Python 实战：时间管理系统

from datetime import datetimeclass Task:def __init__(self,  , due_date):self.  =  self.due_date = due_dateself.completed = Falsedef mark_completed(self):self.completed = Truedef __str__(self):status = 'Completed' if self.completed else 'Pending'return f'Task: {self. }, Due: {self.due_date}, Status: {status}'class TaskManager:def __init__(self):self.tasks = []def add_task(self, task):self.tasks.append(task)def delete_task(self,  ):self.tasks = [task for task in self.tasks if task.  !=  ]def get_all_tasks(self):return self.tasksdef get_pending_tasks(self):return [task for task in self.tasks if not task.completed]def get_completed_tasks(self):return [task for task in self.tasks if task.completed]# 示例代码if __name__ == '__main__':# 创建TaskManager实例manager = TaskManager()# 添加任务manager.add_task(Task('Finish project', datetime(2024, 6, 20)))manager.add_task(Task('Prepare presentation', datetime(2024, 6, 18)))# 查看所有任务print('All Tasks:')for task in manager.get_all_tasks():print(task)# 完成任务tasks = manager.get_all_tasks()tasks[0].mark_completed()# 查看完成的任务print('\nCompleted Tasks:')for task in manager.get_completed_tasks():print(task)# 查看未完成的任务print('\nPending Tasks:')for task in manager.get_pending_tasks():print(task)# 删除任务manager.delete_task('Prepare presentation')# 查看所有任务print('\nAll Tasks after deletion:')for task in manager.get_all_tasks():print(task)

# 练习1：根据截止日期排序任务def sort_tasks_by_due_date(self):self.tasks.sort(key=lambda task: task.due_date)# 练习2：更新任务的截止日期classTask:# ... 原有代码 ...defupdate_due_date(self,new_due_date):self.due_date= new_due_date# 练习3：根据任务标题搜索任务def search_task_by_ (self,  ):return[taskfortaskinself.tasksif .lower()intask. .lower()]