Implementing Property Setters in Python

This challenge focuses on creating custom property setters in Python using the @property decorator. Property setters allow you to control how attributes are assigned to an object, enabling validation, side effects, or other logic during the assignment process. This is a fundamental concept for building robust and maintainable object-oriented code.

Problem Description

You are tasked with creating a Rectangle class that has a width and height attribute. You need to implement property setters for both width and height that enforce the following constraints:

• Both width and height must be positive numbers (greater than 0).
• If a non-positive value is provided, raise a ValueError with a descriptive message.
• The setters should store the validated values internally.

The class should also have a get_area method that calculates and returns the area of the rectangle (width * height).

Key Requirements:

• Use the @property decorator to define the width and height attributes as properties.
• Implement setter methods for width and height that perform validation.
• Raise a ValueError if validation fails.
• The get_area method should correctly calculate the area using the validated width and height.

Expected Behavior:

When a new Rectangle object is created, setting width or height should trigger the setter methods. If the provided value is valid, it should be stored. If the value is invalid, a ValueError should be raised. The get_area method should return the correct area based on the stored width and height.

Edge Cases to Consider:

• Setting width or height to 0.
• Setting width or height to negative numbers.
• Setting width or height to non-numeric values (e.g., strings). While the problem doesn't explicitly require handling non-numeric types, consider how your solution would behave.

Examples

Example 1:

Input:
rect = Rectangle(5, 10)
rect.width = -2
Output:
ValueError: Width must be a positive number.

Explanation: Attempting to set the width to a negative value raises a ValueError as expected.

Example 2:

Input:
rect = Rectangle(5, 10)
rect.height = 8
print(rect.width)
print(rect.height)
print(rect.get_area())
Output:
5
8
40

Explanation: Setting the height to a valid value (8) updates the height attribute, and the area is correctly calculated as 40.

Example 3:

Input:
rect = Rectangle(5, 10)
try:
    rect.width = 0
except ValueError as e:
    print(e)
Output:
Width must be a positive number.

Explanation: Setting the width to 0 raises a ValueError because 0 is not a positive number.

Constraints

• The width and height attributes must be numeric (int or float).
• The width and height must be greater than 0.
• The Rectangle class must be defined.
• The code must be valid Python 3.
• The solution should be concise and readable.

Notes

• The @property decorator is key to creating properties.
• Remember to define both the getter and setter methods for each property.
• Use raise ValueError("Descriptive message") to signal invalid input.
• Consider using type checking (although not strictly required) to improve robustness.