Python中的电梯模拟器。

Question

我需要一个python中的电梯模拟器的帮助，我没有太多的经验。应该有用户输入的具有随机起始楼层和目的楼层的客户数量。现在我只是编写了一个简单的策略，电梯一直到顶部，然后再回到底部。当我运行代码时，程序无限循环。我不明白为什么。另外，我不知道如何编写大楼的输出方法，我想显示哪些客户有哪些楼层，电梯访问了多少楼层。谢谢你的帮助。

import random

class Elevator(object):
    def __init__(self, num_of_floors, register_list, direction = "up", cur_floor=1):
        self.total_floors = num_of_floors
        self.reg_list = register_list
        self.floor = cur_floor
        self.direct = direction
    def move(self):
        """Moves the elevator one floor"""
        if self.total_floors == self.floor:
            self.direct = "down"
        if self.direct == "up":
            self.floor += 1
        else:
            self.floor -= 1
    def register_customer(self, customer):
        self.reg_list.append(customer)
    def cancel_customer(self, customer):
        self.reg_list.remove(customer)

class Building(object):
    def __init__(self, num_of_floors, customer_list, elevator):
        self.total_floors = num_of_floors
        self.customers = customer_list
    def run(self):
        while elevator.floor != 0:
            for customer in self.customers:
                if elevator.floor == customer.on_floor:
                    elevator.reg_list.append(customer)
                    customer.indicator = 1
                elif elevator.floor == customer.going_floor:
                    elevator.reg_list.remove(customer)
                    customer.indicator = 0
                    customer.fin = 1
            elevator.move()

    def output(self):
        pass

class Customer(object):
    def __init__(self, ID, num_of_floors, cur_floor=0, dst_floor=0, in_elevator=0, finished=0):
        self.ident = ID
        self.indicator = in_elevator
        self.fin = finished
        cur_floor = random.randint(1, num_of_floors)
        self.on_floor = cur_floor
        dst_floor = random.randint(1, num_of_floors)
        while dst_floor == cur_floor:
            dst_floor = random.randint(1, num_of_floors)
        self.going_floor = dst_floor


customer_count = int(input("How many customers are in the building?: "))
floor_count = int(input("How many floors does the building have?: "))
cus_list = []
for i in range(1, customer_count+1):
    cus_list.append(Customer(i, floor_count))
elevator = Elevator(floor_count, cus_list)
building = Building(floor_count, cus_list, elevator)

Answer 1

你的问题在于：

def run(self):
    while elevator.floor != 0:
        print(elevator.floor)
        for customer in self.customers:
            print(customer)
            if elevator.floor == customer.on_floor:
                elevator.reg_list.append(customer)
                customer.indicator = 1
            elif elevator.floor == customer.going_floor:
                elevator.reg_list.remove(customer)
                customer.indicator = 0
                customer.fin = 1
        elevator.move()

当您执行elevator.reg_list.append（customer）时，您将把客户重新附加到列表中，增加它的大小（self.customers也是对同一列表的引用），因此“for customer in self.customers”将永远循环。

让我们跟随“cus_list”：

elevator = Elevator(floor_count, cus_list)
building = Building(floor_count, cus_list, elevator)

class Building(object):
    def __init__(self, num_of_floors, customer_list, elevator):
        self.total_floors = num_of_floors
        self.customers = customer_list

class Elevator(object):
    def __init__(self, num_of_floors, register_list, direction = "up", cur_floor=1):
        self.total_floors = num_of_floors
        self.reg_list = register_list # <-------- THIS IS "cus_list" reference

最后在课堂上：

 elevator.reg_list.append(customer)

电梯是一个全局变量，这里创建的范围超出了类FYI。

修复可能如下所示

电梯是空的，对吧？

class Elevator(object):
    def __init__(self, num_of_floors, register_list, direction = "up", cur_floor=1):
        self.total_floors = num_of_floors
        self.reg_list = []