human
I am working on the file "Scroller Game Tutorial.ipynb".
The first task is:
In our code, we build a class RectangleMan which will represent our main character.  He has a few properties to manage his current velocity.
python
class RectangleMan(Widget):
    velocity_x = NumericProperty(0)
    velocity_y = NumericProperty(0)
    velocity = ReferenceListProperty(velocity_x, velocity_y)
The RectangleMan class also has a single method, move which will manipulate the velocity and position of our character on the screen.  For now it does nothing, but we'll fill in the details in further steps.
python
    def move(self):
        pass
We also created the ScrollerGame class, which will actually be part of the main event loop of the game, and which will call methods on other game objects to cause things to happen in our game.  For now, our update method does nothing, but we will that in later.
python
class ScrollerGame(Widget):
    def update(self, dt):
        pass
Lastly, to tie it all together, we created our ScrollerApp class, which represents the overall application.  This will do a few things to set the game up and get it running.  The ScrollerApp class has to inherit from Kivy's App class, and defines just one method - the build method, which Kivy will call for us when setting up the game initially.  In the build method, we create an instance of our root game object, ScrollerGame.  Then we use Kivy's Clock class to call the ScrollerGame.update method we defined.  The Clock class takes the time interval on which to call the update method - in this case we define it as 1.0 / 60.0, which means our game will run at 60 frames per second.
python
class ScrollerApp(App):
    def build(self):
        game = ScrollerGame()
        Clock.schedule_interval(game.update, 1.0/60.0)
        return game
At the bottom of our script, we use the standard Python trick that allows us to run our module as a script.  Here, we simply instantiate our ScrollerApp, and then call the run method that Kivy provides to beginning running the application.
Can you write Python program for it?
assistant
#Here is the Python program you requested.

# scroller.kv

<ScrollerGame>:
    canvas:
        Rectangle:
            pos: 0, 0
            size: self.width, 15

    RectangleMan:
        pos: 0, 15

<RectangleMan>:
    size: 20, 50
    canvas:
        Color:
            rgba: 0, 1, 0, 1
        Rectangle:
            pos: self.pos
            size: self.size