[Python] Limits the scope of object comparison to some of the attributes when adding to a set

I have a Person class like this:

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

def __repr__(self):
return '<Person {}>'.format(self.name)


I want to add some instances of this class to a set, like this:

tom = Person('tom', 18)
mary = Person('mary', 22)
mary2 = Person('mary2', 22)

person_set = {tom, mary, mary2}
print(person_set)
# output: {<Person tom>, <Person mary>, <Person mary2>}


As you can see, there are 2 Marys in the set. How can I make it so that Person instances with the same age are considered the same person, and only added to the set once?

In other words, how can I get a result of {<Person tom>, <Person mary>}?

Continue reading...