python - 解析以引号开头的tsv文件

Question

我试图解析一个包含两列的 TSV 文件，有些行只包含引号。有没有一种方法可以使用 python 将它们解析为单独的行，而无需在引号前添加“\”？

presents    O
it    O
in    O
"   O
classical   O
"   O
principles  O
on  O
which   O
'   O
the O
operation   O
was O
'   O
conceived   O
.   O

我试过这样的代码

with open("sample.tsv") as tsvfile:
    tsvreader = csv.reader(tsvfile, delimiter="\t")
    for line in tsvreader:
        print (line)

三行结果不正确

"   O
classical   O
"   O

当前结果是

['\tO\nclassical\tO\n', 'O']

我想要的结果是

['"', 'O']
['classical', 'O']
['"', 'O']

Answer 1

您可以在创建实例时通过添加 quoting = csv.QUOTE_NONE 告诉 csv.reader 忽略引号字符:

import csv
with open("sample.tsv") as tsvfile:
    tsvreader = csv.reader(tsvfile, delimiter="\t", quoting=csv.QUOTE_NONE)
    for line in tsvreader:
        print (line)

输出(带引号的行):

['"', 'O']
['classical', 'O']
['"', 'O']

csv module 的文档解释说 csv.QUOTE_NONE “指示 reader 不对引号字符执行特殊处理。”