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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 sys import json def main(): if len(sys.argv) == 1: infile = sys.stdin outfile = sys.stdout elif len(sys.argv) == 2: infile = open(sys.argv[1], 'rb') outfile = sys.stdout elif len(sys.argv) == 3: infile = open(sys.argv[1], 'rb') outfile = open(sys.argv[2], 'wb') else: raise SystemExit(sys.argv[0] + " [infile [outfile]]") with infile: try: obj = json.load(infile) except ValueError, e: raise SystemExit(e) with outfile: json.dump(obj, outfile, sort_keys=True, indent=4, separators=(',', ': ')) outfile.write('\n') if __name__ == '__main__': main()