CS50-Python实验3,4
Week3 ExceptionsFuel Gauge
题目描述:
输入分数字符串,判断并输出相应的百分数;特例不足1%输出E,超出99%输出F
思路:
1,从字符串中取出x,y;
2,按题中要求计算输出;
题解:
while True:
try:
## 取出x,y
x, z, y= input("Fraction: ")
x, y = int(x), int (y)
##防止出错
if y == 0:
raise ZeroDivisionError
if x > y:
raise ValueError
break
except(ValueError, ZeroDivisionError):
pass
## 模拟题
if 0 < x/y < 0.99:
print(f"{round(x/y*100)}%")
elif x/y >= 0.99:
print("F")
else:
print("E")Felipe’s Taqueria
题目描述:
根据用户输入的信息,匹配菜单价格,最终算出最终价格。
题解:
## 菜单信息
menu = {
"Baja Taco": 4.00,
"Burrito": 7.50,
"Bowl": 8.50,
"Nachos": 11.00,
"Quesadilla": 8.50,
"Super Burrito": 8.50,
"Super Quesadilla": 9.50,
"Taco": 3.00,
"Tortilla Salad": 8.00,
}
##total:结果
total = 0
## 计算输出
while True:
try:
## title(): 首字母大写其余小写
item = input("Item: ").title()
if item in menu:
total += menu
print(f"Total: ${total:.2f}")
except EOFError:
print()
breakGrocery List
题目描述:
记录用户输入商品,最终输出已输入的商品以及商品数量;
题解:
## 存储商品信息
list = {}
while True:
## 输入处理
try:
## upper():字符串大写
item = input("").upper()
except EOFError:
print()
break
## 记录商品
if item in list:
list += 1
else:
list = 1
## 输出结果
for item, cnt in sorted(list.items()):
print(f"{cnt} {item}")Outdated
题目描述:
用户输入9/8/1636,September 8, 1636形式,系统转换输出1636-09-08;若用户输出其他形式抛异常。
题解:
## 月份记录months = [ "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]##思路:分情况讨论while True: date = input("Date: ") month,day,year = "", "", "" try: ## 9/8/1636 if len(date.split("/")) == 3: date = date.split("/") month, day, year = map(int, date) ## September 8, 1636 else: date = date.split(",") if len(date) == 2: month, day = date.split() month = months.index(month)+1 day, year = int(day), int(date) ##输出 if 1
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