Robot

gistfile1.py

class Robot():
    def __init__(self):
        self._heading = 0

    @property
    def heading(self):
        print("Getting " + str(self._heading))
        return self._heading

    @heading.setter
    def heading(self, val):
        print("Setting to " + str(val))
        self._heading = val

myrobot = Robot()
myrobot.heading
myrobot.heading = 1

"""
Why the difference?

$ python minimal.py 
Getting 0
$ python3 minimal.py 
Getting 0
Setting to 1


"""

Fixed - this needs to be a new-style class.
That is, in Python 2, the declaration must be class Robot(object)