python3：jsonpath-rw处理Json对象

前提：接口自动化测试中，存在依赖情况：test_02的某个请求参数的值，需要依赖test_01返回结果中某个字段的数据，所以就先需要拿到返回数据中特定字段的值。这里使用到python中jsonpath-rw库

1.下载安装

pip install jsonpath-rw

2.导入

from jsonpath_rw import jsonpath,parse

3.例子介绍

1.返回的match数据，但我们想要的是value数据

jsonpath_expr = parse('foo[*].baz')
data = {'foo': [{'baz': 'news'}, {'baz': 'music'}]}
print([match for match in jsonpath_expr.find(data)])

运行结果：
[DatumInContext(value='news', path=Fields('baz'), context=DatumInContext(value={'baz': 'news'}, path=<jsonpath_rw.jsonpath.Index object at 0x025CA850>, context=DatumInContext(value=[{'baz': 'news'}, {'baz': 'music'}], path=Fields('foo'), context=DatumInContext(value={'foo': [{'baz': 'news'}, {'baz': 'music'}]}, path=This(), context=None)))), DatumInContext(value='music', path=Fields('baz'), context=DatumInContext(value={'baz': 'music'}, path=<jsonpath_rw.jsonpath.Index object at 0x025CA770>, context=DatumInContext(value=[{'baz': 'news'}, {'baz': 'music'}], path=Fields('foo'), context=DatumInContext(value={'foo': [{'baz': 'news'}, {'baz': 'music'}]}, path=This(), context=None))))]

2.获取匹配的数据match.value

jsonpath_expr = parse('foo[*].baz')
data = {'foo': [{'baz': 'news'}, {'baz': 'music'}]}
print([match.value for match in jsonpath_expr.find(data)])
运行结果：
['news', 'music']

3.match.value返回数据是一个list，我们要获取特定的值

jsonpath_expr = parse('foo[*].baz')
data = {'foo': [{'baz': 'news'}, {'baz': 'music'}]}
print([match.value for match in jsonpath_expr.find(data)][0])

运行结果：
news