def get_int():
    return 555

def get_math_int():
    return math.pow(2, 5)

class ClassFoo(object):
    def __init__(self, x, y):
        self.attr1 = "hello"
        self.attr2 = get_int()
        self.attr3 = get_math_int()

    def spam(self):
        return 77

class ClassBar(object):
    def __init__(self, x, y):
        self.attr4 = "hello"

    def spam(self):
        return 99