[Tutor] rotating a list

[kevin parks]

Hi. My python chops are a bit rusty but i need another pair of eyes to 
tell me what i am doing wrong. I am sure that it is something very 
stupid but i can't see what it is.. I am trying to cycle through a list 
like so

[a, b, c]
[b, c, a]
[c, a, b]
[a, b, c]

only, that aint be what is coming out the other side...

anyone see where things are going wrong?



cheers,
-kp--

--^----------------------------------------

kevin parks
university of virginia
k p p 9 c @ virginia . edu

PS. If my man Danny is out there... 'Hi'

P.P.S if there are any pythonistas out here at UVa, i'd love to hear 
from
you. i am new here.


import sys
import random

# cyclically rotate a sequence

# should work on any sequence type (list, tuple, string) and should 
work with
# any hop(n) interval and also work in both directions (left or right)

def rotate(seq, n=1):
     if len(seq) == 0:
         return seq
     n = n % len(seq) # Normalize n, using modulo - even works for 
negative n

     return seq[n:] + seq[:n]


def test():
	random.seed(720)        # reproducable results
	x = range(0, 12, 1)     # create a list for test purposes
	print x; print          # look at it
	random.shuffle(x)       # scramble it up
	print x; print          # look at again...
	# Now rotate the list one at a time till we've done come to
	# the beginning once again
	for i in range(len(x)):
		y = rotate(x)
		print y

if __name__ == "__main__":
	test()

output is something like:

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]

[2, 5, 4, 10, 11, 6, 0, 3, 9, 7, 1, 8]

[5, 4, 10, 11, 6, 0, 3, 9, 7, 1, 8, 2]
[5, 4, 10, 11, 6, 0, 3, 9, 7, 1, 8, 2]
[5, 4, 10, 11, 6, 0, 3, 9, 7, 1, 8, 2]
[5, 4, 10, 11, 6, 0, 3, 9, 7, 1, 8, 2]
[5, 4, 10, 11, 6, 0, 3, 9, 7, 1, 8, 2]
[5, 4, 10, 11, 6, 0, 3, 9, 7, 1, 8, 2]
[5, 4, 10, 11, 6, 0, 3, 9, 7, 1, 8, 2]
[5, 4, 10, 11, 6, 0, 3, 9, 7, 1, 8, 2]
[5, 4, 10, 11, 6, 0, 3, 9, 7, 1, 8, 2]
[5, 4, 10, 11, 6, 0, 3, 9, 7, 1, 8, 2]
[5, 4, 10, 11, 6, 0, 3, 9, 7, 1, 8, 2]
[5, 4, 10, 11, 6, 0, 3, 9, 7, 1, 8, 2]

--[End of dumb question]---