python - 如何从具有变化元素的 JSONL 文件中提取元素？

Question

我想从 JSONL 文件中的标记中提取“文本”。如果存在标签，那么我也想提取它。如果它不存在，那么我想插入“O”作为标签的值

{"text":"This is the first sentence.","_input_hash":2083129218,"_task_hash":-536378640,"spans":[],"meta":{"score":0.5,"pattern":65},"answer":"accept","tokens":[
{"text":"This","id":0},
{"text":"is","id":1},
{"text":"the","id":2},
{"text":"first","id":3},
{"text":"sentence","id":4},
{"text":".","id":5}]}
{"text":"This is coded in python.","_input_hash":2083129218,"_task_hash":-536378640,"spans":[],"meta":{"score":0.5,"pattern":65},"answer":"accept","tokens":[
{"text":"This","id":0},
{"text":"is","id":1},
{"text":"coded","id":2},
{"text":"in","id":3},
{"text":"python","label":"Programming"},
{"text":".","id":5}]}

如果不存在标签，可用于从标记中提取文本和 id 的代码如下：（感谢@DeveshKumarSingh in my previous question）

import jsonlines

#Open the file, iterate over the tokens and make the tuples
result = [(idx+1, i['text'], i['id']+1) for idx, obj in enumerate(jsonlines.open('file.txt')) for i in obj['tokens']]

print(result)

预期输出：

Answer 1

您可以dict.get在标签存在时使用它来查找标签，否则将其替换为默认O值i.get('label','O')

import jsonlines

#Open the file, iterate over the tokens and make the tuples
result = [(idx+1, i['text'], i.get('label','O')) for idx, obj in enumerate(jsonlines.open('file.txt')) for i in obj['tokens']]

print(result)

输出将是

[(1, 'This', 'O'),
 (1, 'is', 'O'), 
(1, 'the', 'O'), 
(1, 'first', 'O'), 
(1, 'sentence', 'O'), 
(1, '.', 'O'), 
(2, 'This', 'O'), 
(2, 'is', 'O'), 
(2, 'coded', 'O'), 
(2, 'in', 'O'), 
(2, 'python', 'Programming'), 
(2, '.', 'O')]