Python - 向txt（tsv）文件添加注释和列

Question

有一个txt文件（点击分隔），注释如下：

[header]
This file is generated by Bingbong Kim
user name : user
user gender : male
user age : 45
[data]
user_item        color        price
item1            red          10
item2            black        20
item3            green        10
item4            blue         15

我想再添加一条评论（#user country）并插入一个所有值相同的新列：

[header]
This file is generated by Bingbong Kim
user name : user
user gender : male
user age : 45
user country : US
[data]
user_item        color        price        check
item1            red          10           true
item2            black        20           true
item3            green        10           true
item4            blue         15           true

现在我做了：

import pandas as pd

# save the comments in a list
header_list = []
temp_report = open('report.txt')
for i, line in enumerate(temp_report):
    header_list.append(line)
    if i == 7:
        temp_report.close()
        break

# create a dataframe without the comments
report = pd.read_csv('report.txt', skiprows=6, sep='\t')

# insert a column to the dataframe
report['check'] = "true"    #all values are same

# write the comment first and then write the changed dataframe
f = open('new_report.txt', 'a')
for comment in header_list:
    f.write(comment)
report.to_csv(f, sep='\t', index=False)
f.close()

我认为似乎有另一种好方法。每个txt文件大约需要50秒，因为txt文件太大了。我该如何改进呢？