(python2.6.8)
In [10]: import json In [11]: data = {"name": "ガッツ石松"} In [15]: print json.dumps(data) {"name": "\u30ac\u30c3\u30c4\u77f3\u677e"} In [16]: print json.dumps(data, ensure_ascii=False) {"name": "ガッツ石松"}
追記
encoding と indent のオプション
> print json.dumps(data, ensure_ascii=False, encoding='utf8', indent=2) { "name": "ガッツ石松" }