Python property() function - GeeksforGeeks

Python property() function ... Python property() function returns the object of the property class and it is used to create property of a class. 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SaveArticle LikeArticle Pythonproperty()functionDifficultyLevel: ExpertLastUpdated: 23Sep,2021Pythonproperty()functionreturnstheobjectofthepropertyclassanditisusedtocreatepropertyofaclass. Syntax:property(fget,fset,fdel,doc)Parameters: fget()–usedtogetthevalueofattributefset()–usedtosetthevalueofattributefdel()–usedtodeletetheattributevaluedoc()–stringthatcontainsthedocumentation(docstring)fortheattributeReturn:Returnsapropertyattributefromthegivengetter,setteranddeleter.Note: Ifnoargumentsaregiven,property()methodreturnsabasepropertyattributethatdoesn’tcontainanygetter,setterordeleter.Ifdocisn’tprovided,property()methodtakesthedocstringofthegetterfunction.Example#1:Usingproperty()method Python3#Pythonprogramtoexplainproperty()function#Alphabetclass classAlphabet:    def__init__(self,value):        self._value=value     #gettingthevalues    defgetValue(self):        print('Gettingvalue')        returnself._value     #settingthevalues    defsetValue(self,value):        print('Settingvalueto'+value)        self._value=value     #deletingthevalues    defdelValue(self):        print('Deletingvalue')        delself._value     value=property(getValue,setValue,                     delValue,)  #passingthevaluex=Alphabet('GeeksforGeeks')print(x.value) x.value='GfG' delx.valueOutput: Gettingvalue GeeksforGeeks SettingvaluetoGfG DeletingvaluePythonpropertyUsingDecoratorThemainworkofdecoratorsistheyareusedtoaddfunctionalitytotheexistingcode.Alsocalledmetaprogramming,asapartoftheprogramtriestomodifyanotherpartoftheprogramatcompiletime.Example#2:Using@propertydecoratorPython3#Pythonprogramtoexplainproperty()#functionusingdecorator classAlphabet:    def__init__(self,value):        self._value=value     #gettingthevalues    @property    defvalue(self):        print('Gettingvalue')        returnself._value     #settingthevalues    @value.setter    defvalue(self,value):        print('Settingvalueto'+value)        self._value=value     #deletingthevalues    @value.deleter    defvalue(self):        print('Deletingvalue')        delself._value  #passingthevaluex=Alphabet('Peter')print(x.value) x.value='Diesel' delx.valueOutput: Gettingvalue Peter SettingvaluetoDiesel DeletingvalueUsing@propertydecoratorworkssameasproperty()method.First,specifythatvalue()methodisalsoanattributeofAlphabetthen,weusetheattributevaluetospecifythePythonpropertysetterandthedeleter.Noticethatthesamemethodvalue()isusedwithdifferentdefinitionsfordefiningthegetter,setter,anddeleter.Wheneverweusex.value,itinternallycallstheappropriategetter,setter,anddeleter.PythonpropertyvsattributeClassAttribute:ClassAttributesareuniquetoeachclass.Eachinstanceoftheclasswillhavethisattribute. Python3#declareaclassclassEmployee:     #classattribute    count=0     #defineamethod    defincrease(self):        Employee.count+=1 #createanEmployee#classobjecta1=Employee() #callingobject'smethoda1.increase() #printvalueofclassattributeprint(a1.count) a2=Employee() a2.increase() print(a2.count) print(Employee.count)Output:1 2 2Intheaboveexample,thecountvariableisaclassattribute.Pythonproperty():Returnsobjectofthepropertyclass Python3#createaclassclassgfg:         #constructor    def__init__(self,value):        self._value=value                 #gettingthevalues    defgetter(self):        print('Gettingvalue')        returnself._value                 #settingthevalues    defsetter(self,value):        print('Settingvalueto'+value)        self._value=value                 #deletingthevalues    defdeleter(self):        print('Deletingvalue')        delself._value         #createaproperties    value=property(getter,setter,deleter,)     #createagfgclassobjectx=gfg('HappyCoding!')print(x.value)     x.value='HeyCoder!'     #deletingthevaluedelx.valueOutput:Gettingvalue HappyCoding! SettingvaluetoHeyCoder! DeletingvalueApplicationsByusingproperty()method,wecanmodifyourclassandimplementthevalueconstraintwithoutanychangerequiredtotheclientcode.Sothattheimplementationisbackwardcompatible.MyPersonalNotes arrow_drop_upSave LikePreviousPythonPropertyDecorator-@propertyNext GetterandSetterinPythonRecommendedArticlesPage:10,Mar2027,Apr2001,Sep2004,Dec1927,Apr2005,May2002,Jun2004,May1615,May1610,May1722,Jun1710,Jan1803,Apr1910,Jan1828,Oct1722,Nov1724,Nov1725,Nov1725,Nov1730,Nov1712,Dec1713,Dec1713,Dec1723,Dec17ArticleContributedBy:shubhamtyagi4@shubhamtyagi4VotefordifficultyCurrentdifficulty: ExpertEasy Normal Medium Hard ExpertImprovedBy:shubham_singhkumar_satyamArticleTags:Python-FunctionsPythonReportIssueWritingcodeincomment? Pleaseuseide.geeksforgeeks.org, generatelinkandsharethelinkhere. 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