来实现：

方式一：使用列表存储员工信息

employees = [ {"id": "001", "name": "张三", "age": 25, "hire_date": "2021-01-01"}, {"id": "002", "name": "李四", "age": 30, "hire_date": "2020-01-01"}, {"id": "003", "name": "王五", "age": 35, "hire_date": "2019-01-01"} ]

打印所有员工姓名

for employee in employees: print(employee["name"])

输出员工的个数

print("员工的个数为：", len(employees))

方式二：使用字典存储员工信息

employee_1 = {"id": "001", "name": "张三", "age": 25, "hire_date": "2021-01-01"} employee_2 = {"id": "002", "name": "李四", "age": 30, "hire_date": "2020-01-01"} employee_3 = {"id": "003", "name": "王五", "age": 35, "hire_date": "2019-01-01"}

employees = { "001": employee_1, "002": employee_2, "003": employee_3 }

打印所有员工姓名

for employee in employees.values(): print(employee["name"])

输出员工的个数

print("员工的个数为：", len(employees))

方式三：使用类存储员工信息

class Employee: def init(self, id, name, age, hire_date): self.id = id self.name = name self.age = age self.hire_date = hire_date

employee_1 = Employee("001", "张三", 25, "2021-01-01") employee_2 = Employee("002", "李四", 30, "2020-01-01") employee_3 = Employee("003", "王五", 35, "2019-01-01")

employees = [employee_1, employee_2, employee_3]

打印所有员工姓名

for employee in employees: print(employee.name)

输出员工的个数

print("员工的个数为：", len(employees)