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Practice

Managing Object Attributes with Getters and Setters

In a class, getter and setter methods are used to access or modify the attributes of an object indirectly.

A getter is used to read a property's value, while a setter is used to set or modify a property's value.

In Python, you can implement getters and setters directly or use the @property decorator to achieve the same functionality.


Implementing Without Decorators​

When manually implementing getters and setters in Python, the following naming conventions are commonly used:

  • A getter that returns a class attribute is named in the format get_attributeName.

  • A setter that sets or modifies a class attribute is named in the format set_attributeName.

Example Usage of Getters and Setters
class Person:
    def __init__(self, name):
        # Private variable
        self.__name = name

    def get_name(self):
        return self.__name

    def set_name(self, value):
        # Check if value is a string
        if isinstance(value, str): 
            self.__name = value
        else:
            raise ValueError("Name must be a string.")

person = Person("John")
print(person.get_name())
# Outputs 'John'

person.set_name("Mike")
# Changes name to 'Mike'
print(person.get_name())
# Outputs 'Mike'

# Attempt to set an invalid value (will raise an error)
# person.set_name(123)

In the code above, the get_name method of the Person class returns the __name attribute, and the set_name method sets the value of __name.

The set_name method checks whether the value is a string, and if not, it raises a ValueError.

By implementing getters and setters, you gain control over attribute access and can ensure safe modification of attribute values.

In the next lesson, we'll learn how to implement getters and setters using the @property decorator.

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