Question

我是python的极端初学者，我想知道这个程序我设置计算提示有什么问题

total = input("What is the bill total? ")

tperc = input("Would you like to give a 15% or 20% tip? ")

tip15 = total * .15
tip20 = total * .20

if tperc == "15":
    print("\nThat would be a $" + tip15 + "tip.")

if tperc == "15%":
    print("\nThat would be a $" + tip15 + "tip.")

if tperc == "20":
    print("\nThat would be a $" + tip20 + "tip.")

if tperc == "20%":
    print("\nThat would be a $" + tip20 + "tip.")

input("\nPress enter to exit.")

感谢您的帮助

Answer 1

public IEnumerableSomeClassConverter : JsonConverter
{
    public override bool CanConvert(Type objectType) {}

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        // Handle the weirdness here and return my IEnumerable
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer) {}
}

在Python 3.X中，total = input("What is the bill total? ") #... tip15 = total * .15返回一个字符串。您不能将字符串乘以浮点数。

在进行任何算术之前将input转换为数字。

total

或者，理想情况下，使用Decimal类型进行货币计算，因为浮点运算往往是not perfectly accurate。

total = float(input("What is the bill total? "))

from decimal import Decimal
total = Decimal(input("What is the bill total? "))
#...
tip15 = total * Decimal("0.15")

这也是一个问题，因为你不能连接字符串和float / Decimal。转换为字符串或使用字符串格式。后者可能更好，因为你可以舍入到小数点后两位。

print("\nThat would be a $" + tip15 + "tip.")

我的程序计算提示有什么问题？

1 个答案: