Question

我尝试运行脚本时遇到此错误：

Traceback (most recent call last):
  File "<pyshell#6>", line 1, in <module>
    converter()
  File "C:\Users\Joan\Documents\School\Computing\Coursework\A453 - Python\Currency Converter.py", line 19, in converter
    exchange(currencyList)
  File "C:\Users\Joan\Documents\School\Computing\Coursework\A453 - Python\Currency Converter.py", line 33, in exchange
    crntItem = currencyList.index[crntCurrency] =+ 1
TypeError: 'builtin_function_or_method' object does not support item assignment

这是我的代码，一个未完成的货币转换器：

# Global ist
currencyList = ["Pound Sterling", 1, "Euro", 1.22, "US Dollar", 1.67, "Japanese Yen", 169.9480]



#################################
# A program to convert currency #
# Main function                 #
#################################
def converter():
    currencyList = ["Pound Sterling", 1, "Euro", 1.22, "US Dollar", 1.67, "Japanese Yen", 169.9480]
    print("1) Enter an amount to be exchanged.")
    print("2) Change exchange rates.")
    choice=0
    while choice==0:
        selected=int(input("Please select an option: "))
        if selected == 1:
            choice = 1
            exchange(currencyList)




#################################
# Giving exchanged rate         #
#################################

def exchange(currencyList):
    crntAmnt = int(input("Please enter the amount of money to convert: "))
    crntCurrency = ("Please enter the current currency: ")
    newCurrency = ("Please enter the currency you would like to convert to: ")
    listLength = len(currencyList)
    crntItem = currencyList.index[crntCurrency] =+ 1
    print(crntItem)
    newItem = currencyList.index[newCurrency] =+ 1
    print(newItem)

我尝试将主要功能设置为菜单，然后调用其他子功能来完成相关选择。我想知道这是否是一个好的方法来编码，因为我看到我的老师做了类似的事情，我应该把它放入'if'语句等。

这是一种好的，正确的编码方式吗？

Answer 1

currencyList.index是方法参考;要索引列表，请删除.index部分：

crntItem = currencyList[crntCurrency]
print(crntItem)
newItem = currencyList[newCurrency]

我怀疑您正试图在列表中找到crntCurrency的索引，然后添加1以找到该值：

crntItem = currencyList[currencyList.index(crntCurrency) + 1]

和

newItem = currencyList[currencyList.index(newCurrency) + 1]

但也许你应该在这里使用字典：

currencies = {"Pound Sterling": 1, "Euro": 1.22, "US Dollar": 1.67, "Japanese Yen": 169.9480}

这会将货币名称映射到一个数字，所以现在您只需查找货币而无需弄乱索引：

crntItem = currencies[crntCurrency]

哦，你忘记了实际的用户输入;在要求转换货币时添加input()来电：

crntCurrency = input("Please enter the current currency: ")
newCurrency = input("Please enter the currency you would like to convert to: ")

TypeError：'builtin_function_or_method'对象不支持项目分配

1 个答案: