In http://docs.python.org/library/json.html:
simplejson.load(fp[, encoding[, cls[, object_hook[, parse_float[, parse_int[, parse_constant[, object_
simplejson has the calls loads and dumps that consumes and produce strings instead of file like objects.
This link has an example in the context of StringIO and simplejson for both file-like and string objects.
http://svn.red-bean.com/bob/simplejson/tags/simplejson-1.3/docs/index.html