題目描述：編寫乙個迴圈，提示使用者輸入一系列的比薩配料，並在使用者輸入'quit'時結束迴圈。每當
使用者輸入一種配料後，都列印一條訊息，說我們會在比薩中新增這種配料。
potato
tomato
fish
quit
output
please input an ingredient
we will put potato in pizza
please input an ingredient
we will put tomato in pizza
please input an ingredient
we will put fish in pizza
**展示：
while
message != "quit":
message = input("please input an ingredient\n")
ifmessage != 'quit':
print("we will put " + message + " in pizza")
題目描述：有家電影院根據觀眾的年齡收取不同的票價：不到三歲的觀眾免費；三到十二歲的觀眾為
10美元；超過12歲的觀眾為15美元。請編寫乙個迴圈，在其中詢問使用者的年齡，並指出其票價。
2 5
15output
how old are you?
2 you don』t need to pay
how old are you?
5 you need to pay 10 dollars
how old are you?
15 you need to pay 15 dollars
**展示：
age = ''
while
1 : age = input("how old are you?\n")
if age == 'quit':
break
num = int(age)
if num < 3
and num > 0:
print("you don't need to pay")
elif num >=3
and num <= 12:
print("you need to pay 10 dollars")
elif num > 12:
print("you need to pay 15 dollars")
題目描述：以另一種方式完成練習7-4或7-5，在程式中愛去如下所有做法。
·在while迴圈中使用條件測試來結束迴圈。
·使用變數active來控制迴圈結束的時機。
·使用break語句在使用者輸入『quit』時退出迴圈。
2 5
15output
how old are you?
2 you don』t need to pay
how old are you?
5 you need to pay 10 dollars
how old are you?
15 you need to pay 15 dollars
**展示：
#ver1
age = ''
while age != 'quit' :
age = input("how old are you?\n")
num = int(age)
ifnum< 3
andnum > 0:
print("you don't need to pay")
elif num >=3
andnum
<= 12:
print("you need to pay 10 dollars")
elif num > 12:
print("you need to pay 15 dollars")
#ver2
active = 0
while active != 1:
age = input("how old are you?\n")
if age == 'quit':
active = 1
else:
num = int(age)
ifnum< 3
andnum > 0:
print("you don't need to pay")
elif num >=3
andnum
<= 12:
print("you need to pay 10 dollars")
elif num > 12:
print("you need to pay 15 dollars")
#ver3
while
1 : age = input("how old are you?\n")
if age == 'quit':
break
num = int(age)
ifnum< 3
andnum > 0:
print("you don't need to pay")
elif num >=3
andnum
<= 12:
print("you need to pay 10 dollars")
elif num > 12:
print("you need to pay 15 dollars")
題目描述：建立乙個名為sandwich_orders的列表，在其中包含各種三明治的名字；再建立乙個名為
finished_sandwiches的空列表。遍歷列表sandwich_orders,對於其中的美中三明治，都列印一
條訊息，如i made your tuna sandwich，並將其移到列表finished_sandwiches。所有三明治
都製作好後，列印一條訊息，將這些三明治列出來。
output
**展示：
sandwich_orders = ['tuna sandwich', 'cheese sandwich', 'mayo sandwich']
finished_sandwiches =
while sandwich_orders:
sandwich = sandwich_orders.pop()
print('i made your ' + sandwich)
for sandwich in finished_sandwiches:
print(sandwich)
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