跳出 while 循环

Question

shoppingList = [('Carrot',2), ('Onion',1), ('Tomato',3)]
amountGiven = 12
for item, price in shoppingList:

    openMenu = True
    while openMenu:
        costumerPick = input('Please choose item from the shoppingList\n')

        if costumerPick == 'Carrot':
            print('That would be: ${}'.format(price))
            amountGiven = amountGiven - price

            
        elif costumerPick == 'Onion':
            print('That would be: ${}'.format(price))
            amountGiven = amountGiven -price
            
        elif costumerPick == 'Tomato':
            print('That would be: ${}'.format(price))
            amountGiven = amountGiven - price

I want to break out the loop after the customer chooses one of these options

Answer 1

It seems you have the boolean openMenu and the while loop is only entered if openMenu = True .

Therefore, one way to solve this is to set openMenu = False after each of the conditional statements.

You would have:

openMenu = True
    while openMenu:
        costumerPick = input('Please choose item from the shoppingList\n')

        if costumerPick == 'Carrot':
            print('That would be: ${}'.format(price))
            amountGiven = amountGiven - price
            openMenu = False

            
        elif costumerPick == 'Onion':
            print('That would be: ${}'.format(price))
            amountGiven = amountGiven -price
            openMenu = False
            
        elif costumerPick == 'Tomato':
            print('That would be: ${}'.format(price))
            amountGiven = amountGiven - price
            openMenu = False

However, it doesn't seem like you really need the while loop since your for loop iterates over all the elements in your shoppingList.

Answer 2

I really didn't understand your question. If you want to break from the while loop, when certain condition is met, use 'break' statement.

shoppingList = [('Carrot',2), ('Onion',1), ('Tomato',3)]
amountGiven = 12

for item, price in shoppingList:
    openMenu = True
    while openMenu:
        costumerPick = input('Please choose item from the shoppingList\n')

        if costumerPick == 'Carrot':
            print('That would be: ${}'.format(price))
            amountGiven = amountGiven - price
            break

        elif costumerPick == 'Onion':
            print('That would be: ${}'.format(price))
            amountGiven = amountGiven -price
            break
        
        elif costumerPick == 'Tomato':
            print('That would be: ${}'.format(price))
            amountGiven = amountGiven - price
            break