`__str__` is used for a user-friendly string representation, while `__repr__` is for an unambiguous representation useful for debugging. Implement both for better usability.

In Python, __str__ and __repr__ are special methods used to define string representations of class instances, serving different purposes. The __str__ method is intended to provide a user-friendly string representation of an object, which is more readable and suitable for display to end users. For example:

class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def __str__(self):
        return f'{self.name}, {self.age} years old'

On the other hand, the __repr__ method is used to provide a more detailed and unambiguous string representation that is useful for debugging. It should ideally return a string that can be used to recreate the object:

    def __repr__(self):
        return f'Person(name={self.name!r}, age={self.age!r})'

By implementing both methods in your classes, you enhance their usability and provide clear insights into their state, making it easier for developers to interact with your objects effectively.