Question

我正在进行“保留更改任务”，在该操作中，我将购买金额四舍五入为整数，然后将更改添加到储蓄帐户中。但是，循环不会遍历我的外部文本文件中的所有值。它仅计算最后一个值。我尝试拆分文件，但它给了我一个错误。可能是什么问题？我的外部文本文件是这样的：

10.90 13.59 12.99 （每行不同）

def main（）：

account1 = BankAccount()                  
file1 = open("data.txt","r+")       # reading the file, + indicated read and write
s = 0       # to keep track of the new savings
for n in file1:
    n = float(n)    #lets python know that the values are floats and not a string
    z= math.ceil(n)      #rounds up to the whole digit
    amount = float(z-n)         # subtract the rounded sum with actaul total to get change
    print(" Saved $",round(amount,2), "on this purchase",file = file1)
    s = amount + s
    x = (account1.makeSavings(s))

Answer 1

我相当确定这是因为您要打印已保存到文件中的金额。通常，您不想更改要迭代的对象的长度，因为它会引起问题。

account1 = BankAccount()                  
file1 = open("data.txt","r+")       # reading the file, + indicated read and write
s = 0       # to keep track of the new savings
amount_saved = []
for n in file1:
    n = float(n)    #lets python know that the values are floats and not a string
    z= math.ceil(n)      #rounds up to the whole digit
    amount = float(z-n)         # subtract the rounded sum with actaul total to get change
    amount_saved.append(round(amount,2))
    s = amount + s
    x = (account1.makeSavings(s))
for n in amount_saved:
    print(" Saved $",round(amount,2), "on this purchase",file = file1)

这将在完成遍历之后在文件末尾打印您保存的金额。

如何确保在循环中计算出所有值？

1 个答案: