[1] add main.py

semyanovra/docs/data/1-st/main.py

@@ -0,0 +1,80 @@
+
+def ll_insert(head, name, phone):
+    current = head
+    # Проверяем, существует ли уже такой абонент
+    while current is not None:
+        if current['name'] == name:
+            current['phone'] = phone
+            return head
+        current = current['next']
+
+    # Создаём новый узел
+    new_node = {'name': name, 'phone': phone, 'next': None}
+
+    # Если список пуст, новый узел становится головой
+    if head is None:
+        return new_node
+
+    # Иначе проходим в конец и вставляем
+    current = head
+    while current['next'] is not None:
+        current = current['next']
+    current['next'] = new_node
+    return head
+
+
+def ll_find(head, name):
+    current = head
+    while current is not None:
+        if current['name'] == name:
+            return current['phone']
+        current = current['next']
+    return None
+
+
+def ll_delete(head, name):
+    if head is None:
+        return None
+
+    # Если удаляемый элемент — голова
+    if head['name'] == name:
+        return head['next']
+
+    prev = head
+    current = head['next']
+    while current is not None:
+        if current['name'] == name:
+            prev['next'] = current['next']
+            return head
+        prev = current
+        current = current['next']
+    return head
+
+
+def ll_list_all(head):
+    records = []
+    current = head
+    while current is not None:
+        records.append((current['name'], current['phone']))
+        current = current['next']
+    records.sort(key=lambda x: x[0])
+    return records
+
+
+# --------------------- Тестирование связного списка ---------------------
+if __name__ == "__main__":
+    print("=== Тестирование связного списка ===")
+    head = None
+
+    head = ll_insert(head, "Ivan", "123-456")
+    head = ll_insert(head, "Boris", "789-012")
+    head = ll_insert(head, "Anna", "345-678")
+    head = ll_insert(head, "Ivan", "111-222")  # обновление
+
+    print("Все записи:", ll_list_all(head))
+    print("Телефон Ivan:", ll_find(head, "Ivan"))
+    print("Телефон Boris:", ll_find(head, "Boris"))
+    print("Телефон Noname:", ll_find(head, "Noname"))
+
+    head = ll_delete(head, "Boris")
+    print("После удаления Boris, все записи:", ll_list_all(head))