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169 lines
8.8 KiB
ReStructuredText
169 lines
8.8 KiB
ReStructuredText
UltraJSON
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=============
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UltraJSON is an ultra fast JSON encoder and decoder written in pure C with bindings for Python 2.5+ and 3.
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For a more painless day to day C/C++ JSON decoder experience please checkout ujson4c_, based on UltraJSON.
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.. _ujson4c: http://github.com/esnme/ujson4c/
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| Please checkout the rest of the projects in the Ultra series:
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| http://github.com/esnme/ultramemcache
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| http://github.com/esnme/ultramysql
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To install it just run Pip as usual::
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$ pip install ujson
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============
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Usage
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============
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May be used as a drop in replacement for most other JSON parsers for Python::
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>>> import ujson
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>>> ujson.dumps([{"key": "value"}, 81, True])
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'[{"key":"value"},81,true]'
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>>> ujson.loads("""[{"key": "value"}, 81, true]""")
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[{u'key': u'value'}, 81, True]
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~~~~~~~~~~~~~~~
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Encoder options
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~~~~~~~~~~~~~~~
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encode_html_chars
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-----------------
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Used to enable special encoding of "unsafe" HTML characters into safer Unicode sequences. Default is false::
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>>> ujson.dumps("<script>John&Doe", encode_html_chars=True)
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'"\\u003cscript\\u003eJohn\\u0026Doe"'
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ensure_ascii
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-------------
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Limits output to ASCII and escapes all extended characters above 127. Default is true. If your end format supports UTF-8 setting this option to false is highly recommended to save space::
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>>> ujson.dumps(u"\xe5\xe4\xf6")
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'"\\u00e5\\u00e4\\u00f6"'
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>>> ujson.dumps(u"\xe5\xe4\xf6", ensure_ascii=False)
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'"\xc3\xa5\xc3\xa4\xc3\xb6"'
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double_precision
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----------------
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Controls how many decimals to encode for double or decimal values. Default is 9::
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>>> ujson.dumps(math.pi)
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'3.1415926536'
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>>> ujson.dumps(math.pi, double_precision=1)
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'3.1'
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>>> ujson.dumps(math.pi, double_precision=0)
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'3'
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>>> ujson.dumps(math.pi, double_precision=4)
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'3.1416'
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~~~~~~~~~~~~~~~~
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Decoders options
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~~~~~~~~~~~~~~~~
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precise_float
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-------------
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Set to enable usage of higher precision (strtod) function when decoding string to double values. Default is to use fast but less precise builtin functionality::
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>>> ujson.loads("4.56")
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4.5600000000000005
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>>> ujson.loads("4.56", precise_float=True)
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4.5599999999999996
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============
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Benchmarks
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============
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*UltraJSON* calls/sec compared to three other popular JSON parsers with performance gain specified below each.
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~~~~~~~~~~~~~
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Test machine:
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~~~~~~~~~~~~~
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Linux version 2.6.32-131.0.15.el6.x86_64
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~~~~~~~~~
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Versions:
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~~~~~~~~~
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- ujson: 1.21
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- simplejson: 2.6.2
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- cjson: 1.05
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- yajl: 0.3.5
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- Python: Python 2.6.6 (r266:84292, Jul 20 2011, 10:22:43)
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+-----------------------------------------+--------+------------+--------+---------+
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| | ujson | simplejson | cjson | yajl |
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+=========================================+========+============+========+=========+
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| Array with 256 utf-8 strings | | | | |
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+-----------------------------------------+--------+------------+--------+---------+
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| Encode | 4090,74| 899,39 |83,86 | 3189,86 |
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+-----------------------------------------+--------+------------+--------+---------+
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| | | 4,55 |48,78 | 1,28 |
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+-----------------------------------------+--------+------------+--------+---------+
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| Decode | 863,29 | 586,15 |201,61 | 352,48 |
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+-----------------------------------------+--------+------------+--------+---------+
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| | | 1,47 | 4,28 | 2,45 |
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+-----------------------------------------+--------+------------+--------+---------+
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| Medium complex object | | | | |
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+-----------------------------------------+--------+------------+--------+---------+
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| Encode | 9750,37| 1377,15 |1512,06 | 3341,91 |
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+-----------------------------------------+--------+------------+--------+---------+
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| | | 7,08 | 6,45 | 2,92 |
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+-----------------------------------------+--------+------------+--------+---------+
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| Decode | 5576,75| 4247,16 | 3587,83| 2850,13 |
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+-----------------------------------------+--------+------------+--------+---------+
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| | | 1,31| 1,55 | 1,96 |
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+-----------------------------------------+--------+------------+--------+---------+
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| Array with 256 strings | | | | |
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+-----------------------------------------+--------+------------+--------+---------+
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| Encode |17998,01| 12954,46 |8715,02 | 15924,35|
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+-----------------------------------------+--------+------------+--------+---------+
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| | | 1,39| 2,07| 1,13 |
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+-----------------------------------------+--------+------------+--------+---------+
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| Decode |14540,71| 19696,13 |14908,46| 9547,14 |
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+-----------------------------------------+--------+------------+--------+---------+
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| | | 0,74 | 0,98 | 1,52 |
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+-----------------------------------------+--------+------------+--------+---------+
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| Array with 256 doubles | | | | |
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+-----------------------------------------+--------+------------+--------+---------+
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| Encode | 2185,20| 1466,87 | 1956,99| 3421,10 |
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+-----------------------------------------+--------+------------+--------+---------+
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| | | 1,49| 1,12 | 0,64 |
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+-----------------------------------------+--------+------------+--------+---------+
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| Decode |16062,01| 8990,50 | 9743,40|8331,74 |
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+-----------------------------------------+--------+------------+--------+---------+
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| | | 1,79| 1,65| 1,93 |
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+-----------------------------------------+--------+------------+--------+---------+
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| Array with 256 True values | | | | |
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+-----------------------------------------+--------+------------+--------+---------+
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| Encode |69767,60| 25202,56 |41145,99|64330,76 |
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+-----------------------------------------+--------+------------+--------+---------+
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| | | 2,77 | 1,70 | 1,08 |
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+-----------------------------------------+--------+------------+--------+---------+
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|Decode |91416,02| 56439,97 |54918,09| 42786,02|
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+-----------------------------------------+--------+------------+--------+---------+
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| | | 1,62| 1,66 | 2,14 |
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+-----------------------------------------+--------+------------+--------+---------+
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| Array with 256 dict{string, int} pairs | | | | |
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+-----------------------------------------+--------+------------+--------+---------+
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| | | | | |
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+-----------------------------------------+--------+------------+--------+---------+
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| Encode |11307,54| 1830,45 | 2720,90| 7725,56 |
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+-----------------------------------------+--------+------------+--------+---------+
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| | | 6,18| 4,16 | 1,46 |
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+-----------------------------------------+--------+------------+--------+---------+
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| Decode |8695,94 | 7572,89 | 6076,71|5231,32 |
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+-----------------------------------------+--------+------------+--------+---------+
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| | | 1,15| 1,43| 1,66 |
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+-----------------------------------------+--------+------------+--------+---------+
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| Dict with 256 arrays with 256 dict | | | | |
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+-----------------------------------------+--------+------------+--------+---------+
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| Encode | 37,76 | 4,88 | 10,49 | 27,62 |
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+-----------------------------------------+--------+------------+--------+---------+
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| | | 7,74| 3,60| 1,37 |
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+-----------------------------------------+--------+------------+--------+---------+
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|Decode | 17,70 | 15,56 | 11,25 | 12,00 |
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+-----------------------------------------+--------+------------+--------+---------+
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| | | 1,14| 1,57| 1,47 |
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+-----------------------------------------+--------+------------+--------+---------+
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