如何通过员工的HireDate和TerminationDate来获取最大的员工数量？

import datetime

# 假设从数据库中获取的数据存储在一个名为"employees"的列表中
employees = [
    {"hire_date": datetime.date(2020, 1, 1), "termination_date": datetime.date(2022, 6, 30)},
    {"hire_date": datetime.date(2019, 3, 15), "termination_date": datetime.date(2021, 12, 31)},
    {"hire_date": datetime.date(2021, 7, 1), "termination_date": None},
    # 其他员工数据...
]

# 初始化变量
max_employees = 0
max_date = None

# 遍历员工数据，计算每个日期的员工数量
for employee in employees:
    hire_date = employee["hire_date"]
    termination_date = employee["termination_date"]

    # 如果员工没有离职日期，则将其设置为当前日期
    if termination_date is None:
        termination_date = datetime.date.today()

    # 计算员工数量
    num_employees = sum(1 for emp in employees if hire_date <= emp["hire_date"] <= termination_date)

    # 更新最大员工数量和对应的日期
    if num_employees > max_employees:
        max_employees = num_employees
        max_date = hire_date

# 打印结果
print("最大员工数量：", max_employees)
print("对应日期：", max_date)