如何在硬币找零计算器中仅显示数量大于零的硬币？

我正在开发一款硬币找零计算器，已经写完全部代码，但无法实现仅显示所需硬币（不显示数量为0的硬币）。当前程序运行时会输出所有硬币类型，包括数量为0的quarters（25美分）、dimes（10美分）、nickels（5美分），示例输出如下：

Enter change amount to convert: 3
0 quarter(s)
0 dime(s)
0 nickle(s)
3 penny(ies)
Want to calculate another amount? (y/n): 

我希望不显示quarters、dimes和nickels这类数量为0的硬币，现有Python代码如下：

while True:
    change = input("Enter change amount to convert: ")
    if str(change).isnumeric():
        change = int(change)
        if change < 100:
            quarters, dimes, nickels, pennies = coinCalc(change)
            print(quarters, "quarter(s)")
            print(dimes, "dime(s)")
            print(nickels, "nickle(s)")
            print(pennies, "penny(ies)")
            print("Want to calculate another amount? (y/n): ")
            answer = input()
            if answer == "n":
                print("Bye!")
                break
        else:
            print("Error! Invalid integer entered please try again.")
    else:
        print("Error! Invalid integer entered please try again.")

解决方案 #

你可以通过将硬币数量与名称配对，遍历后仅打印数量大于0的项来实现需求，修改后的代码如下：

while True:
    change = input("Enter change amount to convert: ")
    if str(change).isnumeric():
        change = int(change)
        if change < 100:
            quarters, dimes, nickels, pennies = coinCalc(change)
            # 组合硬币数量与对应名称
            coin_list = [
                (quarters, "quarter(s)"),
                (dimes, "dime(s)"),
                (nickels, "nickle(s)"),
                (pennies, "penny(ies)")
            ]
            # 仅输出数量大于0的硬币
            for count, label in coin_list:
                if count > 0:
                    print(count, label)
            print("Want to calculate another amount? (y/n): ")
            answer = input()
            if answer == "n":
                print("Bye!")
                break
        else:
            print("Error! Invalid integer entered please try again.")
    else:
        print("Error! Invalid integer entered please try again.")

说明

• 将每种硬币的数量和名称打包成元组存入列表，便于统一遍历处理
• 通过if count > 0的判断，过滤掉数量为0的硬币条目，只输出实际需要的找零硬币

内容的提问来源于stack exchange，提问作者Ty Kenyon