgewithaprivategroup. CreateafreeTeam WhatisTeams? Teams CreatefreeTeam CollectivesonStackOverflow Findcentralized,trustedcontentandcollaboratearoundthetechnologiesyouusemost. Learnmore Teams Q&Aforwork Connectandshareknowledgewithinasinglelocationthatisstructuredandeasytosearch. Learnmore deleterdecoratorusingPropertyinPython AskQuestion Asked 12years,3monthsago Modified 12years,3monthsago Viewed 13ktimes 16 2 I'mplayingaroundwithpropertyinPythonandIwaswonderinghowthis@propertyName.deleterdecoratorworks.I'mprobablymissingsomething,IcouldnotfindclearanswersbyGoogle. WhatIwouldliketoachieveiswhenthisdeleterbehavioriscalled,Icantriggerotheractions(e.g:usingmy3dapplicationSDK). Fornowjustasimpleprint()doesn'tseemtogettriggered. IsdeleterfiredwhenIdeletethepropertyusingdel(instance.property)? Otherwise,howcanIachievethis? classM(): def__init__(self): self._m=None @property defmmm(self): returnself._m @mmm.setter defmmm(self,val): self._m=val @mmm.deleter defmmm(self): print('deleting')#Notprinting del(self._m) if__name__=='__main__': i=M() i.mmm=150 print(i.mmm) del(i.mmm) print(i.mmm) Thankyouverymuch(: pythonpropertiesdecorator Share Follow askedDec16,2009at4:11 user111086user111086 Addacomment  |  2Answers 2 Sortedby: Resettodefault Highestscore(default) Datemodified(newestfirst) Datecreated(oldestfirst) 14 MakeManew-styleclass: classM(object): Seehttp://www.python.org/download/releases/2.2.3/descrintro/#property: Propertiesdonotworkforclassic classes,butyoudon'tgetaclear errorwhenyoutrythis.Yourget methodwillbecalled,soitappears towork,butuponattribute assignment,aclassicclassinstance willsimplysetthevalueinits dictwithoutcallingtheproperty'ssetmethod,andafterthat, theproperty'sgetmethodwon'tbe calledeither.(Youcouldoverride setattrtofixthis,butitwouldbeprohibitivelyexpensive.) Share Follow answeredDec16,2009at4:16 unutbuunutbu 765k160160goldbadges16791679silverbadges16011601bronzebadges 0 Addacomment  |  9 InPython3youWOULDseetheprint'sresult--andthenanAttributeErrorforthelastprint(because_mhasdisappeared).YoumaybeusingPython2.6,inwhichcaseyouneedtochangetheclassclausetoclassM(object):tomakeMnew-style,andthenyou'llgetthesamebehaviorasinPython3. Share Follow answeredDec16,2009at4:21 AlexMartelliAlexMartelli 803k161161goldbadges11911191silverbadges13651365bronzebadges 0 Addacomment  |  YourAnswer ThanksforcontributingananswertoStackOverflow!Pleasebesuretoanswerthequestion.Providedetailsandshareyourresearch!Butavoid…Askingforhelp,clarification,orrespondingtootheranswers.Makingstatementsbasedonopinion;backthemupwithreferencesorpersonalexperience.Tolearnmore,seeourtipsonwritinggreatanswers. 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