import json
import os
from datetime import datetime
class Task:
"""表示单个任务的类"""
def __init__(self, title, description="", created_date=None, due_date=None, completed=False):
self.title = title
self.description = description
self.created_date = created_date or datetime.now().strftime("%Y-%m-%d %H:%M:%S")
self.due_date = due_date
self.completed = completed
self.completed_date = None
def mark_completed(self):
"""标记任务为已完成"""
self.completed = True
self.completed_date = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
def to_dict(self):
"""将任务转换为字典格式,便于JSON序列化"""
return {
"title": self.title,
"description": self.description,
"created_date": self.created_date,
"due_date": self.due_date,
"completed": self.completed,
"completed_date": self.completed_date
}
@classmethod
def from_dict(cls, data):
"""从字典创建任务对象"""
task = cls(
title=data["title"],
description=data.get("description", ""),
created_date=data.get("created_date"),
due_date=data.get("due_date"),
completed=data.get("completed", False)
)
task.completed_date = data.get("completed_date")
return task
class TodoList:
"""管理待办事项列表的类"""
def __init__(self, filename="todo_list.json"):
self.tasks = []
self.filename = filename
self.load_tasks()
def add_task(self, title, description="", due_date=None):
"""添加新任务"""
task = Task(title, description, due_date=due_date)
self.tasks.append(task)
self.save_tasks()
return task
def get_task_by_id(self, task_id):
"""根据ID获取任务"""
if 0 <= task_id < len(self.tasks):
return self.tasks[task_id]
return None
def mark_task_completed(self, task_id):
"""标记任务为已完成"""
task = self.get_task_by_id(task_id)
if task:
task.mark_completed()
self.save_tasks()
return True
return False
def delete_task(self, task_id):
"""删除任务"""
task = self.get_task_by_id(task_id)
if task:
self.tasks.remove(task)
self.save_tasks()
return True
return False
def get_pending_tasks(self):
"""获取所有未完成的任务"""
return [task for task in self.tasks if not task.completed]
def get_completed_tasks(self):
"""获取所有已完成的任务"""
return [task for task in self.tasks if task.completed]
def save_tasks(self):
"""保存任务到文件"""
tasks_data = [task.to_dict() for task in self.tasks]
with open(self.filename, 'w', encoding='utf-8') as f:
json.dump(tasks_data, f, ensure_ascii=False, indent=2)
def load_tasks(self):
"""从文件加载任务"""
if os.path.exists(self.filename):
try:
with open(self.filename, 'r', encoding='utf-8') as f:
tasks_data = json.load(f)
self.tasks = [Task.from_dict(data) for data in tasks_data]
except (json.JSONDecodeError, KeyError):
self.tasks = []
else:
self.tasks = []
class TodoApp:
"""TodoList应用程序的用户界面"""
def __init__(self):
self.todo_list = TodoList()
def display_menu(self):
"""显示主菜单"""
print("\n" + "="*40)
print("欢迎使用待办事项管理应用程序")
print("="*40)
print("1. 查看所有任务")
print("2. 查看未完成任务")
print("3. 查看已完成任务")
print("4. 添加新任务")
print("5. 标记任务为已完成")
print("6. 删除任务")
print("7. 退出应用程序")
print("="*40)
def display_tasks(self, tasks, title="任务列表"):
"""显示任务列表"""
print(f"\n{title}:")
print("-" * 60)
if not tasks:
print("没有任务。")
return
for i, task in enumerate(tasks, 1):
status = "✓" if task.completed else "○"
print(f"{i}. [{status}] {task.title}")
if task.description:
print(f" 描述: {task.description}")
if task.due_date:
print(f" 截止日期: {task.due_date}")
print(f" 创建时间: {task.created_date}")
if task.completed and task.completed_date:
print(f" 完成时间: {task.completed_date}")
print()
def get_user_input(self, prompt, required=True):
"""获取用户输入"""
while True:
value = input(prompt).strip()
if value or not required:
return value
print("此字段为必填项,请重新输入。")
def add_task_interface(self):
"""添加任务的用户界面"""
print("\n添加新任务:")
title = self.get_user_input("任务标题: ")
description = self.get_user_input("任务描述 (可选): ", required=False)
due_date = self.get_user_input("截止日期 (格式: YYYY-MM-DD, 可选): ", required=False)
if due_date and not self.validate_date_format(due_date):
print("日期格式无效,请使用 YYYY-MM-DD 格式。")
return
task = self.todo_list.add_task(title, description, due_date)
print(f"任务 '{task.title}' 已成功添加!")
def validate_date_format(self, date_str):
"""验证日期格式"""
try:
datetime.strptime(date_str, "%Y-%m-%d")
return True
except ValueError:
return False
def mark_task_completed_interface(self):
"""标记任务为已完成的用户界面"""
pending_tasks = self.todo_list.get_pending_tasks()
if not pending_tasks:
print("没有未完成的任务。")
return
self.display_tasks(pending_tasks, "未完成任务列表")
try:
task_id = int(self.get_user_input("请输入要标记为已完成的任务编号: ")) - 1
if self.todo_list.mark_task_completed(task_id):
print("任务已标记为已完成!")
else:
print("无效的任务编号。")
except ValueError:
print("请输入有效的数字。")
def delete_task_interface(self):
"""删除任务的用户界面"""
if not self.todo_list.tasks:
print("没有任务可删除。")
return
self.display_tasks(self.todo_list.tasks, "所有任务列表")
try:
task_id = int(self.get_user_input("请输入要删除的任务编号: ")) - 1
if self.todo_list.delete_task(task_id):
print("任务已成功删除!")
else:
print("无效的任务编号。")
except ValueError:
print("请输入有效的数字。")
def run(self):
"""运行应用程序"""
while True:
self.display_menu()
choice = self.get_user_input("请选择操作 (1-7): ")
if choice == "1":
self.display_tasks(self.todo_list.tasks, "所有任务")
elif choice == "2":
self.display_tasks(self.todo_list.get_pending_tasks(), "未完成任务")
elif choice == "3":
self.display_tasks(self.todo_list.get_completed_tasks(), "已完成任务")
elif choice == "4":
self.add_task_interface()
elif choice == "5":
self.mark_task_completed_interface()
elif choice == "6":
self.delete_task_interface()
elif choice == "7":
print("感谢使用待办事项管理应用程序,再见!")
break
else:
print("无效的选择,请重新输入。")
if __name__ == "__main__":
app = TodoApp()
app.run()