Reverse - Linked List

reverseLinkedList.py

class ListNode:
    def __init__(self, x):
        self.val = x
        self.next = None

class Utilities:
    def reverseList(head: ListNode):
        currPtr = head
        prevPtr = None

        while currPtr != None:
            nextPtr      = currPtr.next
            currPtr.next = prevPtr

            prevPtr = currPtr
            currPtr = nextPtr

        return prevPtr