commit 15fb7fa88187f5841088721a43609bffe64a8dc7
author Daniel Himmelstein <daniel.himmelstein@gmail.com> Sat Dec 07 07:14:40 2019 -0700
committer Inada Naoki <songofacandy@gmail.com> Sat Dec 07 23:14:40 2019 +0900
tree df7fccd740a6002f7dcffdeed1ecff9c910c9582
parent 4443450fdaf248427cf4a00a6ee36229e6402ec6

bpo-29636: json.tool: Add document for indentation options. (GH-17482)

And updated test to use subprocess.run

Lib/json/tool.py

diff --git a/Lib/json/tool.py b/Lib/json/tool.py
index 5542ce4..6d7d9a0 100644
--- a/Lib/json/tool.py
+++ b/Lib/json/tool.py
@@ -33,7 +33,8 @@
     parser.add_argument('--no-ensure-ascii', dest='ensure_ascii', action='store_false',
                         help='disable escaping of non-ASCII characters')
     parser.add_argument('--json-lines', action='store_true', default=False,
-                        help='parse input using the jsonlines format')
+                        help='parse input using the JSON Lines format. '
+                        'Use with --no-indent or --compact to produce valid JSON Lines output.')
     group = parser.add_mutually_exclusive_group()
     group.add_argument('--indent', default=4, type=int,
                        help='separate items with newlines and use this number '