get method within max function for a dictionary

[Gribouillis]

Suppose that you want to find the person in a group who owns the most expensive car. In python, you would write it like so

person = max(group, key=price_of_ones_car)

Here group is an iterable of people, such as a list or a dict which keys are people, and price_of_ones_car is a function that returns the price of a person's car

def price_of_ones_car(person):
    return ...

Notice that you don't call the function when you call max(). The function will be called for each person by the max function, but you don't need to do it yourself.