import sys
nargs = len(sys.argv)
outpath = ''
paramename = 'default'
print sys.argv
if nargs > 1:
    paramename = sys.argv[1]
print 'paramename = ', paramename

mainparams.py hello

output:

['D:\\projects\\python\\mainparams.py', 'hello']
paramename =  hello

import json
json_string = '{"first_name": "Guido", "last_name":"Rossum"}'
parsed_json = json.loads(json_string)
print parsed_json

output:return python object

{u'first_name': u'Guido', u'last_name': u'Rossum'}