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pythonclassproperties
bryan tetris
bryan tetris

Reputation: 133

class property conversions

I have to use a class. I have to make sure that x and y are properties.

If the values ​​provided are not convertible to an integer, raise an AttributeError. If we give a value less than 0 to x or y, it is assigned the value 0.

If we give a value greater than 10 to x or y, it is assigned the value 10.

Here is my code:

class Point:
    def __init__(self, x, y):
        self.x = x
        self.y = y

    def getx(self):
        x=int()
        return self._x
    def gety(self):
        y=int()
        return self._y

        if x>=0:
            return 0
            else if x<=10:
                return 10

I want to obtain this:

p = Point(1,12)
print(p.x, p.y) # output "1 10"
p.x = 25
p.y = -5
print(p.x, p.y) # output "10 0"

Upvotes: 0

Views: 38

Answers (1)

Andrej Kesely
Andrej Kesely

Reputation: 195428

What are you looking for is clamp() function, which takes 3 arguments: value, desired minimal value and desired maximal value.

Properties are defined by the @property decorator. For testing if the value assigned to property is number I use numbers module. Here is sample code:

import numbers

def clamp(v, _min, _max):
    return max(min(v, _max), _min)

class Point:
    def __init__(self, x, y):
        self.x = x
        self.y = y

    @property
    def x(self):
        return self.__x

    @x.setter
    def x(self, value):
        if not isinstance(value, numbers.Number):
            raise AttributeError()
        self.__x = clamp(int(value), 0, 10)

    @property
    def y(self):
        return self.__y

    @y.setter
    def y(self, value):
        if not isinstance(value, numbers.Number):
            raise AttributeError()
        self.__y = clamp(int(value), 0, 10)

p = Point(1,12)
print(p.x, p.y) # output "1 10"
p.x = 25
p.y = -5
print(p.x, p.y) # output "10 0"

Upvotes: 2

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