human
I am working on the file "01_Sort.ipynb".
The first task is:
merge two sorted lists

Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists.
Can you write Python program for it?
 ... What is a the Python program you requested?
assistant
#Here is the Python program you requested.

# Definition for singly-linked list.
# class ListNode(object):
#     def __init__(self, x):
#         self.val = x
#         self.next = None

class Solution(object):
    def mergeTwoLists(self, l1, l2):
        """
        :type l1: ListNode
        :type l2: ListNode
        :rtype: ListNode
        """
        
        dummy = node = ListNode(0)
        while l1 and l2:
            if l1.val <= l2.val:
                node.next = l1
                l1 = l1.next
            else:
                node.next = l2
                l2 = l2.next
            node = node.next
        node.next = l1 or l2
        
        return dummy.next
        
        
        # if not l1:
        #     return l2
        # elif not l2:
        #     return l1
        
        # head = ListNode(0)
        # node = head
        
        # while l1 and l2:
        #     if l1.val <= l2.val:
        #         node.next = l1
        #         l1 = l1.next
        #     else:
        #         node.next = l2
        #         l2 = l2.next
        #     node = node.next
        # node.next = l1 if not l2 else l2
        # head = head.next
        
        # return head