What's the pythonic way to use getters and setters?

Question

I\'m doing it like:

def set_property(property,value):  
def get_property(property):  

or

object.property = value  
value =         


        

Answer 1

This is an old question but the topic is very important and always current. In case anyone wants to go beyond simple getters/setters i have wrote an article about superpowered properties in python with support for slots, observability and reduced boilerplate code.

from objects import properties, self_properties


class Car:
    with properties(locals(), 'meta') as meta:

        @meta.prop(read_only=True)
        def brand(self) -> str:
            """Brand"""

        @meta.prop(read_only=True)
        def max_speed(self) -> float:
            """Maximum car speed"""

        @meta.prop(listener='_on_acceleration')
        def speed(self) -> float:
            """Speed of the car"""
            return 0  # Default stopped

        @meta.prop(listener='_on_off_listener')
        def on(self) -> bool:
            """Engine state"""
            return False

    def __init__(self, brand: str, max_speed: float = 200):
        self_properties(self, locals())

    def _on_off_listener(self, prop, old, on):
        if on:
            print(f"{self.brand} Turned on, Runnnnnn")
        else:
            self._speed = 0
            print(f"{self.brand} Turned off.")

    def _on_acceleration(self, prop, old, speed):
        if self.on:
            if speed > self.max_speed:
                print(f"{self.brand} {speed}km/h Bang! Engine exploded!")
                self.on = False
            else:
                print(f"{self.brand} New speed: {speed}km/h")
        else:
            print(f"{self.brand} Car is off, no speed change")

This class can be used like this:

mycar = Car('Ford')

# Car is turned off
for speed in range(0, 300, 50):
    mycar.speed = speed

# Car is turned on
mycar.on = True
for speed in range(0, 350, 50):
    mycar.speed = speed

This code will produce the following output:

Ford Car is off, no speed change
Ford Car is off, no speed change
Ford Car is off, no speed change
Ford Car is off, no speed change
Ford Car is off, no speed change
Ford Car is off, no speed change
Ford Turned on, Runnnnnn
Ford New speed: 0km/h
Ford New speed: 50km/h
Ford New speed: 100km/h
Ford New speed: 150km/h
Ford New speed: 200km/h
Ford 250km/h Bang! Engine exploded!
Ford Turned off.
Ford Car is off, no speed change

More info about how and why here: https://mnesarco.github.io/blog/2020/07/23/python-metaprogramming-properties-on-steroids