实验三 控制语句与组合数据类型应用编程
实验任务1
task1:
源代码：
1 import random 2 3 print('用列表储存随机整数：') 4 lst = [random.randint(0,100) for i in range(5)] 5 print(lst) 6 7 print('\n用集合储存随机整数：') 8 s1 = {random.randint(0,100) for i in range(5)} 9 print(s1) 10 11 print('\n用集合储存随机整数：') 12 s2 = set() 13 while len(s2) < 5: 14 s2.add(random.randint(0,100)) 15 print(s2)
运行结果：
问题：
问题1： random.randint(0,100) 生成的随机整数范围是？ 范围：0~99
能否取到100？ 取不到。
问题2：利用 list(range(5)) 生成的有序序列范围是？ 0~4
是否包括5？ 不包括。
利用 list(range(1,5)) 生成的有序序列范围是？ [0,1,2,3,4]
是否包括5？ 不包括。
问题3：使用line8代码生成的集合s1，len(s1)一定是5吗？如果不是，请解释原因。 是。
问题4：使用line12-14生成的集合s2，len(s2)一定是5吗？如果不是，请解释原因。 是。
实验任务2
task2：
2.1源代码：
1 # 列表遍历 2 lst = [55,92,88,79,96] 3 4 # 遍历方式1: 使用while + 索引 5 i = 0 6 while i < len(lst): 7 print(lst[i],end = ' ') 8 i += 1 9 10 print() 11 12 # 遍历方式2：使用for + 索引 13 for i in range(len(lst)): 14 print(lst[i],end = ' ') 15 print() 16 17 # 遍历方式3： 使用for...in 18 for i in lst: 19 print(i,end = ' ') 20 print()
2.1运行结果：
2.2源代码：
1 # 字典遍历 2 book_info = {'isbn': '978-7-5356-8297-0', 3 '书名': '白鲸记', 4 '作者': '克里斯多夫.夏布特', 5 '译者': '高文婧', 6 '出版社': '湖南美术出版社', 7 '售价': 82 8 } 9 # 遍历key-value对：实现方式1 10 for key, value in book_info.items(): 11 print(f'{key}:{value}') 12 print() 13 14 # 遍历key-value对：实现方式2 15 for item in book_info.items(): 16 print(f'{item[0]}:{item[1]}') 17 print() 18 19 # 遍历值：实现方式1 20 for value in book_info.values(): 21 print(value, end = ' ') 22 print() 23 24 # 遍历值: 实现方式2 25 for key in book_info.keys(): 26 print(book_info[key], end = ' ')
2.2运行结果：
2.3源代码：
1 book_infos = [{'书名': '昨日的世界', '作者': '斯蒂芬.茨威格'}, 2 {'书名': '局外人', '作者': '阿尔贝.加缪'}, 3 {'书名': '设计中的设计', '作者': '原研哉'}, 4 {'书名': '万历十五年', '作者': '黄仁宇'}, 5 {'书名': '刀锋', '作者': '毛姆'} 6 ] 7 i = 0 8 while i < 5: 9 j = book_infos[i] 10 b = str(j['书名']) 11 j['书名'] = b.join('《》') 12 print(str(i+1)+"."+j['书名']+','+j['作者']) 13 i +=1
2.3运行结果：
实验任务3
task3:
源代码：
1 s = ''' 2 The Zen of Python, by Tim Peters 3 Beautiful is better than ugly. 4 Explicit is better than implicit. 5 Simple is better than complex. 6 Complex is better than complicated. 7 Flat is better than nested. 8 Sparse is better than dense. 9 Readability counts. 10 Special cases aren't special enough to break the rules. 11 Although practicality beats purity. 12 Errors should never pass silently. 13 Unless explicitly silenced. 14 In the face of ambiguity, refuse the temptation to guess. 15 There should be one-- and preferably only one --obvious way to do it. 16 Although that way may not be obvious at first unless you're Dutch. 17 Now is better than never. 18 Although never is often better than *right* now. 19 If the implementation is hard to explain, it's a bad idea. 20 If the implementation is easy to explain, it may be a good idea. 21 Namespaces are one honking great idea -- let's do more of those! 22 ''' 23 s1 = s.lower() 24 s2 = (chr(i) for i in range(97,123)) 25 ab = {} 26 for i in s2: 27 ab.setdefault(i,0) 28 29 for key in ab.keys(): 30 ab[key] = s1.count(key) 31 list1 = list(item for item in ab.items()) 32 list2 = [(value,key) for key, value in list1] 33 for value,key in sorted(list2,reverse = True): 34 print(f'{key}:{value}')
运行结果：
实验任务4：
task4:
源代码：
1 major = {8326:'地信类', 2 8329:'计算机类', 3 8330:'气科类', 4 8336:'防灾工程', 5 8345:'海洋科学', 6 8382:'气象工程'} 7 s1 = '专业代号信息' 8 s2 = '学生专业查询' 9 print(f'{s1:-^50}') 10 for key, value in major.items(): 11 print(f'{key}:{value}') 12 print(f'{s2:-^50}') 13 for i in major.keys(): 14 id = input('请输入学号：') 15 if id == '#': 16 print(f'查询结束...') 17 break 18 m = int(id[4:8]) 19 if m in major.keys(): 20 m2 = major[m] 21 print(f'专业是：{m2}') 22 pass 23 else: 24 print(f'不在这些专业中...') 25 pass
运行结果：
实验任务5
task5:
源代码：
1 import random 2 i = random.randint(1,31) 3 print(f'猜猜五月哪一天是你的lucky day\U0001F609') 4 day = eval(input('你有三次机会，猜吧(1~31)：')) 5 for j in range(2): 6 if day == i: 7 print('哇，猜中了\U0001F923') 8 break 9 elif day > i: 10 print('猜晚啦，你的lucky day已经过了。') 11 day = eval(input('再猜(1~31)：')) 12 pass 13 elif day < i: 14 print('猜早啦，你的lucky day还没到呢。') 15 day = eval(input('再猜(1~31)：')) 16 pass 17 print('哇哦，你的次数用光啦。') 18 print(f'偷偷告诉你，5月你的lucky day是{i}号。good luck\U0001F60A')
运行结果：
实验任务6
task6:
源代码：
1 datas = {'2049777001': ['篮球', '羽毛球', '美食', '漫画'], 2 '2049777002': ['音乐', '旅行'], 3 '2049777003': ['马拉松', '健身', '游戏'], 4 '2049777004': [], 5 '2049777005': ['足球', '阅读'], 6 '2049777006': ['发呆', '闲逛'], 7 '2049777007': [], 8 '2049777008': ['书法', '电影'], 9 '2049777009': ['音乐', '阅读', '电影', '漫画'], 10 '2049777010': ['数学', '推理', '音乐', '旅行'] 11 } 12 ih = set() 13 ih1 = list() 14 for value in datas.values(): 15 for i in value: 16 ih1.append(i) 17 ih.add(i) 18 19 ih2 = {} 20 for j in ih: 21 ih2.setdefault(j,0) 22 23 for y in ih1: 24 if y in ih2.keys(): 25 ih2[y] += 1 26 else: 27 pass 28 29 list1 = list(ih2.items()) 30 list2 = [(value, key) for key, value in list1] 31 for value, key in sorted(list2,reverse = True): 32 print(f'{key}:{value}')
运行结果：
实验任务7
task7-1:
源代码：
1 """ 2 家用电器销售系统 3 v1.3 4 """ 5 6 # 欢迎信息 7 print('欢迎使用家用电器销售系统！') 8 9 # 商品数据初始化 10 products = [ 11 ['0001', '电视机', '海尔', 5999.00, 20], 12 ['0002', '冰箱', '西门子', 6998.00, 15], 13 ['0003', '洗衣机', '小天鹅', 1999.00, 10], 14 ['0004', '空调', '格力', 3900.00, 0], 15 ['0005', '热水器', '美的', 688.00, 30], 16 ['0006', '笔记本', '联想', 5699.00, 10], 17 ['0007', '微波炉', '苏泊尔', 480.50, 33], 18 ['0008', '投影仪', '松下', 1250.00, 12], 19 ['0009', '吸尘器', '飞利浦', 999.00, 9], 20 ] 21 22 # 初始化用户购物车 23 products_cart = [] 24 25 option = input('请选择您的操作: 1-查看商品；2-购物；3-查看购物车；其他-结账') 26 while option in ['1','2','3']: 27 if option == '1': 28 # 产品信息列表 29 print('产品和价格信息如下：') 30 print('*'*60) 31 print('%-10s'%'编号','%-10s'%'名称','%-10s'%'品牌', 32 '%-10s'%'价格','%-10s'%'库存数量') 33 print('-'*60) 34 for i in range(len(products)): 35 print('%-10s'%products[i][0],'%-10s'%products[i][1],'%-10s'%products[i][2], 36 '%-10s'%products[i][3],'%-10s'%products[i][4]) 37 print('-'*60) 38 elif option == '2': 39 product_id = input('请输入您要购买的产品编号：') 40 while product_id not in [item[0] for item in products]: 41 product_id = input('编号不存在，请重新输入您要购买的产品编号：') 42 43 count = int(input('请输入您要购买的产品数量：')) 44 while count >products[int(product_id)-1][4]: 45 count = int(input('数量超出库存数量，请重新输入您要购买的产品数量：')) 46 47 # 将所购买商品加入购物车 48 if product_id not in [item[0] for item in products_cart]: 49 products_cart.append([product_id,count]) 50 51 else: 52 for i in range(len(products_cart)): 53 if products_cart[i][0] == product_id: 54 products_cart[i][1] += count 55 56 # 更新商品列表 57 for i in range(len(products)): 58 if products[i][0] == product_id: 59 products[i][4] -= count 60 61 else: 62 print('购物车信息如下：') 63 print('*'*30) 64 print('%-10s'%'编号','%-10s'%'购买数量') 65 print('-'*30) 66 for i in range(len(products_cart)): 67 print('%-10s'%products_cart[i][0],'%6d'%products_cart[i][1]) 68 print('-'*30) 69 option = input('操作成功！请选择您的操作：1-查看商品；2-购物；3-查看购物车；其他-结账') 70 71 # 计算金额 72 if len(products_cart) > 0: 73 amount = 0 74 for i in range(len(products_cart)): 75 product_index = 0 76 for j in range(len(products)): 77 if products[j][0] == products_cart[i][0]: 78 product_index = j 79 break 80 price = products[product_index][3] 81 count = products_cart[i][1] 82 amount += price*count 83 84 if 5000<amount <= 10000: 85 amount = amount*0.95 86 elif 10000<amount <= 20000: 87 amount = amount*0.9 88 elif amount>20000: 89 amount = amount*0.85 90 else: 91 amount = amount*1 92 93 print('购买成功，您需要支付%8.2f元'%amount) 94 95 # 退出系统 96 print('谢谢您的光临，下次再见！')
运行结果：
task7-2:
str.format:
源代码：
1 """ 2 家用电器销售系统 3 v1.3 4 """ 5 6 # 欢迎信息 7 print('欢迎使用家用电器销售系统！') 8 9 # 商品数据初始化 10 products = [ 11 ['0001', '电视机', '海尔', 5999.00, 20], 12 ['0002', '冰箱', '西门子', 6998.00, 15], 13 ['0003', '洗衣机', '小天鹅', 1999.00, 10], 14 ['0004', '空调', '格力', 3900.00, 0], 15 ['0005', '热水器', '美的', 688.00, 30], 16 ['0006', '笔记本', '联想', 5699.00, 10], 17 ['0007', '微波炉', '苏泊尔', 480.50, 33], 18 ['0008', '投影仪', '松下', 1250.00, 12], 19 ['0009', '吸尘器', '飞利浦', 999.00, 9], 20 ] 21 22 # 初始化用户购物车 23 products_cart = [] 24 25 option = input('请选择您的操作: 1-查看商品；2-购物；3-查看购物车；其他-结账') 26 while option in ['1','2','3']: 27 if option == '1': 28 # 产品信息列表 29 print('产品和价格信息如下：') 30 print('*'*60) 31 print('{:<10s}'.format('编号'),'{:<10s}'.format('名称'),'{:<10s}'.format('品牌'), 32 '{:<10s}'.format('价格'),'{:<10s}'.format('库存数量')) 33 print('-'*60) 34 for i in range(len(products)): 35 print('{:<10s}'.format(products[i][0]), 36 '{:<10s}'.format(products[i][1]), 37 '{:<10s}'.format(products[i][2]), 38 '{:<10.2f}'.format(products[i][3]), 39 '{:<10d}'.format(products[i][4])) 40 print('-'*60) 41 elif option == '2': 42 product_id = input('请输入您要购买的产品编号：') 43 while product_id not in [item[0] for item in products]: 44 product_id = input('编号不存在，请重新输入您要购买的产品编号：') 45 46 count = int(input('请输入您要购买的产品数量：')) 47 while count >products[int(product_id)-1][4]: 48 count = int(input('数量超出库存数量，请重新输入您要购买的产品数量：')) 49 50 # 将所购买商品加入购物车 51 if product_id not in [item[0] for item in products_cart]: 52 products_cart.append([product_id,count]) 53 54 else: 55 for i in range(len(products_cart)): 56 if products_cart[i][0] == product_id: 57 products_cart[i][1] += count 58 59 # 更新商品列表 60 for i in range(len(products)): 61 if products[i][0] == product_id: 62 products[i][4] -= count 63 64 else: 65 print('购物车信息如下：') 66 print('*'*30) 67 print('{:<10s}'.format('编号'),'{:<10s}'.format('购买数量')) 68 print('-'*30) 69 for i in range(len(products_cart)): 70 print('{:<10s}'.format(products_cart[i][0]),'{:6d}'.format(products_cart[i][1])) 71 print('-'*30) 72 option = input('操作成功！请选择您的操作：1-查看商品；2-购物；3-查看购物车；其他-结账') 73 74 # 计算金额 75 if len(products_cart) > 0: 76 amount = 0 77 for i in range(len(products_cart)): 78 product_index = 0 79 for j in range(len(products)): 80 if products[j][0] == products_cart[i][0]: 81 product_index = j 82 break 83 price = products[product_index][3] 84 count = products_cart[i][1] 85 amount += price*count 86 87 if 5000<amount <= 10000: 88 amount = amount*0.95 89 elif 10000<amount <= 20000: 90 amount = amount*0.9 91 elif amount>20000: 92 amount = amount*0.85 93 else: 94 amount = amount*1 95 96 print('购买成功，您需要支付{:<8.2f}元'.format(amount)) 97 98 # 退出系统 99 print('谢谢您的光临，下次再见！')
运行结果：
task7-3:
f-string:
源代码：
1 """ 2 家用电器销售系统 3 v1.3 4 """ 5 6 # 欢迎信息 7 print('欢迎使用家用电器销售系统！') 8 9 # 商品数据初始化 10 products = [ 11 ['0001', '电视机', '海尔', 5999.00, 20], 12 ['0002', '冰箱', '西门子', 6998.00, 15], 13 ['0003', '洗衣机', '小天鹅', 1999.00, 10], 14 ['0004', '空调', '格力', 3900.00, 0], 15 ['0005', '热水器', '美的', 688.00, 30], 16 ['0006', '笔记本', '联想', 5699.00, 10], 17 ['0007', '微波炉', '苏泊尔', 480.50, 33], 18 ['0008', '投影仪', '松下', 1250.00, 12], 19 ['0009', '吸尘器', '飞利浦', 999.00, 9], 20 ] 21 22 # 初始化用户购物车 23 products_cart = [] 24 25 option = input('请选择您的操作: 1-查看商品；2-购物；3-查看购物车；其他-结账') 26 while option in ['1','2','3']: 27 if option == '1': 28 # 产品信息列表 29 print('产品和价格信息如下：') 30 print('*'*60) 31 a = ['编号','名称','品牌','价格','库存数量','购买数量'] 32 print(f'{a[0]:10s}{a[1]:10s}{a[2]:10s}{a[3]:10s}{a[4]:10s}') 33 print('-'*60) 34 for i in range(len(products)): 35 print(f'{products[i][0]:10s}{products[i][1]:10s}{products[i][2]:10s}{products[i][3]:10.2f}{products[i][4]:10d}') 36 print('-'*60) 37 elif option == '2': 38 product_id = input('请输入您要购买的产品编号：') 39 while product_id not in [item[0] for item in products]: 40 product_id = input('编号不存在，请重新输入您要购买的产品编号：') 41 42 count = int(input('请输入您要购买的产品数量：')) 43 while count >products[int(product_id)-1][4]: 44 count = int(input('数量超出库存数量，请重新输入您要购买的产品数量：')) 45 46 # 将所购买商品加入购物车 47 if product_id not in [item[0] for item in products_cart]: 48 products_cart.append([product_id,count]) 49 50 else: 51 for i in range(len(products_cart)): 52 if products_cart[i][0] == product_id: 53 products_cart[i][1] += count 54 55 # 更新商品列表 56 for i in range(len(products)): 57 if products[i][0] == product_id: 58 products[i][4] -= count 59 60 else: 61 print('购物车信息如下：') 62 print('*'*30) 63 print(f'{a[0]:10s}{a[5]:10s}') 64 print('-'*30) 65 for i in range(len(products_cart)): 66 print(f'{products_cart[i][0]:10s}{products_cart[i][1]:6d}') 67 print('-'*30) 68 option = input('操作成功！请选择您的操作：1-查看商品；2-购物；3-查看购物车；其他-结账') 69 70 # 计算金额 71 if len(products_cart) > 0: 72 amount = 0 73 for i in range(len(products_cart)): 74 product_index = 0 75 for j in range(len(products)): 76 if products[j][0] == products_cart[i][0]: 77 product_index = j 78 break 79 price = products[product_index][3] 80 count = products_cart[i][1] 81 amount += price*count 82 83 if 5000<amount <= 10000: 84 amount = amount*0.95 85 elif 10000<amount <= 20000: 86 amount = amount*0.9 87 elif amount>20000: 88 amount = amount*0.85 89 else: 90 amount = amount*1 91 92 print(f'购买成功，您需要支付{amount:8.2f}元') 93 94 # 退出系统 95 print('谢谢您的光临，下次再见！')
运行结果：
实验任务8
task8-1:
源代码：
1 """ 2 家用电器销售系统 3 v1.4 4 """ 5 6 # 欢迎信息 7 print('欢迎使用家用电器销售系统！') 8 9 # 商品数据初始化 10 products = [ 11 {'id':'0001', 'name':'电视机', 'brand':'海尔', 'price':5999.00, 'count':20}, 12 {'id':'0002', 'name':'冰箱', 'brand':'西门子', 'price':6998.00, 'count':15}, 13 {'id':'0003', 'name':'洗衣机', 'brand':'小天鹅', 'price':1999.00, 'count':10}, 14 {'id':'0004', 'name':'空调', 'brand':'格力', 'price':3900.00, 'count':0}, 15 {'id':'0005', 'name':'热水器', 'brand':'美的', 'price':688.00, 'count':30}, 16 {'id':'0006', 'name':'笔记本', 'brand':'联想', 'price':5699.00, 'count':10}, 17 {'id':'0007', 'name':'微波炉', 'brand':'苏泊尔', 'price':480.50, 'count':33}, 18 {'id':'0008', 'name':'投影仪', 'brand':'松下', 'price':1250.00, 'count':12}, 19 {'id':'0009', 'name':'吸尘器', 'brand':'飞利浦', 'price':999.00, 'count':9}, 20 ] 21 22 # 初始化用户购物车 23 products_cart = [] 24 25 option = input('请选择您的操作: 1-查看商品；2-购物；3-查看购物车；其他-结账') 26 while option in ['1','2','3']: 27 if option == '1': 28 # 产品信息列表 29 print('产品和价格信息如下：') 30 print('*'*60) 31 print('%-10s'%'编号','%-10s'%'名称','%-10s'%'品牌', 32 '%-10s'%'价格','%-10s'%'库存数量') 33 print('-'*60) 34 for i in range(len(products)): 35 print('%-10s'%products[i]['id'], 36 '%-10s'%products[i]['name'], 37 '%-10s'%products[i]['brand'], 38 '%-10s'%products[i]['price'], 39 '%-10s'%products[i]['count']) 40 print('-'*60) 41 elif option == '2': 42 product_id = input('请输入您要购买的产品编号：') 43 while product_id not in [item['id'] for item in products]: 44 product_id = input('编号不存在，请重新输入您要购买的产品编号：') 45 46 count = int(input('请输入您要购买的产品数量：')) 47 while count >products[int(product_id)-1]['count']: 48 count = int(input('数量超出库存数量，请重新输入您要购买的产品数量：')) 49 50 # 将所购买商品加入购物车 51 if product_id not in [item['id'] for item in products_cart]: 52 products_cart.append({'id':product_id,'count':count}) 53 54 else: 55 for i in range(len(products_cart)): 56 if products_cart[i].get('id') == product_id: 57 products_cart[i]['count'] += count 58 59 # 更新商品列表 60 for i in range(len(products)): 61 if products[i]['id'] == product_id: 62 products[i]['count'] -= count 63 64 else: 65 print('购物车信息如下：') 66 print('*'*30) 67 print('%-10s'%'编号','%-10s'%'购买数量') 68 print('-'*30) 69 for i in range(len(products_cart)): 70 print('%-10s'%products_cart[i]['id'],'%6d'%products_cart[i]['count']) 71 print('-'*30) 72 option = input('操作成功！请选择您的操作：1-查看商品；2-购物；3-查看购物车；其他-结账') 73 74 # 计算金额 75 if len(products_cart) > 0: 76 amount = 0 77 for i in range(len(products_cart)): 78 product_index = 0 79 for j in range(len(products)): 80 if products[j]['id'] == products_cart[i]['id']: 81 product_index = j 82 break 83 price = products[product_index]['price'] 84 count = products_cart[i]['count'] 85 amount += price*count 86 87 if 5000<amount <= 10000: 88 amount = amount*0.95 89 elif 10000<amount <= 20000: 90 amount = amount*0.9 91 elif amount>20000: 92 amount = amount*0.85 93 else: 94 amount = amount*1 95 96 print('购买成功，您需要支付%8.2f元'%amount) 97 98 # 退出系统 99 print('谢谢您的光临，下次再见！')
运行结果：
task8-2:
str.format：
源代码：
1 """ 2 家用电器销售系统 3 v1.4 4 """ 5 6 # 欢迎信息 7 print('欢迎使用家用电器销售系统！') 8 9 # 商品数据初始化 10 products = [ 11 {'id':'0001', 'name':'电视机', 'brand':'海尔', 'price':5999.00, 'count':20}, 12 {'id':'0002', 'name':'冰箱', 'brand':'西门子', 'price':6998.00, 'count':15}, 13 {'id':'0003', 'name':'洗衣机', 'brand':'小天鹅', 'price':1999.00, 'count':10}, 14 {'id':'0004', 'name':'空调', 'brand':'格力', 'price':3900.00, 'count':0}, 15 {'id':'0005', 'name':'热水器', 'brand':'美的', 'price':688.00, 'count':30}, 16 {'id':'0006', 'name':'笔记本', 'brand':'联想', 'price':5699.00, 'count':10}, 17 {'id':'0007', 'name':'微波炉', 'brand':'苏泊尔', 'price':480.50, 'count':33}, 18 {'id':'0008', 'name':'投影仪', 'brand':'松下', 'price':1250.00, 'count':12}, 19 {'id':'0009', 'name':'吸尘器', 'brand':'飞利浦', 'price':999.00, 'count':9}, 20 ] 21 22 # 初始化用户购物车 23 products_cart = [] 24 25 option = input('请选择您的操作: 1-查看商品；2-购物；3-查看购物车；其他-结账') 26 while option in ['1','2','3']: 27 if option == '1': 28 # 产品信息列表 29 print('产品和价格信息如下：') 30 print('*'*60) 31 print('{:<10s}'.format('编号'),'{:<10s}'.format('名称'),'{:<10s}'.format('品牌'), 32 '{:<10s}'.format('价格'),'{:<10s}'.format('库存数量')) 33 print('-'*60) 34 for i in range(len(products)): 35 print('{:<10s}'.format(products[i]['id']), 36 '{:<10s}'.format(products[i]['name']), 37 '{:<10s}'.format(products[i]['brand']), 38 '{:<10.2f}'.format(products[i]['price']), 39 '{:<10d}'.format(products[i]['count'])) 40 print('-'*60) 41 elif option == '2': 42 product_id = input('请输入您要购买的产品编号：') 43 while product_id not in [item['id'] for item in products]: 44 product_id = input('编号不存在，请重新输入您要购买的产品编号：') 45 46 count = int(input('请输入您要购买的产品数量：')) 47 while count >products[int(product_id)-1]['count']: 48 count = int(input('数量超出库存数量，请重新输入您要购买的产品数量：')) 49 50 # 将所购买商品加入购物车 51 if product_id not in [item['id'] for item in products_cart]: 52 products_cart.append({'id':product_id,'count':count}) 53 54 else: 55 for i in range(len(products_cart)): 56 if products_cart[i].get('id') == product_id: 57 products_cart[i]['count'] += count 58 59 # 更新商品列表 60 for i in range(len(products)): 61 if products[i]['id'] == product_id: 62 products[i]['count'] -= count 63 64 else: 65 print('购物车信息如下：') 66 print('*'*30) 67 print('{:<10s}'.format('编号'),'{:<10s}'.format('购买数量')) 68 print('-'*30) 69 for i in range(len(products_cart)): 70 print('{:<10s}'.format(products_cart[i]['id']),'{:6d}'.format(products_cart[i]['count'])) 71 print('-'*30) 72 option = input('操作成功！请选择您的操作：1-查看商品；2-购物；3-查看购物车；其他-结账') 73 74 # 计算金额 75 if len(products_cart) > 0: 76 amount = 0 77 for i in range(len(products_cart)): 78 product_index = 0 79 for j in range(len(products)): 80 if products[j]['id'] == products_cart[i]['id']: 81 product_index = j 82 break 83 price = products[product_index]['price'] 84 count = products_cart[i]['count'] 85 amount += price*count 86 87 if 5000<amount <= 10000: 88 amount = amount*0.95 89 elif 10000<amount <= 20000: 90 amount = amount*0.9 91 elif amount>20000: 92 amount = amount*0.85 93 else: 94 amount = amount*1 95 96 print('购买成功，您需要支付{:<8.2f}元'.format(amount)) 97 98 # 退出系统 99 print('谢谢您的光临，下次再见！')
运行结果：
task8-3:
f-string：
源代码：
1 """ 2 家用电器销售系统 3 v1.4 4 """ 5 6 # 欢迎信息 7 print('欢迎使用家用电器销售系统！') 8 9 # 商品数据初始化 10 products = [ 11 {'id':'0001', 'name':'电视机', 'brand':'海尔', 'price':5999.00, 'count':20}, 12 {'id':'0002', 'name':'冰箱', 'brand':'西门子', 'price':6998.00, 'count':15}, 13 {'id':'0003', 'name':'洗衣机', 'brand':'小天鹅', 'price':1999.00, 'count':10}, 14 {'id':'0004', 'name':'空调', 'brand':'格力', 'price':3900.00, 'count':0}, 15 {'id':'0005', 'name':'热水器', 'brand':'美的', 'price':688.00, 'count':30}, 16 {'id':'0006', 'name':'笔记本', 'brand':'联想', 'price':5699.00, 'count':10}, 17 {'id':'0007', 'name':'微波炉', 'brand':'苏泊尔', 'price':480.50, 'count':33}, 18 {'id':'0008', 'name':'投影仪', 'brand':'松下', 'price':1250.00, 'count':12}, 19 {'id':'0009', 'name':'吸尘器', 'brand':'飞利浦', 'price':999.00, 'count':9}, 20 ] 21 22 # 初始化用户购物车 23 products_cart = [] 24 25 option = input('请选择您的操作: 1-查看商品；2-购物；3-查看购物车；其他-结账') 26 while option in ['1','2','3']: 27 if option == '1': 28 # 产品信息列表 29 print('产品和价格信息如下：') 30 print('*'*60) 31 a = ['编号','名称','品牌','价格','库存数量','购买数量'] 32 print(f'{a[0]:10s}{a[1]:10s}{a[2]:10s}{a[3]:10s}{a[4]:10s}') 33 print('-'*60) 34 for i in range(len(products)): 35 print(f'{products[i]["id"]:10s}{products[i]["name"]:10s}{products[i]["brand"]:10s}{products[i]["price"]:10.2f}{products[i]["count"]:10d}') 36 print('-'*60) 37 elif option == '2': 38 product_id = input('请输入您要购买的产品编号：') 39 while product_id not in [item['id'] for item in products]: 40 product_id = input('编号不存在，请重新输入您要购买的产品编号：') 41 42 count = int(input('请输入您要购买的产品数量：')) 43 while count >products[int(product_id)-1]['count']: 44 count = int(input('数量超出库存数量，请重新输入您要购买的产品数量：')) 45 46 # 将所购买商品加入购物车 47 if product_id not in [item['id'] for item in products_cart]: 48 products_cart.append({'id':product_id,'count':count}) 49 50 else: 51 for i in range(len(products_cart)): 52 if products_cart[i].get('id') == product_id: 53 products_cart[i]['count'] += count 54 55 # 更新商品列表 56 for i in range(len(products)): 57 if products[i]['id'] == product_id: 58 products[i]['count'] -= count 59 60 else: 61 print('购物车信息如下：') 62 print('*'*30) 63 print(f'{a[0]:10s}{a[5]:10s}') 64 print('-'*30) 65 for i in range(len(products_cart)): 66 print(f'{products_cart[i]["id"]:10s}{products_cart[i]["count"]:6d}') 67 print('-'*30) 68 option = input('操作成功！请选择您的操作：1-查看商品；2-购物；3-查看购物车；其他-结账') 69 70 # 计算金额 71 if len(products_cart) > 0: 72 amount = 0 73 for i in range(len(products_cart)): 74 product_index = 0 75 for j in range(len(products)): 76 if products[j]['id'] == products_cart[i]['id']: 77 product_index = j 78 break 79 price = products[product_index]['price'] 80 count = products_cart[i]['count'] 81 amount += price*count 82 83 if 5000<amount <= 10000: 84 amount = amount*0.95 85 elif 10000<amount <= 20000: 86 amount = amount*0.9 87 elif amount>20000: 88 amount = amount*0.85 89 else: 90 amount = amount*1 91 92 print(f'购买成功，您需要支付{amount:8.2f}元') 93 94 # 退出系统 95 print('谢谢您的光临，下次再见！')
运行结果：
实验总结：
通过本次实验你收获的具体知识点、思考等的归纳和梳理
回答：字典和集合的使用方法。
通过本次实验你的新发现、体会/感受；尚存的问题
体会：多样的表示方法使得代码更加易懂和简洁。
问题：内置函数的使用还不够灵活，应该多加练习。
其它你愿意反馈、分享的内容
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