四个python面试自己的解答
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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()
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