last lab

labPython/lab16/task_5.py

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+# task: ListWork62 / Создание убывающего списка из файла
+
+import random
+
+
+class Node:
+    def __init__(self, data):
+        self.data = data
+        self.next = None
+
+
+def insert_desc(head, x):
+    node = Node(x)
+    if not head or x > head.data:
+        node.next = head
+        return node
+    cur = head
+    while cur.next and cur.next.data > x:
+        cur = cur.next
+    node.next = cur.next
+    cur.next = node
+    return head
+
+
+def print_list(h):
+    while h:
+        print(h.data, end=" ")
+        h = h.next
+    print()
+
+
+while True:
+    try:
+        print("\n1 - создать файл")
+        print("2 - обработать файл")
+        print("0 - выход")
+        c = input(">> ")
+
+        if c == "1":
+            n = int(input("N: "))
+            arr = [random.randint(1, 100) for _ in range(n)]
+            with open("data.txt", "w") as f:
+                f.write(str(n) + "\n")
+                f.write(" ".join(map(str, arr)))
+        elif c == "2":
+            with open("data.txt") as f:
+                n = int(f.readline())
+                arr = list(map(int, f.readline().split()))
+            head = None
+            for x in arr:
+                head = insert_desc(head, x)
+            print_list(head)
+        elif c == "0":
+            break
+    except:
+        print("Ошибка")