import json
json_string = '{"name":"Rupert", "age": 25, "desig":"developer"}'
print type (json_string)
def func(strng):
    a =json.loads(strng)
    print type(a)
    for k,v in a.iteritems():
           print k,v
    print dict(a)      
func(json_string)

<type 'str'>
<type 'dict'>
desig developer
age 25
name Rupert
{u'desig': u'developer', u'age': 25, u'name': u'Rupert'}