Question

The error:

Error   Traceback (most recent call last):
  File "/home/enrique/Dropbox/Public/pygametut3.py", line 41, in <module>
    pix = MovingPixel(width/2, height/2)
TypeError: this constructor takes no arguments

The Code:

#Creat a moving pixel
pix = MovingPixel(width/2, height/2)

while running:
    pix.move()

    if pix.x <= 0 or pix.x >= width or pix.y <= 0 or pix.y >= height:
        print "Crash"
        running = False

Answer 1

Because MovingPixel needs to be instantiated with no arguments:

pix = MovingPixel()