###################

# Broken code

class Ball:

def __init__(self, pos, rad):

self.position = pos

self.radius = rad

def get_position(self):

return self.position

b = Ball([0,0], 10)

print b.get_position()

###################

# Fixed code

class Ball:

def __init__(self, pos, rad):

self.position = pos

self.radius = rad

def get_position(self):

return self.position

b = Ball([0,0], 10)

print b.get_position()

##################

# Mutation with classes and objects

class Point:

def __init__(self, x, y):

self.x = x

self.y = y

def set_x(self, newx):

self.x = newx

def get_x(self):

return self.x

p = Point(4, 5)

q = Point(4, 5)

r = p

p.set_x(10)

print p.get_x()

print q.get_x()

print r.get_x()

##################

# Example while

def countdown(n):

"""Print the values from n to 0."""

i = n

while i >= 0:

print i

i -= 1

countdown(5)

##################

# Collatz

def collatz(n):

"""Prints the values in the Collatz sequence for n."""

i = n

while i > 1:

print i

if i % 2 == 0:

i = i / 2

else:

i = 3 * i + 1

collatz(1000)

#################

# Timeout

i = 1

while i <= 10:

i += 1

print i

print "Done!"