课程进度 95% · 第11/11章第11/11章 · 标签 1/2
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项目：命令行待办事项
实现一个命令行待办事项管理工具，综合运用文件操作、异常处理和面向对象编程。
python
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import json
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import os
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from datetime import datetime
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class TodoItem:
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def __init__(self, title, desc="", priority="中"):
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self.id = id(self)
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self.title = title
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self.description = desc
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self.priority = priority
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self.completed = False
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self.created_at = datetime.now()
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def toggle(self):
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self.completed = not self.completed
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def __str__(self):
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status = "✓" if self.completed else "○"
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return f"[{status}] {self.title} ({self.priority})"
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class TodoList:
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def __init__(self, filename="todos.json"):
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self.filename = filename
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self.items = []
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self.load()
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def add(self, title, desc="", priority="中"):
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item = TodoItem(title, desc, priority)
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self.items.append(item)
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self.save()
— 2 —
项目功能实现
python
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def list_all(self):
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if not self.items:
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print("暂无待办事项")
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return
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for i, item in enumerate(self.items, 1):
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print(f"{i}. {item}")
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def complete(self, index):
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if 0 <= index < len(self.items):
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self.items[index].toggle()
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self.save()
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def delete(self, index):
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if 0 <= index < len(self.items):
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self.items.pop(index)
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self.save()
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def save(self):
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data = [{
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"title": item.title,
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"desc": item.description,
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"priority": item.priority,
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"completed": item.completed
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} for item in self.items]
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with open(self.filename, "w") as f:
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json.dump(data, f, ensure_ascii=False)
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def load(self):
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if os.path.exists(self.filename):
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with open(self.filename, "r") as f:
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data = json.load(f)
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for item_data in data:
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item = TodoItem(
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item_data["title"],
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item_data.get("desc", ""),
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item_data.get("priority", "中")
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)
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item.completed = item_data.get("completed", False)
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self.items.append(item)