>>> for i in range(400):
... 	l[random.randint(0,7)]
... 	
'g'
'g'
'c'
'c'
'b'
'b'
'g'
'g'
'd'
'g'
'd'
'f'
'd'
'a'
Traceback (most recent call last):
  File "<interactive input>", line 2, in ?
IndexError: list index out of range
>>> l
['a', 'b', 'c', 'd', 'e', 'f', 'g']
>>> 

have no idea what the problem is. check out the error though

Please read the doc carefully. randint(a, b) can return b:

http://docs.python.org/lib/module-random.html
> Return a random integer N such that a <= N <= b. 

So in your case, randint(0,7) is returning 7 and tries to access l's 8th element, which results in IndexError.

Closing as invalid.