Python制作签到系统

import datetime
sign_in_records = {}

def sign_in(username):
    today = datetime.date.today()
    if username not in sign_in_records:
        sign_in_records[username] = []
    sign_in_records[username].append(today)
    print(f"{username} 签到成功！")

# 示例录入
sign_in("张三")
sign_in("李四")