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In-Depth Python OOP

@property

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@property is a decorator that modifies the method inside a class to the class property.

To create the property, you should create a method with the @property decorator above.


              
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class CinemaHall:
    def __init__(self, rows, seats_in_row):
        self.rows = rows
        self.seats_in_row = seats_in_row

    @property
    def capacity(self):
        return self.rows * self.seats_in_row

hall = CinemaHall(24, 12)
print(hall.capacity)

hall.rows = 5
hall.seats_in_row = 11
print(hall.capacity)

In the example above, you can see a cinema hall that has attributes rows and seats_in_row. The capacity property returns the total number of seats in the hall. It wouldn't make sense to create a separate attribute capacity because if we change the number of rows, we would have conflicting values. Specifically, no actions are performed with the class; only one of the hall's properties is returned.

Properties should have a specific logic: they should return a certain attribute of the class, unlike methods that are used to perform specific actions with the class.

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How to define a new property?

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Sektion 3. Kapitel 7

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@property

@property is a decorator that modifies the method inside a class to the class property.

To create the property, you should create a method with the @property decorator above.


              
123456789101112131415

            
class CinemaHall:
    def __init__(self, rows, seats_in_row):
        self.rows = rows
        self.seats_in_row = seats_in_row

    @property
    def capacity(self):
        return self.rows * self.seats_in_row

hall = CinemaHall(24, 12)
print(hall.capacity)

hall.rows = 5
hall.seats_in_row = 11
print(hall.capacity)

In the example above, you can see a cinema hall that has attributes rows and seats_in_row. The capacity property returns the total number of seats in the hall. It wouldn't make sense to create a separate attribute capacity because if we change the number of rows, we would have conflicting values. Specifically, no actions are performed with the class; only one of the hall's properties is returned.

Properties should have a specific logic: they should return a certain attribute of the class, unlike methods that are used to perform specific actions with the class.

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 3. Kapitel 7
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