import math, random
 
class Ship(Collider):
    """The player's ship."""
    image = games.load_image("ship.bmp")
    sound = games.load_sound("thrust.wav")
 
    ROTATION_STEP = 3
    VELOCITY_STEP = .03
 
    def update(self):
        """Rotates based on keys pressed."""
        if games.keyboard.is_pressed(games.K_LEFT):
            self.angle -= Ship.ROTATION_STEP
        if games.keyboard.is_pressed(games.K_RIGHT):
            self.angle += Ship.ROTATION_STEP
        super(Ship, self).die()
 
        # apply thrust based on up arrow key
        if games.keyboard.is_pressed(games.K_UP):
            Ship.sound.play()
 
        # change velocity based on ship's angle
        angle = self.angle * math.pi / 180 #convert to radian
        self.dx += Ship.VELOCITY_STEP * math.sin(angle)
        self.dy += Ship.VELOCITY_STEP * -math.cos(angle)
 
 
the_ship = Ship(image = Ship.image,
    x = games.screen.width/2,
    y = games.screen.height/2)
 
games.screen.add(the_ship)

class Foobar:
    n = 10             # This variable belongs to the class Foobar
 
    def f(self, x):    # And so does this method
        self.n = x         # But these statements belongs to f
        return x           # because they have extra indentation

class Foobar:
    def f(self, n):
         self.n = x
 
   n = 10         # syntax error
 
         return x

class Foobar:
    n = 12         # before is okay
 
    def f(self, n):
         self.n = x
         return x
 
    n = 10         # and so is after!