Python Reverse Link List

linklist.py

class Node:
  def __init__(self, value):
    self._value = value
    self._next = None
  def __repr__(self):
    return ("Node({!r})".format(self._value))

def reverseList(head):
  '''
  reverses a linklist. 
  input: head of the link list
  output: returns the head of the reversed link list
  '''
  prev = None
  curr = head
  while (curr is not None):
    next  = curr._next
    curr._next, prev, curr = prev, curr, next
    print ("AFTER: prev({!r}) curr({!r}) next ({!r})".format(prev,curr,next))
  return prev
  
def createLinkList(values_list):
  '''
  creates a linklist with an array of values. 
  input: array of values
  output: returns the head of the created link list
  '''
  head = Node(0)
  curr = head
  for i in values_list:
    temp = Node(i)
    curr._next = temp
    curr = curr._next
  return head._next

def traverseList(head):
  '''
    traverses the elements of the link list
  '''
  l = head
  while (l):
    print "Node{!r}  value: {}".format(l,l._value)
    l = l._next

root = createLinkList(range(10,100,20))
traverseList(root)
y = reverseList(root)