python的json操作

json和python的数据格式的对应关系

JSON	Python
object	dict
array	list
string	str
number (int)	int
number (real)	float
true	True
false	False
null	None

序列化json对象到文件 json.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) 个别参数说明：
     indent设置为'/t'，可以以缩进的形式写入文件。

序列化json对象到str json.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)
将文件内容转换为json对象 json.load(fp, cls=None, object_hook=None, parse_float=None, parse_int=None, parse_constant=None, object_pairs_hook=None, **kw)
将str内容转换为json对象
json.loads(s, encoding=None, cls=None, object_hook=None, parse_float=None, parse_int=None, parse_constant=None, object_pairs_hook=None, **kw)
代码示例

#!/usr/local/bin/python3
#coding=utf-8

import json

def encodeJson():
    test1_contents_dict = {"a": 1,"b": 2 ,"c": 3}
    test2_contents_list=[4,5,6]
    test_contents_dict={"test1":test1_contents_dict,"test2":test2_contents_list}
    test_dict={"test":test_contents_dict}

    
    test_json_data=json.dumps(test_dict,sort_keys=True)
    print(test_json_data)


    with open('E:\\test.json', 'w') as f:
        json.dump(test_dict,f,indent='\t',sort_keys=True)

def decodeJson():
    with open('E:\\test.json','r') as f:
        test_dict=json.load(f)
    test_contents_dict=test_dict['test']
    print(test_contents_dict)
    test1_contents_dict = test_contents_dict['test1']
    print(test1_contents_dict)
    test2_contents_list=test_contents_dict['test2']
    print(test2_contents_list)

    #print(test_dict['test']['test1'])
    #print(test_dict['test']['test2'])
if __name__ == '__main__':
    encodeJson()
    decodeJson()

输出json文件的内容：
    

{
    "test": {
        "test1": {
            "a": 1,
            "b": 2,
            "c": 3
         },
        "test2": [
            4,
            5,
            6
        ]
    }
}

附：   
一开始我把源文件的名字命名json.py，结果编译的时候报错：“AttributeError: 'module' object has no attribute 'dumps”,原来文件命名与python的json模块命名冲突