Python class optional argumentsPython pass class as argumentPython class method as argumentPython pass class object as argumentPython function parameter class objectself in Python class - GeeksforGeeks
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Self is the first argument to be passed in Constructor and Instance Method. Self must be provided as a First parameter to the Instance method ...
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selfrepresentstheinstanceoftheclass.Byusingthe“self” wecanaccesstheattributesandmethodsoftheclassinpython.Itbindstheattributeswiththegivenarguments.Thereasonyouneedtouseself.isbecausePythondoesnotusethe@syntaxtorefertoinstanceattributes.Pythondecidedtodomethodsinawaythatmakestheinstancetowhichthemethodbelongsbepassedautomatically,butnotreceivedautomatically:thefirstparameterofmethodsistheinstancethemethodiscalledon.InmoreclearwayyoucansaythatSELFhasfollowingCharacteristic-SelfisalwayspointingtoCurrentObject.Python3#itisclearlyseenthatselfandobjisreferringtothesameobject classcheck: def__init__(self): print("Addressofself=",id(self)) obj=check()print("Addressofclassobject=",id(obj)) #thiscodeisContributedbySamyakJainOutputAddressofself=140124194801032
Addressofclassobject=140124194801032AnotherExampleofUsingSELF:Python3#WritePython3codehere classcar(): #initmethodorconstructor def__init__(self,model,color): self.model=model self.color=color defshow(self): print("Modelis",self.model) print("coloris",self.color) #bothobjectshavedifferentselfwhich#containtheirattributesaudi=car("audia4","blue")ferrari=car("ferrari488","green") audi.show() #sameoutputascar.show(audi)ferrari.show() #sameoutputascar.show(ferrari) #Behindthescene,ineveryinstancemethod#call,pythonsendstheinstancesalsowith#thatmethodcalllikecar.show(audi)OutputModelisaudia4
colorisblue
Modelisferrari488
colorisgreenSelfisthefirstargumenttobepassedinConstructorandInstanceMethod.SelfmustbeprovidedasaFirstparametertotheInstancemethodandconstructor.Ifyoudon’tprovideit,itwillcauseanerror.Python3#Selfisalwaysrequiredasthefirstargumentclasscheck: def__init__(): print("ThisisConstructor") object=check()print("Workedfine") #FollowingErrorisproducedifSelfisnotpassedasanargumentTraceback(mostrecentcalllast): File"/home/c736b5fad311dd1eb3cd2e280260e7dd.py",line6,in
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