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Add property getter setter validation in Python

Shows how to use @property with a setter to validate values before assigning them in a Python class.

class Temperature:
    def __init__(self, celsius=0):
        self._celsius = celsius  # Use underscore to avoid recursion
    
    @property
    def celsius(self):
        """Getter returns the stored value."""
        return self._celsius
    
    @celsius.setter
    def celsius(self, value):
        """Setter valid…

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