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2-add-two-numbers/2-add-two-numbers.py

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+# Definition for singly-linked list.
+# class ListNode(object):
+#     def __init__(self, val=0, next=None):
+#         self.val = val
+#         self.next = next
+class Solution(object):
+    def addTwoNumbers(self, l1, l2):
+        """
+        :type l1: ListNode
+        :type l2: ListNode
+        :rtype: ListNode
+        """
+        sum = ListNode((l1.val + l2.val) % 10)
+        carry = (l1.val + l2.val) / 10
+        follow = sum
+        num1 = l1.next
+        num2 = l2.next
+        while num1 != None or num2 != None or carry > 0:
+            if num1 == None and num2 == None:
+                follow.next = ListNode(carry)
+                carry = 0
+            elif num1 == None:
+                follow.next = ListNode((num2.val + carry) % 10)
+                follow = follow.next
+                carry = (num2.val + carry) / 10
+                num2 = num2.next
+            elif num2 == None:
+                follow.next = ListNode((num1.val + carry) % 10)
+                follow = follow.next
+                carry = (num1.val + carry) / 10
+                num1 = num1.next
+            else:
+                follow.next = ListNode((num1.val + num2.val + carry) % 10)
+                follow = follow.next
+                carry = (num1.val + num2.val + carry) / 10
+                num1 = num1.next
+                num2 = num2.next
+        return sum