206_Reverse-Linked-List.py

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next
class Solution:
    def reverseList(self, head: ListNode) -> ListNode:
        
        rev = None
        while head:
            tmp = head
            head, tmp.next, rev = head.next, rev, tmp
            
        return rev