python数据类型
自己做的：
# # name = 'albert' # # for i in name : # # print(i) # #一个列表name通过for 临时变量j in name来循环 # name = ['albert','boy','23',1995,6,1] # for j in name: # # print(name.index(j),j) # if name.index(j)%2 == 0: # name[name.index(j)] = '-1' # print(name.index(j)) # 1. names = ['old_driver','rain','jack','shanshan','peiqi','black_girl'] # 2. names.insert(names.index('black_girl'),'alex') #3. names[names.index('shanshan')]='姗姗' # 4. names.insert(names.index('rain')+1,['oldboy','oldgirl']) # 5. n = names.index('peiqi') # 6. names2 = [1,2,3,4,2,5,6,2] names = names + names2 # 7. n2=names[4:8] # 8. n3=names[2:11:2] # 9. n4 = names[-3:] # 10. # for i in names: # print('loop:',names.index(i),i) # 11. # for i in names: # print('loop:',names.index(i),i) # if names.index(i) %2 == 0: # names[names.index(i)] = '-1' # print(names) #12. names[names.index(2)] = '第一个2' print(names.index(2)) # 13. products = [['Iphone8',6888],['Mac Pro',14800],['小米6',2499],['Coffee',31],['Book',80],['Nike Shoes',799]] print('------------------商品列表------------------') for k in products: print((products.index(k)),'.',k) # 14.
products = [['Iphone8',6888],['Mac Pro',14800],['小米6',2499],['Coffee',31],['Book',80],['Nike Shoes',799]] shopping = [] # print('-------------商品列表-------------') # for index,p in enumerate(products): # print(''' %s %s %s ''' %(index,p[0],p[1])) while True: info = ''' %s %s %s ''' print('-------------商品列表-------------') for index,p in enumerate(products): print(info %(index,p[0],p[1])) choose = int(input("请选择要买的商品编号：")) print("您的商品如下：",'''%s %s ''' %((products[choose])[0],(products[choose])[1]) ) shopping.insert(choose,products[choose]) print(shopping)
第11题：
names = ['old_driver','rain','jack','shanshan','peiqi','black_girl'] count = 0 for i in names: count += 1 if count % 2== 0: i = '-1' print(count, i)
还可以用枚举：enumerate
for i in enumerate(names): print(i)
去括号：
for index,i in enumerate(names): print(index,i)
第12题：
names = ['old_driver','rain','jack','shanshan','peiqi','black_girl',1,2,3,4,2,5,6,2] count = 0 for i in names: if i == 2: print(count) count += 1
正确答案：
names = ['old_driver','rain','jack','shanshan','peiqi','black_girl',1,2,3,4,2,5,6,2] first_val = names.index(2) new_names=names[first_val+1:] second_val = new_names.index(2) print('second 2 is:',first_val+second_val+1)
第13题：
products = [['Iphone8',6888],['Mac Pro',14800],['小米6',2499],['Coffee',31],['Book',80],['Nike Shoes',799]] # print('-------------商品列表-------------') # for index,p in enumerate(products): # print(''' %s %s %s ''' %(index,p[0],p[1])) info = ''' %s %s %s ''' print('-------------商品列表-------------') for index,p in enumerate(products): print(info %(index,p[0],p[1]))
第14题：
1.
products = [['Iphone8',6888],['Mac Pro',14800],['小米6',2499],['Coffee',31],['Book',80],['Nike Shoes',799]] shopping_cart = [] # print('-------------商品列表-------------') # for index,p in enumerate(products): # print(''' %s %s %s ''' %(index,p[0],p[1])) while True: info = ''' %s %s %s ''' print('-------------商品列表-------------') for index,p in enumerate(products): print(info %(index,p[0],p[1])) choose = input("请选择要买的商品编号：") if choose.isdigit() : choose = int(choose) print("您的商品如下：",'''%s %s ''' %((products[choose])[0],(products[choose])[1]) ) shopping_cart.append(products[choose]) elif choose == 'q': print('----------已购买商品如下----------') for index,p in enumerate(shopping_cart): print(''' %s %s %s''' %(index,p[0],p[1])) break
2.
products = [['Iphone8',6888],['Mac Pro',14800],['小米6',2499],['Coffee',31],['Book',80],['Nike Shoes',799]] shopping_cart = [] 命名要规范 # print('-------------商品列表-------------') # for index,p in enumerate(products): # print(''' %s %s %s ''' %(index,p[0],p[1])) run_flag = True ######注意 while run_flag: info = ''' %s %s %s ''' print('-------------商品列表-------------') for index,p in enumerate(products): #枚举 print(info %(index,p[0],p[1])) choose = input("请选择要买的商品编号：") if choose.isdigit() : ##判断是否为数 choose = int(choose) if choose >= 0 and choose < len(products) : #len(products)表示products列表长度 ##判断商品是否存在 print("您的商品如下：",'''%s %s ''' %((products[choose])[0],(products[choose])[1]) ) shopping_cart.append(products[choose]) else: print("您的商品不存在") elif choose == 'q': if len(shopping_cart) > 0: print('----------已购买商品如下----------') for index,p in enumerate(shopping_cart): print(''' %s %s %s''' %(index,p[0],p[1])) # break run_flag = False
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