{"id":145758,"date":"2025-07-07T17:33:01","date_gmt":"2025-07-07T12:03:01","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=145758"},"modified":"2025-07-07T17:33:01","modified_gmt":"2025-07-07T12:03:01","slug":"to-do-list-using-dsa-python","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/to-do-list-using-dsa-python\/","title":{"rendered":"DSA Python Project &#8211; To Do List"},"content":{"rendered":"<h3>Program 1<\/h3>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\"># To-Do List Using Singly Linked List\r\nclass Task:\r\n    def __init__(self, task_id, description):\r\n        self.id = task_id\r\n        self.description = description\r\n        self.completed = False\r\n        self.next = None\r\n\r\n\r\nclass ToDoList:\r\n    def __init__(self):\r\n        self.head = None\r\n        self.task_count = 0\r\n\r\n    def add_task(self):\r\n        desc = input(\"Enter task description: \").strip()\r\n        self.task_count += 1\r\n        new_task = Task(self.task_count, desc)\r\n\r\n        if self.head is None:\r\n            self.head = new_task\r\n        else:\r\n            temp = self.head\r\n            while temp.next:\r\n                temp = temp.next\r\n            temp.next = new_task\r\n\r\n        print(\"Task added successfully.\")\r\n\r\n    def display_tasks(self):\r\n        if not self.head:\r\n            print(\"To-Do List is empty.\")\r\n            return\r\n\r\n        print(\"\\nTo-Do List:\")\r\n        temp = self.head\r\n        while temp:\r\n            status = \"[X]\" if temp.completed else \"[ ]\"\r\n            print(f\"ID: {temp.id} | {status} {temp.description}\")\r\n            temp = temp.next\r\n\r\n    def mark_completed(self):\r\n        try:\r\n            task_id = int(input(\"Enter task ID to mark as completed: \"))\r\n        except ValueError:\r\n            print(\"Invalid input.\")\r\n            return\r\n\r\n        temp = self.head\r\n        while temp:\r\n            if temp.id == task_id:\r\n                temp.completed = True\r\n                print(\"Task marked as completed.\")\r\n                return\r\n            temp = temp.next\r\n\r\n        print(f\"Task with ID {task_id} not found.\")\r\n\r\n    def delete_task(self):\r\n        try:\r\n            task_id = int(input(\"Enter task ID to delete: \"))\r\n        except ValueError:\r\n            print(\"Invalid input.\")\r\n            return\r\n\r\n        temp = self.head\r\n        prev = None\r\n\r\n        while temp and temp.id != task_id:\r\n            prev = temp\r\n            temp = temp.next\r\n\r\n        if not temp:\r\n            print(f\"Task with ID {task_id} not found.\")\r\n            return\r\n\r\n        if not prev:\r\n            self.head = temp.next\r\n        else:\r\n            prev.next = temp.next\r\n\r\n        print(\"Task deleted successfully.\")\r\n\r\n\r\ndef main():\r\n    todo_list = ToDoList()\r\n\r\n    while True:\r\n        print(\"\\n----- To-Do List Menu -----\")\r\n        print(\"1. Add Task\")\r\n        print(\"2. Display Tasks\")\r\n        print(\"3. Mark Task as Completed\")\r\n        print(\"4. Delete Task\")\r\n        print(\"5. Exit\")\r\n        print(\"---------------------------\")\r\n        choice = input(\"Enter your choice: \").strip()\r\n\r\n        if choice == '1':\r\n            todo_list.add_task()\r\n        elif choice == '2':\r\n            todo_list.display_tasks()\r\n        elif choice == '3':\r\n            todo_list.mark_completed()\r\n        elif choice == '4':\r\n            todo_list.delete_task()\r\n        elif choice == '5':\r\n            print(\"Exiting program.\")\r\n            break\r\n        else:\r\n            print(\"Invalid choice. Try again.\")\r\n\r\n\r\nif __name__ == \"__main__\":\r\n    main()<\/pre>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Program 1 # To-Do List Using Singly Linked List class Task: def __init__(self, task_id, description): self.id = task_id self.description = description self.completed = False self.next = None class ToDoList: def __init__(self): self.head = None&#46;&#46;&#46;<\/p>\n","protected":false},"author":581,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32847],"tags":[32853,32923,34829,32848,22641,34831,34103,34832,34830],"class_list":["post-145758","post","type-post","status-publish","format-standard","hentry","category-dsa-python-tutorials","tag-dsa-python","tag-dsa-python-program","tag-dsa-python-project","tag-dsa-using-python","tag-to-do-list","tag-to-do-list-in-dsa-python","tag-to-do-list-project","tag-to-do-list-project-in-dsa-python","tag-to-do-list-using-dsa-python"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>DSA Python Project - To Do List - DataFlair<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/data-flair.training\/blogs\/to-do-list-using-dsa-python\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DSA Python Project - To Do List - DataFlair\" \/>\n<meta property=\"og:description\" content=\"Program 1 # To-Do List Using Singly Linked List class Task: def __init__(self, task_id, description): self.id = task_id self.description = description self.completed = False self.next = None class ToDoList: def __init__(self): self.head = None&#046;&#046;&#046;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/data-flair.training\/blogs\/to-do-list-using-dsa-python\/\" \/>\n<meta property=\"og:site_name\" content=\"DataFlair\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/DataFlairWS\/\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-07T12:03:01+00:00\" \/>\n<meta name=\"author\" content=\"DataFlair Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@DataFlairWS\" \/>\n<meta name=\"twitter:site\" content=\"@DataFlairWS\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"DataFlair Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"DSA Python Project - To Do List - DataFlair","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/data-flair.training\/blogs\/to-do-list-using-dsa-python\/","og_locale":"en_US","og_type":"article","og_title":"DSA Python Project - To Do List - DataFlair","og_description":"Program 1 # To-Do List Using Singly Linked List class Task: def __init__(self, task_id, description): self.id = task_id self.description = description self.completed = False self.next = None class ToDoList: def __init__(self): self.head = None&#46;&#46;&#46;","og_url":"https:\/\/data-flair.training\/blogs\/to-do-list-using-dsa-python\/","og_site_name":"DataFlair","article_publisher":"https:\/\/www.facebook.com\/DataFlairWS\/","article_published_time":"2025-07-07T12:03:01+00:00","author":"DataFlair Team","twitter_card":"summary_large_image","twitter_creator":"@DataFlairWS","twitter_site":"@DataFlairWS","twitter_misc":{"Written by":"DataFlair Team","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/data-flair.training\/blogs\/to-do-list-using-dsa-python\/#article","isPartOf":{"@id":"https:\/\/data-flair.training\/blogs\/to-do-list-using-dsa-python\/"},"author":{"name":"DataFlair Team","@id":"https:\/\/data-flair.training\/blogs\/#\/schema\/person\/c187795dc82ab948373cca526df7c445"},"headline":"DSA Python Project &#8211; 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