last lab

labPython/lab17/task_2.py

@@ -0,0 +1,58 @@
+class Node:
+    def __init__(self, data):
+        self.data = data
+        self.prev = None
+        self.next = None
+
+
+def create_list(arr):
+    if not arr:
+        return None, None
+    head = Node(arr[0])
+    cur = head
+    for x in arr[1:]:
+        n = Node(x)
+        cur.next = n
+        n.prev = cur
+        cur = n
+    return head, cur
+
+
+def print_list(head):
+    res = []
+    cur = head
+    while cur:
+        res.append(str(cur.data))
+        cur = cur.next
+    print("Список:", " ".join(res))
+
+
+def shift(head, last, k):
+    if not head:
+        return head, last
+    last.next = head
+    head.prev = last
+    cur = head
+    for _ in range(k):
+        cur = cur.next
+    new_head = cur
+    new_last = cur.prev
+    new_last.next = None
+    new_head.prev = None
+    return new_head, new_last
+
+
+while True:
+    try:
+        print("\n1 - Ввести список\n0 - Выход")
+        cmd = input("Выбор: ")
+        if cmd == "0":
+            break
+        if cmd == "1":
+            arr = list(map(int, input("Введите числа: ").split()))
+            k = int(input("Введите K: "))
+            head, last = create_list(arr)
+            head, last = shift(head, last, k)
+            print_list(head)
+    except:
+        print("Ошибка")