bpo-31553: add --json-lines option to json.tool (#10051)
* add jsonlines option to json.tool
* code review
* fix:avoid read infile after it close
* improve doc in whatsnew 3.8
diff --git a/Lib/json/tool.py b/Lib/json/tool.py
index 5932f4e..1d82bc8 100644
--- a/Lib/json/tool.py
+++ b/Lib/json/tool.py
@@ -26,19 +26,25 @@
help='write the output of infile to outfile')
parser.add_argument('--sort-keys', action='store_true', default=False,
help='sort the output of dictionaries alphabetically by key')
+ parser.add_argument('--json-lines', action='store_true', default=False,
+ help='parse input using the jsonlines format')
options = parser.parse_args()
infile = options.infile or sys.stdin
outfile = options.outfile or sys.stdout
sort_keys = options.sort_keys
- with infile:
+ json_lines = options.json_lines
+ with infile, outfile:
try:
- obj = json.load(infile)
+ if json_lines:
+ objs = (json.loads(line) for line in infile)
+ else:
+ objs = (json.load(infile), )
+ for obj in objs:
+ json.dump(obj, outfile, sort_keys=sort_keys, indent=4)
+ outfile.write('\n')
except ValueError as e:
raise SystemExit(e)
- with outfile:
- json.dump(obj, outfile, sort_keys=sort_keys, indent=4)
- outfile.write('\n')
if __name__ == '__main__':