70 lines
2.0 KiB
Python
70 lines
2.0 KiB
Python
# 第 2-9 课完整示例：任务业务功能模块
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#
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# 本模块使用字典表示任务。面向对象的“类”会在第三阶段学习。
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from functools import wraps
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def log_call(func):
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@wraps(func)
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def wrapper(*args, **kwargs):
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print(f"正在执行：{func.__name__}")
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return func(*args, **kwargs)
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return wrapper
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def get_next_task_id(tasks: list[dict[str, object]]) -> int:
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"""根据已有任务计算下一个可用编号。"""
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if not tasks:
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return 1
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# 列表推导式只取出编号；max() 找到其中最大的编号。
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task_ids = [int(task["id"]) for task in tasks]
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return max(task_ids) + 1
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@log_call
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def add_task(tasks, title: str, priority: str) -> dict[str, object]:
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"""创建一条未完成任务，添加到列表并返回这条新任务。"""
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cleaned_title = title.strip()
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if not cleaned_title:
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raise ValueError("任务标题不能为空。")
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task = {
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"id": get_next_task_id(tasks),
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"title": cleaned_title,
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"priority": priority,
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"completed": False,
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}
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tasks.append(task)
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return task
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@log_call
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def complete_task(tasks: list[dict[str, object]], task_id: int) -> bool:
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"""按编号把任务标记为完成；找到任务返回 True，否则返回 False。"""
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for task in tasks:
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if task["id"] == task_id:
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task["completed"] = True
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return True
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return False
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def generate_pending_tasks(tasks: list[dict[str, object]]):
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"""逐条生成未完成任务，不预先创建新的完整列表。"""
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for task in tasks:
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if not task["completed"]:
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yield task
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def build_task_report(tasks: list[dict[str, object]]) -> dict[str, object]:
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"""汇总全部、已完成和未完成任务数量。"""
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completed_tasks = [task for task in tasks if task["completed"]]
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return {
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"total": len(tasks),
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"completed": len(completed_tasks),
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"pending": len(tasks) - len(completed_tasks),
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}
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