Python 如何从.txt文件中删除2个值

TypeError:-：“NoneType”和“str”的操作数类型不受支持

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在打印之前，您可能需要转换数字：

line 72, in Option_B
print (columns[3]) - (columns[5])

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发布您的示例输入、输出、您尝试过的内容以及您期望的结果。您是否收到错误消息，如果是，是什么？你得到的结果不正确吗？什么是专栏？你期望得到什么结果？您正在使用Python 2吗？好的，我已经更新了postCan，您可以发布完整的错误消息吗？也就是说，错误发生在哪一行。错误消息清楚地表明，

columns[3]

是

None

，

columns[5]

是一个字符串。你试图从前者中减去后者。这毫无意义。纠正这个。

import csv

FILE_NAME = "paintingJobs.txt" #I use this so that the file can be used easier
COL_HEADERS = ['Number', 'Date', 'ID', 'Total', 'Status', 'Paid']
NUM_COLS = len(COL_HEADERS)#This will insure that the header of each column fits into the length of the data

# read file once to determine maximum width of data in columns
with open(FILE_NAME) as f:
    reader = csv.reader(f, delimiter=',')
    # determine the maximum width of the data in each column
    max_col_widths = [len(col_header) for col_header in COL_HEADERS]
    for columns in reader:
        for i, col in enumerate(columns):
            if "A" in columns and int(columns[5]) < int(columns[3]):
                max_col_widths[i] = max(max_col_widths[i], len(repr(col)))
    # add 1 to each for commas
    max_col_widths = [col_width+1 for col_width in max_col_widths]

# read file second time to display its contents with the headers
with open(FILE_NAME) as f:
    reader = csv.reader(f, delimiter=',')
    # display justified column headers
    print(' ' + ' '.join(col_header.ljust(max_col_widths[i])
                            for i, col_header in enumerate(COL_HEADERS)))
    # display justified column data
    for columns in reader:
        if "A" in columns and int(columns[5]) < int(columns[3]):
            print(columns)
            print (columns[3]) - (columns[5])`

line 72, in Option_B
print (columns[3]) - (columns[5])

print("The result: ")
print(int(column[3]) - int(column[5]))