【python】用python读取txt并按规则写入excle

对于这个问题，我写的代码是这样的

# coding: utf-8
import csv

TITLE = "【来源篇名】"
AUTHOR = "【来源作者】"
ORG = "【第一机构】"
KEYWORD = "【关 键 词】"
REFER = "【参考文献】"
# By WilliamsCarl。2019/3/24 2:21。
# 作者：王木槿天下第一。Copyright.
item_start = True
refer_start = False

headers = [TITLE, AUTHOR, ORG, KEYWORD, REFER]

items = []
with open('E:\\textOut.txt', encoding='gbk') as f:
    row = {
        'refer': []
    }

    for line in f.readlines():
        line = line.strip()
        # if not line:
        #     continue

        if TITLE in line:
            column = 0
            tl = line.split(TITLE)[1]
            refer_start = False
            row['tl'] = tl

        if AUTHOR in line:
            column = 1
            au = line.split(AUTHOR)[1]
            row['au'] = au

        if ORG in line:
            column = 2
            og = line.split(ORG)[1]
            row['og'] = og

        if KEYWORD in line:
            column = 3
            kw = line.split(KEYWORD)[1]
            row['kw'] = kw

        if REFER in line:
            refer_start = True
            continue

        if refer_start:
            row['refer'].append(line)

        if refer_start and (not line):
            refer_start = False

            item = [row['tl'], row['au'], row['og'], row['kw']]
            for r in row['refer']:
                item.append(r)

            items.append(item)
            row = {
                'refer': []
            }



with open('E:\\result.csv','w') as c:
    f_csv = csv.writer(c)
    f_csv.writerow(headers)
    f_csv.writerows(items)

目前的问题是，
比如【来源篇名】某一组不存在，他就会说keyerror，

当我将 i= [row['tl'], row['au'], row['og'], row['kw']] 变成row.setdefult,他的过滤又将一些存在的东西过滤掉了，如下图，

你把你的文本文件放上来，晚上我到家看下。