Python 3.6.1
>>> %Run L09-iteration.py
>>> number_guessing_game()
Guess a number: 50
too high
Guess a number: 25
too high
Guess a number: 12
too high
Guess a number: 6
too low
Guess a number: 8
correct!
>>> %Run L09-iteration.py
>>> investmentDoubles(.05)
15
>>> investmentDoubles(.10)
8
>>> investmentDoubles(.30)
3
>>> shift_letter('x', 2)
'z'
>>> shift_letter('y', 2)
' '
>>> shift_letter('z', 2)
'a'
>>> s = 'xyz'
>>> for c in s:
    print(c)
    
x
y
z
>>> for i in range(5):
    print(i)
    
0
1
2
3
4
>>> %Run L09-iteration.py
>>> fools_encrypt('abcd')
'aaabbbcccddd'
>>> for v in range(4):
    print(v)
    
0
1
2
3
>>> for c in 'hello':
    print(c)
    
h
e
l
l
o
>>> for c in 'hello':
    print(c*2)
    
hh
ee
ll
ll
oo
>>> for c in 'hello':
    print(shift_letter(c, 1))
    
i
f
m
m
p
>>> for c in 'hello':
    print(shift_letter(c, 1), end='')
    
ifmmp
>>> draw_square_with_loop(100)
>>> %Run L09-iteration.py
>>>