python中字符串类型json操作的注意事项

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我是靠谱客的博主辛勤铃铛，最近开发中收集的这篇文章主要介绍python中字符串类型json操作的注意事项，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

python操作json的方法有

json.dumps——将json对象（字典）转换为字符串对象

json.loads——将字符串对象转换为json对象（字典）

如果定义json对象

jsonstring1={"results":[{"id":"1","name":"\u9ed8\u8ba4\u5206\u7ec4","policy":"4","timer_scan_setting":"{\"last\":\"10.29.13\",\"setting\":\"fulldisk\",\"type\":\"day\",\"hour\":\"13\"}"},
{"id":"2","name":"\u6d4b\u8bd5\u7684","policy":"1","timer_scan_setting":"{\"last\":\"10.29.15\",\"setting\":\"fulldisk\",\"type\":\"day\",\"hour\":\"15\"}"},{"id":"4","name":"\u4ea7\u54c1\u7ec4","policy":"3","timer_scan_setting":"{\"last\":\"10.8.15\",\"setting\":\"disable\"}"}]}

可以直接按json操作，比如

print jsonstring1.keys()
print jsonstring1['results'][0]['policy']

也可以转个360度再操作

jsonstring1=json.dumps(jsonstring1)
jsonstring1=json.loads(jsonstring1)
print jsonstring1.keys()
print jsonstring1['results'][0]['policy']

但是如果定义字符串对象就要小心了

jsonstring2='''{"results":[{"id":"1","name":"\u9ed8\u8ba4\u5206\u7ec4","policy":"4","timer_scan_setting":"{\"last\":\"10.29.13\",\"setting\":\"fulldisk\",\"type\":\"day\",\"hour\":\"13\"}"},
{"id":"2","name":"\u6d4b\u8bd5\u7684","policy":"1","timer_scan_setting":"{\"last\":\"10.29.15\",\"setting\":\"fulldisk\",\"type\":\"day\",\"hour\":\"15\"}"},{"id":"4","name":"\u4ea7\u54c1\u7ec4","policy":"3","timer_scan_setting":"{\"last\":\"10.8.15\",\"setting\":\"disable\"}"}]}'''

这个只是对上面的json对象加了三引号转为一个字符串，所以理论上可以直接loads之后就按json操作