python - 如何将此代码更改为不打印未使用的硬币=0？

Question

我正在尝试构建一个功能，在人们输入金额后，它将显示他们需要的最少硬币或纸币数量。但这有什么方法可以让我改变它，使它不会打印未使用硬币的名称和编号？（作为初学者）感谢您的帮助！（是否可以通过使用 for 循环来处理它？）

标签： python

Answer 1

不要为每个恶魔保留一个变量，而是保留一个 dict 并根据所使用的面额更新 key: val。查看代码

amount=int(input('Enter an amount: '))

denominations = dict()

print('Total number of notes/coins=')

if amount>=1000:
    denominations['1000'] = amount//1000
    amount%=1000    
if amount>=500:
    denominations['500'] = amount//500
    amount= amount%500
if amount>=100:
    denominations['100'] = amount//100
    amount= amount%100
if amount>=50:
    denominations['50'] = amount//50
    amount= amount%50    
if amount>=20:
    denominations['20'] = amount//20
    amount= amount%20    
if amount>=10:
    denominations['10'] = amount//10
    amount= amount%10
if amount>=5:
    denominations['5'] = amount//5
    amount= amount%5   
if amount>=2:
    denominations['2'] = amount//2
    amount= amount%2    
if amount>=1:
    denominations['1'] = amount//1

for key, val in denominations.items():
    print(f"{key}: {val}")


Enter an amount: 523
Total number of notes/coins=
500: 1
20: 1
2: 1
1: 1

如果您使用如下所示的简单逻辑，您可以减少代码行数，

def find_denominations():
    
    amount=int(input('Enter an amount: '))
    
    denominations = dict()
    
    DENOMINATIONS = [1000, 500, 100, 50, 20, 10, 5, 2, 1]
       
    print('Total number of notes/coins=')
    
    for d in DENOMINATIONS:
        if amount >= d:
            denominations[d] = amount // d
            amount %= d

    for key, val in denominations.items():
        print(f"{key}: {val}")