turning a function into a method

cool.py

class User:
    def __init__(self, coolness_factor)
        self.coolness_factor = coolness_factor

cool_user = User(coolness_factor=100)
uncool_user = User(coolness_factor=1)

def user_is_cool(user):
    return user.coolness_factor > 50

user_is_cool(cool_user) # => True
user_is_cool(uncool_user) # => False

User.is_cool = user_is_cool

cool_user.is_cool() # => True
uncool_user.is_cool() # => False