Mar. 17

fruit = 'rampage'
"""
>>> type(fruit)
<type 'str'>
>>> len(fruit)
7
>>> fruit[:3]
'ram'
"""

if __name__ == '__main__':
import doctest
doctest.testmod()

This program I had to do to make it pass the doctest.

from gasp import *

begin_graphics(800, 600, title="Catch", background=color.YELLOW)

set_speed(120)

ball_x = 10

ball_y = 300

ball = Circle((ball_x, ball_y), 10, filled=True)

dx = 4

dy = 1

while ball_x < 810:

ball_x += dx

ball_y += dy

move_to(ball, (ball_x, ball_y))

update_when('next_tick')

end_graphics()

The above program makes a ball appear then fly across the screen until it hits the side of the window and disappears. The background also to this graphic is then yellow. I can manipulate the color of the background by just changing the color, I can also change the speed of the ball flying across the screen.

>>> from gasp import *

>>> i = 0

>>> while i < 10:

...     print random_between(-5, 5)

...     i += 1

... 

5

2

-4

5

-5

-5

4

-5

4

-1

The above program is called a more or less random integer. This program will random choose 10 numbers between -5 and 5, so really your results to this program varies. 

from gasp import *

begin_graphics(800, 600, title="Catch", background=color.RED)

set_speed(120)

ball_x = 10

ball_y = 300

ball = Circle((ball_x, ball_y), 10, filled=True)

dx = 4

dy = random_between(-4, 4)

while ball_x < 810:

ball_x += dx

ball_y += dy

move_to(ball, (ball_x, ball_y))

update_when('next_tick')

end_graphics()

The above program has been modified to appear with a background of red and then I changed the dy = 1 to dy = random_between(-4, 4) which will cause a random number to be chosen to be used for the direction of the ball