Algoverse_adesh_43

#User function Template for python3

'''
class Node:
    def __init__(self, data):
        self.data = data
        self.next = None
        self.prev = None
'''


class Solution:
    def reverseDLL(self, head):
        if head.next == None:
            return head

        else:
            curr = head
            prevv = None
            while curr != None:
                prevv = curr
                curr.next, curr.prev =  curr.prev , curr.next
                curr = curr.prev

            return prevv