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python json 读写操作1、dumps把字典类型转换成字符串

{% code %} import json

new_dict = {'s_uid': 1, 's_date': ['2017-05-01', '2017-05-15'], 's_T': 2, 's_time': ['12:00:00', '17:00:00'], 's_local': 2, 'percent': 0.53, 'loss': 0.3, 'a': 4}

print(new_dict) print(type(new_dict))

json_str = json.dumps(new_dict) print(json_str) print(type(json_str)) {% endcode %}

结果：

{% code %} {'a': 4, 'loss': 0.3, 's_date': ['2017-05-01', '2017-05-15'], 's_uid': 1, 's_time': ['12:00:00', '17:00:00'], 's_local': 2, 'percent': 0.53, 's_T': 2}

<type 'dict'> {"a": 4, "loss": 0.3, "s_date": ["2017-05-01", "2017-05-15"], "s_uid": 1, "s_time": ["12:00:00", "17:00:00"], "s_local": 2, "percent": 0.53, "s_T": 2}

<type 'str'> {% endcode %}

2、dump把字典保存到json格式文件

{% code %} with open("mode.json","w") as f: json.dump(dict,f) {% endcode %}

3、loads把字符串转换成字典

{% code %} new_dict = json.loads(json_str) print(new_dict) print(type(new_dict)) {% endcode %}

结果：

{% code %} {u'a': 4, u'loss': 0.3, u's_T': 2, u'percent': 0.53, u's_date': [u'2017-05-01', u'2017-05-15'], u's_uid': 1, u's_time': [u'12:00:00', u'17:00:00'], u's_local': 2}

<type 'dict'> {% endcode %}

4、load把json格式文件内容转为list

{% code %} with open("mode.json",'r') as load_f: load_dict = json.load(load_f) print(load_dict) {% endcode %}