Question

我写了一个多项选择程序，它的表现不符合我的预期。

我希望它以这种方式行事 -

当您键入1时，转到#USD和
当您输入2时，它应该转到#Euro

以下是我的代码：

print "Welcome to Currency Converter By Fend Artz"
print "your options are:"
print " "
print "1) GDP -> USD"
print "2) GDP -> Euro"
USD = int(raw_input(''))
if USD == 1:
    choice = USDchoice    
elif USD == 2:
    choice = EUROchoice
else:
    print ("You have to put a number 1 or 2")
    int(raw_input(''))
#USD
def USDchoice():
    userUSD = float(input('How many pounds do you want to convert?(e.g. 5)\n'))
    USD = userUSD * 0.65
    print userUSD, "Pounds =",USD,"USDs"

#Euro
def EUROchoice():
    userEURO = float(input('How many pounds do you want to convert?(e.g. 5)\n'))
    Euro = userEURO * 1.37 
    print userEURO, "Pounds =",Euro,"Euros"

#Thing so the script doesn't instantly close
Enter = raw_input('press ENTER to close\n')

Answer 1

代码有两个问题。

您可以将变量choice设置为对您的某个功能的引用：USDChoice或EUROChoice。您需要调用这些函数，使用括号将变量设置为等于它们返回的值。正如一些评论指出的那样，您可以执行此操作，例如USDChoice()和EUROChoice()。
您尝试在功能创建之前调用它们。它们需要移到上面，因为一切都在全局范围内（模块级）。

固定代码：

#USD
def USDchoice():
    userUSD = float(input('How many pounds do you want to convert?(e.g. 5)\n'))
    USD = userUSD * 0.65
    print userUSD, "Pounds =",USD,"USDs"


#Euro
def EUROchoice():
    userEURO = float(input('How many pounds do you want to convert?(e.g. 5)\n'))
    Euro = userEURO * 1.37 
    print userEURO, "Pounds =",Euro,"Euros"


print "Welcome to Currency Converter By Fend Artz"
print "your options are:"
print " "
print "1) GDP -> USD"
print "2) GDP -> Euro"
USD = int(raw_input(''))

if USD == 1:
    choice = USDchoice()
elif USD == 2:
    choice = EUROchoice()
else:
    print ("You have to put a number 1 or 2")
    int(raw_input(''))

#Thing so the script doesn't instantly close
Enter = raw_input('press ENTER to close\n')

Python - if else - 程序流程

1 个答案: