Python 试图以不同格式输出到另一个文件

尝试输入文本文件（文本#1）并以以下格式输出到另一个文本文件（文本#2）。遇到错误。我是Python新手，如果有任何帮助，我将不胜感激

正文#1

正文#2

到目前为止，我所拥有的：

inputfilename= input('Enter sales file name: ')
outputfilename=input('Enter name for total sales file: ')

with open(inputfilename, 'r') as i, open(outputfilename, 'w') as o:
    for line in i:
        fst_sale, lst_sale = line.split(' ')
        fst_sale = float(fst_sale[1:])
        lst_sale = float(lst_sale[1:])
        tot_sale = fst_sale + lst_sale
        new_line = ''.join(
            ['$' + str(x).rjust(10) 
            for x in [fst_sale, lst_sale, tot_sale]]
        )
        o.write(new_line + '\n')

当我点击run时出现以下错误：

 fst_sale, lst_sale = line.split(' ')
ValueError: not enough values to unpack (expected 2, got 1)

---

错误消息确切地告诉您出了什么问题：您尝试在“”处拆分一行并将其分解为两部分，但只得到了一部分。明智的做法是设置一个断点并检查行，或者取消对拆分的注释，而是打印它以检查它

如果您的行包含2个部分，您可以在实际将其分解为2个部分之前进行测试，以避免该错误：

with open(inputfilename, 'r') as i, open(outputfilename, 'w') as o:
    for line in i:
        if len(line.split(" ")) == 2: # only do it if you can split in 2 parts 
            fst_sale, lst_sale = line.split(' ')
            fst_sale = float(fst_sale[1:])
            lst_sale = float(lst_sale[1:])
            tot_sale = fst_sale + lst_sale
            new_line = ''.join(
                ['$' + str(x).rjust(10) 
                for x in [fst_sale, lst_sale, tot_sale]]
            )
            o.write(new_line + '\n')

---

阅读和跟随-这将使您能够解决自己的问题。

Read and follow-您的文件前面/结尾可能有一些空行，这些行是已阅读的，不能分解为两部分，因为它没有两部分。@jpp同一作者，同一代码，其他问题-无重复。只是缺少努力解决自己的问题。

 fst_sale, lst_sale = line.split(' ')
ValueError: not enough values to unpack (expected 2, got 1)

with open(inputfilename, 'r') as i, open(outputfilename, 'w') as o:
    for line in i:
        if len(line.split(" ")) == 2: # only do it if you can split in 2 parts 
            fst_sale, lst_sale = line.split(' ')
            fst_sale = float(fst_sale[1:])
            lst_sale = float(lst_sale[1:])
            tot_sale = fst_sale + lst_sale
            new_line = ''.join(
                ['$' + str(x).rjust(10) 
                for x in [fst_sale, lst_sale, tot_sale]]
            )
            o.write(new_line + '\n')