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tool.py

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r"""Using simplejson from the shell to validate and

pretty-print::

$ echo '{"json":"obj"}' | python -msimplejson.tool

{

"json": "obj"

}

$ echo '{ 1.2:3.4}' | python -msimplejson.tool

Expecting property name: line 1 column 2 (char 2)

"""

import simplejson

def main():

import sys

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("%s [infile [outfile]]" % (sys.argv[0],))

try:

obj = simplejson.load(infile)

except ValueError, e:

raise SystemExit(e)

simplejson.dump(obj, outfile, sort_keys=True, indent=4)

outfile.write('\n')

if __name__ == '__main__':

main()