四个python面试自己的解答

Dear 丶 2022-10-05 10:52 123阅读 0赞

共两题，要求为纸上写代码，总时间 30 min，请合理分配时间  
（若在线答题，要求在注释中阐述设计思路，这样做的优缺点)

1，实现函数，输入字符串，输出其对应的对象：

Input:
    string1 = '["ITEM0001 x 1", "ITEM0013 x 2", "ITEM0022 x 1"]'
    
    Output:
    obj1 = {
        "ITEM0001": 1,
        "ITEM0013": 2,
        "ITEM0022": 1,
    }

2，在上题的基础上，增加额外信息  
ITEM 指的是商品：  
ITEM0001 的价格 为 10；  
ITEM0013 的价格 为 20；  
ITEM0022 的价格 为 30。

Input:
    string1 = '["ITEM0001 x 1", "ITEM0013 x 2", "ITEM0022 x 1"]'
    
    Output:
    80
    
    
    Input:
    string1 = '["ITEM0006 x 1"]'
    
    Output:
    "ITEM 不合法！"

3，「附加题」在上两题的基础上，增加额外信息  
优惠 1：  
同时购买 ITEM0001 和 ITEM0022，则该商品半价

优惠 2：  
满 100 减 30

优惠只能选一种。自动计算多种优惠的结果，并输出最优结果。

Input:
    string1 = '["ITEM0001 x 1", "ITEM0013 x 2", "ITEM0022 x 1"]'
    
    Output:
    60
    "优惠 1"
    
    Input:
    string1 = '["ITEM0001 x 1", "ITEM0013 x 3", "ITEM0022 x 1"]'
    
    Output:
    70
    "优惠 2"

4，mongodb 数据库表设计：  
将第 2 题的商品表放到数据库中，  
将第 3 题的优惠结果放到数据库中。

# -*- coding: utf-8 -*-
    # @Author : Fengqi(jmps515@163.com)
    # @Time : 2021/6/8 下午1:54
    # @File : test.py
    # @Software: PyCharm
    # @Python : 3.6
    
    import pymongo
    
    # 封装数据库函数
    class Mongodb(object):
        def __init__(self):
            self.mongo_url = 'localhost'
            self.mongo_db = 'goods'
            self.client = pymongo.MongoClient(self.mongo_url)
            self.db = self.client[self.mongo_db]
    
        # 插入字典数据
        def process_item(self, item):
            tablename = 'goods'
            self.db[tablename].insert(dict(item))
    
    
        # 插入单列数据
        def insert_record(self, record):
            tablename = 'record'
            self.db[tablename].insert({ 'record': record})
    
    
        def close_client(self):
            self.client.close()
    
    
    valid_item = { "ITEM0001": 10, "ITEM0013": 20, "ITEM0022": 30}
    
    
    # 字符串转商品
    def devide_goods_num(goods):
        good_list = eval(goods)
        obj = { }
        for i in good_list:
            goods_name, num = i.split('x')
            goods_name = goods_name.strip()
            if goods_name in valid_item:
                obj[goods_name] = int(num)
            else:
                print('ITEM[%s] 不合法' % goods_name)
        return obj
    
    # 全价商品
    def get_price(obj):
        price = 0
        for key, value in obj.items():
            if key in valid_item:
                price += valid_item[key] * value
            else:
                print('ITEM[%s] 不合法' % key)
    
        return price
    
    # 优惠规则1
    def rules_1(obj):
        valid_item = { "ITEM0001": 10, "ITEM0013": 20, "ITEM0022": 30}
        discount_items = ['ITEM0001', 'ITEM0022']
        price = 0
        if set(discount_items) < set(obj.keys()):
            for key, value in obj.items():
                if key in valid_item:
                    if key in discount_items:
                        price += valid_item[key] * value / 2
                    else:
                        price += valid_item[key] * value
                else:
                    print('ITEM[%s] 不合法' % key)
                    return
            return price
        else:
            return
    
    # 优惠规则2
    def rules_2(obj):
        discount_price = 30
        total = get_price(obj)
        return total if total < 100 else total-discount_price
    
    # 折扣价格
    def get_discount(obj):
        return min(rules_1(obj), rules_2(obj))
    
    
    
    def test1():
        string1 = '["ITEM0001 x 1", "ITEM0013 x 2", "ITEM0022 x 1"]'
        print(devide_goods_num(string1))
        print('test 1 end')
    
    
    def test2():
        string1 = '["ITEM0002 x 1", "ITEM0013 x 2", "ITEM0022 x 1"]'
        obj = devide_goods_num(string1)
        print(get_price(obj))
        print('test 2 end')
    
    
    def test3():
    
        string1 = ['["ITEM0001 x 1", "ITEM0013 x 2", "ITEM0022 x 1"]', '["ITEM0001 x 1", "ITEM0013 x 3", "ITEM0022 x 1"]']
        for goods in string1:
            obj = devide_goods_num(goods)
            discount_price = get_discount(obj)
            print('discount price is %d' % discount_price)
    
        print('test 3 end')
    
    def test4():
        string1 = '["ITEM0002 x 1", "ITEM0013 x 2", "ITEM0022 x 1"]'
        obj = devide_goods_num(string1)
        my_db = Mongodb()
        my_db.process_item(obj)
    
        string1 = ['["ITEM0001 x 1", "ITEM0013 x 2", "ITEM0022 x 1"]', '["ITEM0001 x 1", "ITEM0013 x 3", "ITEM0022 x 1"]']
        for goods in string1:
            obj = devide_goods_num(goods)
            discount_price = get_discount(obj)
            record = ('discount price is %d' % discount_price)
            print('discount price is %d' % discount_price)
            my_db.insert_record(record)
    
    
    test1()
    test2()
    test3()
    test4()