有没有办法解决这个 TypeError

Question

我无法弄清楚我的代码有什么问题。我需要帮助。

next(fhr) # skip header row
customer_list = [] # initialize empty customer list

for line in fhr:
    ls = line.split(',')
    customer_list.append([ls[0], ls[1], ls[2], ls[3], ls[4], ls[5], ls[6], int(ls[7]), ls[8], ls[9], ls[10].strip('\n')])

from operator import itemgetter
customer_list.sort(key=itemgetter(7), reverse=True)
print(customer_list)

writepath = './loan-data-output-v1.csv'
fwh = open(writepath, 'w', encoding='utf-8')
fwh.write('Name' +','+ 'State' +','+'Age' +','+'Annual Income'+','+ 'Loan Type' +','+' Loan Amount' +','+ 'Length of Loan in Years' +','+ 'Days Delinquent' +','+ 'Interest Rate' +','+ 'Number of Loans Prior' +','+'Years as Customer' + '\n')

for i in customer_list:
    if customer_list[i][7] >= 90:
        fwh.write(customer_list[i][0] + ',' + customer_list[i][1] + ',' + customer_list[i][2] + ',' + customer_list[i][3] + ',' + customer_list[i][4] + ',' + customer_list[i][5] + ',' + customer_list[i][6] + ',' + customer_list[i][7] + ',' + customer_list[i][8] + ',' + customer_list[i][9] + ','+ customer_list[i][10] + '\n')
fhr.close()
fwh.close()

我在最后一个 for 循环中收到此错误，我不知道该怎么办。有人可以帮忙吗。 TypeError: 列表索引必须是整数或切片，而不是列表

Answer 1

您正在使用列表列表，因此当您使用for i in list_of_list 时，i 本身就变成了一个列表..

for i in customer_list:
    if i[7] >= '90':
        fwh.write(i[0] + ',' + i[1] + ',' + i[2] + ',' + i[3] + ',' + i[4] + ',' + i[5] + ',' + i[6] + ',' + str(i[7]) + ',' + i[8] + ',' + i[9] + ','+ i[10] + '\n')
fhr.close()
fwh.close()

您也可以使用，

for i in range(0,len(customer_list)):
    if customer_list[i][7] >= '90':
        fwh.write(customer_list[i][0] + ',' + customer_list[i][1] + ',' + customer_list[i][2] + ',' + customer_list[i][3] + ',' + customer_list[i][4] + ',' + customer_list[i][5] + ',' + customer_list[i][6] + ',' + str(customer_list[i][7]) + ',' + customer_list[i][8] + ',' + customer_list[i][9] + ','+ customer_list[i][10] + '\n')
fhr.close()
fwh.close()

编辑：第二种方法假定customer_list 的长度是恒定的，或者换句话说，您在循环期间没有向customer_list 添加任何内容。感谢DanielRoseman 指出第二个代码中的潜在错误..

编辑 2： 感谢quamrana 提出这样的建议，

for i in customer_list:
    if i[7] >= '90':
        i[7] = str(i[7])
        fwh.write(','.join(i[0:11]) + '\n')
fhr.close()
fwh.close()