star wars 3D surprise

something space related.
This is also off of my hello world book.

Type this:

import pygame, sys
from math import *
pygame.init()
#wider screen than LunarLander, since we have sideways motion
screen = pygame.display.set_mode([800,600])
screen.fill([0, 0, 0])
ground  = 540   #landing pad is ay y = 540
start = 90      # starting location 90 pixels from top of window
clock = pygame.time.Clock()
ship_mass = 5000.0
fuel = 5000.0
fps = 30  #default
x_loc = 20  # x-location in meters = dist from center of landing pad
y_loc = 40  # y-location in meters = height above the landing pad

x_offset = 40    # offsets so that when ship location is (0,0), ship is
y_offset = -108  #   just touching landing pad, and centered.

x_speed = 2000.0   #pixels/frame
y_speed = -800.0

x_velocity = x_speed/(10.0*fps)  #m/s
y_velocity = y_speed/(10.0*fps)

gravity = 1.5
thrust = 0
delta_v = 0
scale = 10   #scale factor from pixels to meters
throttle_down = False
left_down = False
right_down = False
#held_down = False
count = 0
x_pos = 0
y_pos = 0

"""
x_pos, y_pos in pixels - (0,0) is top left
x_loc, y_loc in meters - (0,0) is center of landing pad

x_speed, y_speed in pixels per frame.
x_velocity, y_velocity in m/s

scale factor = 10  (10 pixels = 1 meter)

pos (pixels) to loc (meters) is scaled by: scaleFactor (meters/pixel)
speed (pixels/frame) to velocity (m/s) is scaled by:
ScaleFactor * FPS (Frames Per Second)

"""


# sprite for the ship
class ShipClass(pygame.sprite.Sprite):
  def __init__(self, image_file, position):
   
      pygame.sprite.Sprite.__init__(self)
      self.imageMaster = pygame.image.load(image_file)
      self.image = self.imageMaster
      self.rect = self.image.get_rect()
      self.position = position
      self.rect.centerx, self.rect.centery = self.position
      self.angle = 0

  def update(self):
      self.rect.centerx, self.rect.centery = self.position
      oldCenter = self.rect.center
      self.image = pygame.transform.rotate(self.imageMaster, self.angle)
      self.rect = self.image.get_rect()
      self.rect.center = oldCenter