[英]Python: How do I remove text between two delimiters WITHOUT IMPORTING MODULE
[英]How to remove text between two delimiters in Python
我正在嘗試刪除短語“segmentation”之后 [] 括號之間的所有文本:“請參閱文件中的以下片段以了解上下文。
"annotations": [
{
"id": 1,
"image_id": 1,
"segmentation": [
[
621.63,
1085.67,
621.63,
1344.71,
841.66,
1344.71,
841.66,
1085.67
]
],
"iscrowd": 0,
"bbox": [
621.63,
1085.67,
220.02999999999997,
259.03999999999996
],
"area": 56996,
"category_id": 1124044
},
{
"id": 2,
"image_id": 1,
"segmentation": [
[
887.62,
1355.7,
887.62,
1615.54,
1114.64,
1615.54,
1114.64,
1355.7
]
],
"iscrowd": 0,
"bbox": [
887.62,
1355.7,
227.0200000000001,
259.8399999999999
],
"area": 58988,
"category_id": 1124044
},
{
"id": 3,
"image_id": 1,
"segmentation": [
[
1157.61,
1411.84,
1157.61,
1661.63,
1404.89,
1661.63,
1404.89,
1411.84
]
],
"iscrowd": 0,
"bbox": [
1157.61,
1411.84,
247.2800000000002,
249.7900000000002
],
"area": 61768,
"category_id": 1124044
},
........... and so on.....
我最終只想在出現分詞后刪除方括號之間的所有文本。 換句話說,output 看起來像(對於第一個實例):
"annotations": [
{
"id": 1,
"image_id": 1,
"segmentation": [],
"iscrowd": 0,
"bbox": [
621.63,
1085.67,
220.02999999999997,
259.03999999999996
],
"area": 56996,
"category_id": 1124044
},
我試過使用下面的代碼,但目前運氣不太好。 由於新線路,我有什么問題嗎?
import re
f = open('samplfile.json')
text = f.read()
f.close()
clean = re.sub('"segmentation":(.*)\]', '', text)
print(clean)
f = open('cleanedfile.json', 'w')
f.write(clean)
f.close()
我明白我對干凈行中 [s 的確切定位可能不太正確,但這段代碼目前沒有刪除任何內容。
Python 有一個內置的json
模塊,用於解析和修改 JSON。正則表達式可能很脆弱,而且比它的價值更讓人頭疼。
您可以執行以下操作:
import json
with open('samplfile.json') as input_file, open('output.json', 'w') as output_file:
data = json.load(input_file)
for i in range(len(data['annotations'])):
data['annotations'][i]['segmentation'] = []
json.dump(data, output_file, indent=4)
然后, output.json
包含:
{
"annotations": [
{
"id": 1,
"image_id": 1,
"segmentation": [],
"iscrowd": 0,
"bbox": [
621.63,
1085.67,
220.02999999999997,
259.03999999999996
],
"area": 56996,
"category_id": 1124044
},
{
"id": 2,
"image_id": 1,
"segmentation": [],
"iscrowd": 0,
"bbox": [
887.62,
1355.7,
227.0200000000001,
259.8399999999999
],
"area": 58988,
"category_id": 1124044
},
{
"id": 3,
"image_id": 1,
"segmentation": [],
"iscrowd": 0,
"bbox": [
1157.61,
1411.84,
247.2800000000002,
249.7900000000002
],
"area": 61768,
"category_id": 1124044
}
]
}
您的方法大部分是正確的,但 Python 正則表達式不接受\n
作為.
, 要修復它,請在 re.sub() 中添加flags=re.DOTALL
作為參數。
順便說一下,您可能需要在正則表達式中使用\"
而不是"
。
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