[Bugs] #3142 UNSP: Use JSON implementations in Python's standard library instead of cjson

[Sugar Labs Bugs]

#3142: Use JSON implementations in Python's standard library instead of cjson
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    Reporter:  erikos                     |          Owner:  erikos                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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Comment(by manuq):

 Seems like simplejson replaced the stdlib json in Python 2.6.  If we want
 to be compatible with Python 2.4, we should perform a check and import
 simplejson instead.  They are interchangeable, share the same API.

 In Python 2.7, json seems faster for this simple test case:

 {{{
 [manuq at manuq-laptop olpc]$ python /usr/lib/python2.7/timeit.py -s "import
 json; d=dict(a=3, b=4)" "json.dumps(d)"
 10000 loops, best of 3: 49.7 usec per loop

 [manuq at manuq-laptop olpc]$ python /usr/lib/python2.7/timeit.py -s "import
 simplejson as json; d=dict(a=3, b=4)" "json.dumps(d)"
 10000 loops, best of 3: 51.5 usec per loop
 [manuq at manuq-laptop olpc]$
 }}}

 In Python 2.6, simplejson is a bit faster:

 {{{
 facundo at phenomenux:~$ timeit.py -s "import json; d=dict(a=3, b=4)"
 "json.dumps(d)"
 10000 loops, best of 3: 21.4 usec per loop
 facundo at phenomenux:~$ timeit.py -s "import simplejson as json; d=dict(a=3,
 b=4)" "json.dumps(d)"
 100000 loops, best of 3: 9.5 usec per loop

 facundo at phenomenux:~$ timeit.py -s "import json; s=json.dumps(dict(a=3,
 b=4))" "json.loads(s)"
 10000 loops, best of 3: 52.9 usec per loop
 facundo at phenomenux:~$ timeit.py -s "import simplejson as json;
 s=json.dumps(dict(a=3, b=4))" "json.loads(s)"
 100000 loops, best of 3: 5.71 usec per loop
 }}}

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3142#comment:4>
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