Task Breakdown

Bắt đầu với cấu trúc todo_app được yêu cầu: todo.py, tasks.json và README.md. Xác minh thiết lập Python bằng python --version, sau đó chạy python todo.py trong khi kiểm tra hành vi thêm, xem, hoàn thành, xóa, thoát và lưu trữ. Được xem là hoàn tất khi các tính năng CLI được mô tả hoạt động và README ghi lại thông tin về ứng dụng cũng như cách sử dụng.

1)Set Up Your Environment:

Ensure Python is installed on your machine.
You can check this by running:
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python --version
Project Structure:

Create a directory for the project named todo_app.

Inside it, create the following files:

todo.py: This will contain the main application logic.
tasks.json: This will store the tasks in JSON format.
README.md: Add documentation.
Your file structure should look like this:

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/todo_app
├── todo.py # Main application logic
├── tasks.json # File to store tasks
└── README.md # Documentation
Implement Core Features:

2)Task Class:

Define a Task class that represents individual tasks in the app. This class should handle the creation of tasks and the ability to mark them as completed:
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class Task:
def init(self, title, description, category):
self.title = title
self.description = description
self.category = category
self.completed = False

def mark_completed(self):
    self.completed = True

3)File Handling:

Use Python's json module to store tasks in a tasks.json file. This allows persistence across runs of the application.

Code to save tasks:

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import json

def save_tasks(tasks):
with open('tasks.json', 'w') as f:
json.dump([task.dict for task in tasks], f)
Code to load tasks:

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def load_tasks():
try:
with open('tasks.json', 'r') as f:
return [Task(**data) for data in json.load(f)]
except FileNotFoundError:
return []
4)User Interaction:

Implement a simple command-line interface (CLI) to interact with the user. This will include options to add a task, view tasks, mark tasks as completed, delete tasks, and exit the application.
Here's a sample implementation of the main() function:

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def main():
tasks = load_tasks()
while True:
print("1. Add Task")
print("2. View Tasks")
print("3. Mark Task Completed")
print("4. Delete Task")
print("5. Exit")

    choice = input("Choose an option: ")

    if choice == '1':
        # Add task
        title = input("Title: ")
        description = input("Description: ")
        category = input("Category: ")
        tasks.append(Task(title, description, category))
    elif choice == '2':
        # View tasks
        for idx, task in enumerate(tasks, 1):
            status = "Completed" if task.completed else "Incomplete"
            print(f"{idx}. {task.title} - {status}")
    elif choice == '3':
        # Mark task as completed
        task_num = int(input("Enter task number to mark as completed: "))
        tasks[task_num - 1].mark_completed()
    elif choice == '4':
        # Delete task
        task_num = int(input("Enter task number to delete: "))
        del tasks[task_num - 1]
    elif choice == '5':
        save_tasks(tasks)
        break

5)Testing and Documentation:

Thoroughly test your app by adding, viewing, marking, and deleting tasks.
Document the purpose of the app and how to use it in the README.md file.
README.md Example:
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To-Do App

A simple command-line To-Do list manager built with Python.

Features:

• Add tasks with titles, descriptions, and categories.
• View tasks and their completion status.
• Mark tasks as completed.
• Delete tasks.
• Save tasks to a JSON file for persistence.

Usage:

1. Run the application:

   python todo.py
   

Follow the on-screen instructions to manage your tasks.
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