Python 练习 [5] [自动售货系统]

题目:

代码:

# 商品属性
prize_default = [2, 3, 4, 5, 8, 6]
goods_info = {'A' + str(i+1): dict(prize=prize_default[i], quantity=0) for i in range(6)}
# 存钱盒信息
money_default = [1, 2, 5, 10]
moneybox_info = {money_default[i]: 0 for i in range(4)}
money_balance = 0# 投入累计
cmd_list = ['r', 'p', 'b', 'c', 'q']# 命令类型
cmd_in_all=[]# 命令仓
refund_coin=[]# 退币仓
# 命令拆分并执行
def cmd_exec():
    cmd_in = input()
    if (cmd_in[0] not in cmd_list) or not cmd_in.endswith(';'): # 输入命令不合法提示并返回
        print('invalid cmd')
        return
    cmd_in_all = cmd_in.rstrip(';').split(';')# 多个命令分割
    for i in cmd_in_all: # 多个命令依次执行
        cmd_choice(i)
    cmd_in_all=[] # 清空命令仓
# 输入命令并判断
def cmd_choice(cmd_in):
    if cmd_in[0] not in cmd_list: # 命令不合法提示并返回
        print('invalid cmd')
        return
    else: # 命令合法执行相应命令
        cmd_def[cmd_list.index(cmd_in[0])](cmd_in.lstrip(cmd_in[0] + ' '))
# 信息初始化 r
def info_init(input_info):
    init_info = input_info.split(' ') # 从空格处断开分出两个字符串
    # 限制输入数据的范围
    for i in init_info:  # 遍历两个字符串
        for j in i.split('-'): # 从字符串中提出数字信息
            if int(j)> 10: # 如果单个赋值超过 10, 输出提示信息
                print('out of range , Initialization failed')
                return
    for i,v in zip(goods_info,init_info[0].split('-')): # 存入商品数量
        goods_info[i]['quantity'] = int(v)
    for i,v in zip(money_default,init_info[1].split('-')): # 存入钱币数量
        moneybox_info[i] = int(v)
    print('S001:Initialization is successful') # 初始化成功信息
# 投币 p
def put_in_money(money):
    global money_balance
    money = int(money) # 将字符串转成数值
    if money not in money_default: # 投入不是 10,5,2,1 的硬币报错并返回
        print('E002:Denomination error')
        return
    if money != 1 and money != 2: # 1,2 硬币不适用下面规则
        if money> moneybox_info[2] * 2 + moneybox_info[1] * 1: # 投入硬币大于盒内 2,1 硬币的总数时报错并返回
            print('E003:Change is not enough,pay fail')
            return
    if money_balance> 10: # 余额大于 10 时报错并返回
        print('E004:Pay the balance is beyond the scope biggest')
        return
    for i in goods_info: # 遍历货物数量
        if goods_info[i]['quantity'] != 0: # 有货跳出循环
            break
    else: # 没货报错并返回
        print('E005:All the goods sold out')
        return
    money_balance += money # 成功投币计入余额
    moneybox_info[money] += 1 # 投入币放入存钱盒
    print('S002:Pay success,balance='+str(money_balance)) # 成功提示
# 购买商品 b
def buy(goods):
    global money_balance
    if goods not in goods_info: # 商品不存在提示并返回
        print('E0:Goods does not exist')
        return
    if goods_info[goods]['quantity']==0: # 商品数量为 0 提示并返回
        print('E007:The goods sold out')
        return
    if money_balance<goods_info[goods]['prize']: # 余额不足提示并返回
        print('E008:Lack of balance')
        return
    money_balance-=goods_info[goods]['prize'] # 成功余额减少
    goods_info[goods]['quantity']-=1 # 成功数量减一
    print('S003:Buy success,balance='+str(money_balance)) # 购买成功提示
# 退币 c
def refund(*arg):
    global money_balance
    global refund_coin
    if money_balance==0: # 余额为 0 时提示并返回
        print('E009:Works failure')
        return
    else:
        for i in money_default[::-1]: # 余额不为 0 时, 从高到低遍历存钱盒里的硬币
            while moneybox_info[i]!=0 and money_balance>= i: # 当余额大于该面值硬币且该硬币数大于 0 时
                refund_coin.append(i) # 将要退回的硬币存入列表
                money_balance-=i # 余额减去对应值
                moneybox_info[i]-=1 # 存钱盒内该类硬币数量减去 1
        else:
            coin_back=[refund_coin.count(i) for i in money_default]
            # 统计应退各类硬币数
            print(coin_back)
            for i in range(4): # 打印退币信息
                print(money_default[i],'yuan coin number='+str(coin_back[i]))
            refund_coin=[] # 情况退币仓
# 查询库存及存钱盒信息 q
def inquire(cmd):
    if cmd=='0': # 查询商品信息
        for i in sorted(goods_info.items(),key=lambda a:a[1]['quantity'],reverse=True):
            print(i[0],i[1]['prize'],i[1]['quantity'])
    if cmd=='1': # 查询存钱盒信息
        for i in money_default:  # 打印退币信息
            print(str(i), 'yuan coin number=' + str(moneybox_info[i]))
# 命令对应函数列表
cmd_def = [info_init, put_in_money, buy, refund, inquire]
while True:
    try:
        cmd_exec()
    except Exception as error:
        print('system exception')

测试结果:

初始化:

投币:

购买:

退币:

查询:

多命令:

来源: http://www.bubuko.com/infodetail-2883578.html