'''
Given an array of ints length 3, return an array with the elements "rotated left" so {1, 2, 3} yields {2, 3, 1}. 

rotate_left3([1, 2, 3]) → [2, 3, 1]
rotate_left3([5, 11, 9]) → [11, 9, 5]
rotate_left3([7, 0, 0]) → [0, 0, 7]'''


def rotate_left3(nums):
    a = nums
    a[0]=nums[1]
    #print a[0]
    a[1]=nums[2]
    #print a[1]
    a[2]=nums[0] #bug?
    #print a[2]
    return a

print rotate_left3([1,2,3])