1、猜年龄 ， 可以让用户最多猜三次！
age = 55
i=0
while i<3:
user_guess = int (input ("input your guess:"))
if user_guess > age:
print ("try smaller ") elif user_guess < age:
print ("try bigger")
else :
print ("you got it")
break
i += 1
2、猜年龄 ，每隔3次，问他一下，还想不想继续玩，y,n
age = 55
i=0
while i<3:
user_guess = int (input ("input your guess:"))
if user_guess > age:
print ("try smaller ") elif user_guess < age:
print ("try bigger")
else :
print ("you got it")
break
i += 1
print(i)
if i % 3 == 0:
y_or_n= input("will continue? 'y' or 'n':")
if y_or_n == 'y':
i=0
elif y_or_n == 'n':
break
3、跳出多层循环，调用函数
方法一：
break_flag = False
for i in range(5):
print ("爷爷层",i)
for j in range(5):
print("爸爸层",j)
if i ==3:
break_flag = True
break
for k in range(5):
print ("孙子层",k)
if k ==2:
break_flag = True
break
if break_flag :
break
if break_flag :
print ("我出来了")
break
方法二：
break_flag = False
count = 0
while break_flag == False:
print("爷爷层")
while break_flag == False:
print("爸爸层")
while break_flag == False:
count +=1
if count >5:
print ("孙子层")
break_flag = True
print ("我出来了")
方法三：
跳出多层循环：（调用函数）
def work():
for i in range(5):
for j in range(5):
for k in range(5):
if i == j == k == 2:
return i,j,k
else:
print(i, '----', j, '----', k) print (work())
4、购物车程序：
功能要求：
要求用户输入总资产，例如：50
显示商品列表，让用户根据序号选择商品，加入购物车
购买，如果商品总额大于总资产，提示账户余额不足，否则，购买成功。
附加：可充值、某商品移除购物车
"""
"""
1.创建空的购物车列表
2.要求用户输入金额资产
3.输入后列出商品列表
4.用户选择商品，加入购物车
5.结算，如果商品价格大于用户总资产提示余额不足，询问是否删除商品
6.结算资金充裕，提示购买成功，显示余额并退出
展示一：
while True:
print("num\t\tgoods\t\tprices")
for i in range(len(goods)):
print(i + 1, ".\t\t", goods[i], "\t\t", prices[i])
print("q .\t\tquit")
num1 = input("请输入需要的物品编号：")
if num1 == 'q':
if len(goods_buy) != 0:
print("您购买的商品是:")
for j in range(len(goods)):
count1 = goods_buy.count(goods[j])
if count1 > 0:
print(goods[j], prices[j] * count1)
print("您还有 %d" % (salary))
print("bye bye")
break
else:
num=int(num1) if (num - 1) in range(len(goods)) and salary < prices[num - 1]:
print("买不起,还差 %d " % (prices[num - 1] - salary))
elif (num - 1) in range(len(goods)) and salary >= prices[num - 1]:
salary = salary - prices[num - 1]
goods_buy.append(goods[num - 1])
print("放入购物车,扣钱,余额为 %d" % (salary))
else:
print("请输入商品列表中的标号")
展示二：
product_list = [['Iphone7',5800],
['Coffee',30],
['疙瘩汤',10],
['Python Book',99],
['Bike',199],
['ViVo X9',2499],
] shopping_cart = []
salary = int(input("请输入你的工资:"))
while True:
num = 0
for product in product_list:
print(num,product)
num += 1
choice = input("请输入您所选的商品编号：").strip()
if choice.isdigit():
choice = int(choice)
if choice >= 0 and choice < len(product_list):
product = product_list[choice]
if product[1] <= salary:
shopping_cart.append(product)
salary = salary - product[1]
print ("物品"+product[0]+"已经加入购物车","您的金额还剩："+str(salary -product[1]) + ' 元')
else:
print("余额不足，"+"还差："+str(product[1]-salary)+"元")
else:
print ("商品不存在")
elif choice == "q":
print ("已经购买的商品有：")
for i in shopping_cart:
print (i) print ("您的余额为：",salary)
print("end")
break
else:
print ("无此选项！")