if "A" in columns and int(columns[5]) < int(columns[3]):

print(columns)

print (columns[3]) - (columns[5])

我在这做错了什么？不记得我最近开始编码 .

这是完整的代码：

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])`

这是我得到的错误：

line 72, in Option_B

print (columns[3]) - (columns[5])

TypeError：不支持的操作数类型 - ：'NoneType'和'str'