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json.tool: use stdin and stdout in default cmdlne arguments (GH-11992)

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Argparse can handle default value as stdin and stdout for parameters
as file type (infile, outfile).
This commit is contained in:
Hervé Beraud 2019-05-14 18:52:42 +02:00 • committed by Victor Stinner
parent f12ba7cd0a
commit 4d45a3b110
1 changed files with 6 additions and 4 deletions
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10
Lib/json/tool.py
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@ -21,17 +21,19 @@ def main():
'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: