I am stuck in the level Zig Zag and Zoom, in the desert, and I just get stuck after the first zig-zag. I don’t understand what is wrong with my code so please help me understand what my error is so I will not make it again. =)

# Escape from Death Valley!

# Move by with a zigzag pattern using real modulo functions.

# This function returns a value from 0 to 15:

def mod15(n):

while n >= 15:

n -= 15

return n

# This function should return a value from 0 to 9:

def mod9(n):

# While n is greater or equal to 9, subtract 9 from n:

while n > 9:

n = n-9

return n

# Don’t change the following code:

while True:

time = hero.time

if time < 30:

y = 10 + 3 * mod15(time)

else:

y = 20 + 3 * mod9(time)

x = 10 + time

hero.moveXY(x, y)