A class method that takes another object as an argument and returns a new object. From http://interactivepython.org/runestone/static/pyladies/Classes/classesintro.html

ClassCreatesObject.py

class Point:

    def __init__(self, initX, initY):

        self.x = initX
        self.y = initY

    def getX(self):
        return self.x

    def getY(self):
        return self.y

    def distanceFromOrigin(self):
        return ((self.x ** 2) + (self.y ** 2)) ** 0.5

    def __str__(self):
        return "x=" + str(self.x) + ", y=" + str(self.y)

    def halfway(self, target):
         mx = (self.x + target.x)/2
         my = (self.y + target.y)/2
         return Point(mx, my)

p = Point(3,4)
q = Point(5,12)
mid = p.halfway(q)

print(mid)
print(mid.getX())
print(mid.getY())