Python 2.6.6 (r266:84292, Jun 16 2011, 16:59:16)
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import json
>>> json.__version__
'1.9'
>>> json.loads('[["spam","eggs"]]')
[[u'spam', u'eggs']]

Python 2.7.1 (r271:86832, Dec 11 2010, 20:55:42)
[GCC 4.2.1 (Apple Inc. build 5664)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import json
>>> json.__version__
'2.0.9'
>>> json.loads('[["spam","eggs"]]')
[[u'spam', u'eggs']]
>>> import simplejson
>>> simplejson.__version__
'2.1.6'
>>> simplejson.loads('[["spam","eggs"]]')
[['spam', 'eggs']]