@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.


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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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Section 3. Chapter 7

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In-Depth Python OOP