如何确保我的所有值都在我的循环中计算？答案

【问题标题】：How do I make sure all of my values are computed in my loop?如何确保我的所有值都在我的循环中计算？
【发布时间】：2019-09-18 14:17:05
【问题描述】：

我正在执行“保留零钱任务”，我将购买的金额四舍五入，然后将零钱添加到储蓄账户中。但是，循环不会遍历我的外部文本文件中的所有值。它只计算最后一个值。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 （每个在不同的行）

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))

【问题讨论】：

标签： python loops class object

【解决方案1】：

我很确定这是因为您正在打印已保存到文件中的金额。通常，您不希望更改正在迭代的对象的长度，因为这可能会导致问题。

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)

这将在您完成迭代后在文件末尾打印您保存的金额。

【讨论】：