How do I implement equality and ordering on a class?

In Python, you can implement equality and ordering in a class by defining the special methods `__eq__` and `__lt__` (less than). By doing so, you can use the equality operator (`==`) and ordering operators (`<`, `>`, etc.) with instances of your class.

Here’s an example of how to implement these features in a class called `Person`:


class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age
    
    def __eq__(self, other):
        return self.age == other.age
    
    def __lt__(self, other):
        return self.age < other.age

# Example usage
person1 = Person("Alice", 30)
person2 = Person("Bob", 25)

# Check equality
print(person1 == person2)  # Output: False

# Check ordering
print(person1 < person2)   # Output: False
print(person1 > person2)   # Output: True

Python equality ordering class methods __eq__ __lt__ object comparison

How do I implement equality and ordering on a class?

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How do I implement equality and ordering on a class?

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