python 版本 3：如何要求用户将项目添加到字典并打印一条随其输入更新的消息？

Question

I'm a beginner learning Python and I'm stuck on this problem:

Ask the user to add one topping to the pizza. Modify the dictionary to have that item. Print out every topping the pizza contains, such as: This pizza contains Topping 1,Topping 2... and include the topping that the user added.

Given example of dictionary:

toppings = {‘pepperoni’:True,’olives':False,'pineapple':True,
‘sausage’:False,’jalapenos’:False}

This is what I have so far for the solution:

toppings= {'pepperoni':True, 'olives':False,'pineapple':True,
'sausage':False, 'jalapenos': False}

while True:
    pizza = input("Add one topping to the pizza:" )
    toppings[pizza] = input
    break

    print ("You ordered a pizza with the following toppings: " +  [toppings])

for toppings in pizza ['toppings']:
    print("\t" + topping)

Answer 1

First, I dont understanding why are you using a while loop. Since the program will exit the while loop as long as the user Enter something.

This is a way doing it

toppings= {'pepperoni':True, 'olives':False,'pineapple':True,
'sausage':False, 'jalapenos': False}

pizza = input("Add one topping to the pizza:" )
toppings[pizza] = True

print("This pizza contains ",end="")
for topping, topping_status in toppings.items():
    if topping_status:
        print(topping,end=" ")