json.tool: use stdin and stdout in default cmdlne arguments (GH-11992)
Argparse can handle default value as stdin and stdout for parameters
as file type (infile, outfile).
diff --git a/Lib/json/tool.py b/Lib/json/tool.py
index 1d82bc8..b3ef992 100644
--- a/Lib/json/tool.py
+++ b/Lib/json/tool.py
@@ -21,17 +21,19 @@
'to validate and pretty-print JSON objects.')
parser = argparse.ArgumentParser(prog=prog, description=description)
parser.add_argument('infile', nargs='?', type=argparse.FileType(),
- help='a JSON file to be validated or pretty-printed')
+ help='a JSON file to be validated or pretty-printed',
+ default=sys.stdin)
parser.add_argument('outfile', nargs='?', type=argparse.FileType('w'),
- help='write the output of infile to outfile')
+ help='write the output of infile to outfile',
+ default=sys.stdout)
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
+ infile = options.infile
+ outfile = options.outfile
sort_keys = options.sort_keys
json_lines = options.json_lines
with infile, outfile: