已知某company有员工30人，分三类：WeekWorker每周580￥,MonthWorker月薪每月2500 ￥ ，YearWorker年薪每年22000 ￥ 。 已知有Employee类，有成员函数earning()用于计算Employee一年的收入。在conmpany类中有Employee[]存放公司员工，成员函数salariesPay()计算并打印公司的所有一年薪水之和。 请编写类Company，Employee,WeekWorker,MonthWorker,YearWorker，假定公司三类员工各自的数量用随机数来模拟，打印该公司一年的薪水支出。

以下是代码实现：

import random

class Employee:
    def earning(self):
        pass

class WeekWorker(Employee):
    def __init__(self, salary=580 * 52):
        self.salary = salary
        
    def earning(self):
        return self.salary

class MonthWorker(Employee):
    def __init__(self, salary=2500 * 12):
        self.salary = salary
        
    def earning(self):
        return self.salary

class YearWorker(Employee):
    def __init__(self, salary=22000):
        self.salary = salary
        
    def earning(self):
        return self.salary

class Company:
    def __init__(self):
        self.employees = []
        self.generateEmployees()

    def generateEmployees(self):
        weekWorkerNum = random.randint(1, 10)
        monthWorkerNum = random.randint(1, 10)
        yearWorkerNum = random.randint(1, 10)

        for i in range(weekWorkerNum):
            self.employees.append(WeekWorker())

        for i in range(monthWorkerNum):
            self.employees.append(MonthWorker())

        for i in range(yearWorkerNum):
            self.employees.append(YearWorker())

    def salariesPay(self):
        sum = 0
        for employee in self.employees:
            sum += employee.earning()
        print("The company's total salaries pay is: ", sum)

if __name__ == '__main__':
    company = Company()
    company.salariesPay()

在上述代码中，我们定义了三个员工类 WeekWorker、MonthWorker 和 YearWorker，它们分别对应每周、每月和每年的薪水收入。在 Company 类中，我们通过随机数生成了公司的员工数量，并将这些员工添加到了一个 employees 的列表中。最后，我们调用 salariesPay 函数计算并打印出公司的总薪水支出。