Attributes Annotations
Using annotations starting with @
symbol is a special way to define properties.
- Write
@property
to defineget()
method; - Write
@attribute.setter
to define theset()
method for the attribute.
We need to do that to explain to Python what these methods are going to be used for.
1234567891011121314151617181920212223class Cat: def __init__(self, name = 'Kitty', age = 1): self.name = name self.__age = age self.__number_of_legs = 4 @property def age(self): return self.__age @age.setter def age(self, age): if isinstance(age, int) and 0<=age<=30: self.__age = age else: print('Invalid value of attribute age') cat = Cat('Maggie', 3) # Adding the wrong value cat.age = -100 cat.age = 5 print(cat.age)
Note
- First, define getter
@property
and after that β setter@attribute.setter
; - Both methods have the same name, that is equal to the attribute name;
- Now, to access the private attribute
__age
outside the class, you can use thecat.age
expression;
Everything was clear?
Thanks for your feedback!
SectionΒ 2. ChapterΒ 3
Ask AI
Ask AI
Ask anything or try one of the suggested questions to begin our chat
Awesome!
Completion rate improved to 7.69
Attributes Annotations
Swipe to show menu
Using annotations starting with @
symbol is a special way to define properties.
- Write
@property
to defineget()
method; - Write
@attribute.setter
to define theset()
method for the attribute.
We need to do that to explain to Python what these methods are going to be used for.
1234567891011121314151617181920212223class Cat: def __init__(self, name = 'Kitty', age = 1): self.name = name self.__age = age self.__number_of_legs = 4 @property def age(self): return self.__age @age.setter def age(self, age): if isinstance(age, int) and 0<=age<=30: self.__age = age else: print('Invalid value of attribute age') cat = Cat('Maggie', 3) # Adding the wrong value cat.age = -100 cat.age = 5 print(cat.age)
Note
- First, define getter
@property
and after that β setter@attribute.setter
; - Both methods have the same name, that is equal to the attribute name;
- Now, to access the private attribute
__age
outside the class, you can use thecat.age
expression;
Everything was clear?
Thanks for your feedback!
SectionΒ 2. ChapterΒ 3