from visual import *
 
floor = box(length=4, height=0.5, width=4, color=color.blue)
 
ball = sphere(pos=(0,4,0), color=color.red)
ball.velocity = vector(0,-1,0)
 
dt = 0.01
while 1:
    rate(100)
    ball.pos = ball.pos + ball.velocity*dt
    if ball.y < 1:
        ball.velocity.y = -ball.velocity.y
    else:
        ball.velocity.y = ball.velocity.y - 9.8*dt

Traceback (most recent call last):
  File "C:\Python26\Lib\site-packages\visual\examples\bounce.py", line 1
    from visual import *
  File "C:\Python26\lib\site-packages\visual\__init__.py", line 59
    import cvisual
AttributeError: 'Boost.Python.StaticProperty' object attribute '__doc__' is read-only
>>>