last lab

labPython/lab16/task_3.py

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+class Node:
+    def __init__(self, data):
+        self.data = data
+        self.next = None
+
+
+def build(arr):
+    head = None
+    for x in reversed(arr):
+        node = Node(x)
+        node.next = head
+        head = node
+    return head
+
+
+def find_second(head):
+    count = 0
+    while head:
+        if head.data % 6 == 0:
+            count += 1
+            if count == 2:
+                return head
+        head = head.next
+    return None
+
+
+while True:
+    try:
+        print("\n1 - создать список")
+        print("2 - найти элемент")
+        print("0 - выход")
+        c = input(">> ")
+
+        if c == "1":
+            arr = list(map(int, input().split()))
+            head = build(arr)
+        elif c == "2":
+            res = find_second(head)
+            print(res.data if res else "nil")
+        elif c == "0":
+            break
+    except:
+        print("Ошибка")