Shuffle position of elements in a list

Question

Possible Duplicate:
Shuffling a list of objects in python

IF I have a list:

a = ["a", "b", "c", ..., "zzz"]

how can I randomly shuffle its elements in order to obtain a list:

b = ["c", "zh", ...]

without consuming a lot of the system's resources?

Answer 1

import random
b = list(a)
random.shuffle(b)

Answer 2

random.shuffle() shuffles a sequence in-place.

Answer 3

Not sure how much resources it consumes, but shuffle in the random module does exactly like this.

import random
a = [1,2,3,4,5]
random.shuffle(a)