Odd Even Linkedlist

class ListNode:
   def __init__(self, data, next = None):
      self.val = data
      self.next = next
def make_list(elements):
   head = ListNode(elements[0])
   for element in elements[1:]:
      ptr = head
      while ptr.next:
         ptr = ptr.next
      ptr.next = ListNode(element)
   return head
def print_list(head):
   ptr = head
   print('[', end = "")
   while ptr:
      print(ptr.val, end = ", ")
      ptr = ptr.next
   print(']')
class Solution(object):
   def oddEvenList(self, head):
      if head == None or head.next ==None:
         return head
      head1=head
      head2,head2_beg= head.next,head.next
      while head2.next!= None and head2.next.next!= None:
         head1.next = head2.next
         head2.next = head2.next.next
         head1 = head1.next
         head2 = head2.next
      if head2.next!=None:
         head1.next = head2.next
         head1 = head1.next
      head1.next = head2_beg
      head2.next = None
      return head
ob1 = Solution()
head = make_list([1,22,13,14,25])
print_list(ob1.oddEvenList(head))