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我只是在编写一个简单的货币转换器程序，我面临的一个问题是我想不出如何让用户更改变量的内容。下面是一个基本位：

def D2Y():
    def No():
        newconv=float(input("What is the rate that you want to use: "))
        amount=float(input("How much do you want to convert: $"))
        conversionn=round(amount*newconv,2)
        print("¥",conversionn)
        return (rerun())
    def Yes():
        conrate2=float(97.7677)
        amount=float(input("How much do you want to convert: $"))
        conversion=round(amount*conrate2,2)
        print("¥",conversion)
        return (rerun())
    def rerun():
        rerun=int(input("Do you want to go again?\n1 - Yes\n2 - No\nChoice: ")) 
        if rerun==1: 
            return (main()) 
        else: 
            print("Thank you for converting") 
    conrate1=int(input("The currency conversion rate for Yen to 1 US Dollar is ¥97.7677 to $1\n1 - Yes\n2 - No\nDo you want to use this rate?: "))
    if conrate1==1:
        return (Yes())
    else:
        return (No())

我不知道你是怎么做到的。我不介意您是否摆脱了 def 功能。

4

1 回答 1

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这是一种取消功能并允许您修改汇率的方法：

rate = CONVERSION_RATE = 97.7677
while True:
    print "The currency conversion rate for Yen to 1 US Dollar is ¥%.4f to $1" % rate
    print 'Select an option:\n1)Modify Conversion Rate\n2)Convert a value to dollars\n0)Exit\n'
    choice = int(raw_input('Choice: '))
    if choice == 0:
        print("Thank you for converting")
        break
    if choice == 1:
        try:
            rate = float(raw_input("What is the rate that you want to use: "))
        except ValueError:
            rate = CONVERSION_RATE

    amount = float(raw_input("How much do you want to convert: $"))
    print "¥", round(amount * rate,2)
    print '\n\n'

在使用中，它看起来像这样：

The currency conversion rate for Yen to 1 US Dollar is ¥97.7677 to $1
Select an option:
1)Modify Conversion Rate
2)Convert a value to dollars
0)Exit

Choice: 2
How much do you want to convert: $1.00
¥ 97.77

...

Choice: 1
What is the rate that you want to use: 96.9000
How much do you want to convert: $1.00
¥ 96.9
于 2013-04-30T17:55:35.617 回答