JezK
Edit File: tool.py
r"""Command-line tool to validate and pretty-print JSON Usage:: $ echo '{"json":"obj"}' | python -m json.tool { "json": "obj" } $ echo '{ 1.2:3.4}' | python -m json.tool Expecting property name enclosed in double quotes: line 1 column 3 (char 2) """ import argparse import json import sys from pathlib import Path def main(): prog = 'python -m json.tool' description = ('A simple command line interface for json module ' 'to validate and pretty-print JSON objects.') parser = argparse.ArgumentParser(prog=prog, description=description) parser.add_argument('infile', nargs='?', type=argparse.FileType(encoding="utf-8"), help='a JSON file to be validated or pretty-printed', default=sys.stdin) parser.add_argument('outfile', nargs='?', type=Path, help='write the output of infile to outfile', default=None) parser.add_argument('--sort-keys', action='store_true', default=False, help='sort the output of dictionaries alphabetically by key') 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 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 ' 'of spaces for indentation') group.add_argument('--tab', action='store_const', dest='indent', const='\t', help='separate items with newlines and use ' 'tabs for indentation') group.add_argument('--no-indent', action='store_const', dest='indent', const=None, help='separate items with spaces rather than newlines') group.add_argument('--compact', action='store_true', help='suppress all whitespace separation (most compact)') options = parser.parse_args() dump_args = { 'sort_keys': options.sort_keys, 'indent': options.indent, 'ensure_ascii': options.ensure_ascii, } if options.compact: dump_args['indent'] = None dump_args['separators'] = ',', ':' with options.infile as infile: try: if options.json_lines: objs = (json.loads(line) for line in infile) else: objs = (json.load(infile),) if options.outfile is None: out = sys.stdout else: out = options.outfile.open('w', encoding='utf-8') with out as outfile: for obj in objs: json.dump(obj, outfile, **dump_args) outfile.write('\n') except ValueError as e: raise SystemExit(e) if __name__ == '__main__': try: main() except BrokenPipeError as exc: sys.exit(exc.errno)