python进行json操作

 

介绍

python有json模块，直接import json即可使用。主要有四个方法:

dumps将python类型转换为json字符串
loads将json字符串转换成python类型

dump将存有python类型的文件直接转为json字符串
load将存有json格式的文件转为python类型

-s方法是直接进行数据类型转换，而-方法则是包含了文件操作，可以通过import json;help(json.XXX)获得相关帮助，部分帮助内容如下：

帮助文档

1. dump(obj, fp, *, skipkeys=False, ensure_ascii=True, check_circular=True, allow_nan=True, cls=None, indent=None, separators=None, default=None, sort_keys=False, **kw)
   Serialize “obj“ as a JSON formatted stream to “fp“ (a
   “.write()“-supporting file-like object).
2. dumps(obj, *, skipkeys=False, ensure_ascii=True, check_circular=True, allow_nan=True, cls=None, indent=None, separators=None, default=None, sort_keys=False, **kw)
   Serialize “obj“ to a JSON formatted “str“.
3. load(fp, *, cls=None, object_hook=None, parse_float=None, parse_int=None, parse_constant=None, object_pairs_hook=None, **kw)
   Deserialize “fp“ (a “.read()“-supporting file-like object containing
   a JSON document) to a Python object.
4. loads(s, *, encoding=None, cls=None, object_hook=None, parse_float=None, parse_int=None, parse_constant=None, object_pairs_hook=None, **kw)
   Deserialize “s“ (a “str“, “bytes“ or “bytearray“ instance
   containing a JSON document) to a Python object.

python-json类型对应关系

python类型→json类型

dict→object
list, tuple→array
str, unicode→string
int, long, float→number
True,False→true,false
None→null

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