接口自动化测试中，存在依赖情况：test_04的某个请求参数的值依赖test_03返回结果中的某个字段的数据，所以就需要拿到返回数据中特定字段的值。这里使用到python中的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
jsonpath_expr = parse(‘addCar.product‘) data = {‘addCar‘:{‘product‘: [{‘id‘: ‘1‘,‘price‘:‘38‘}, {‘id‘: ‘32‘,‘price‘:‘19‘}]}} print([match for match in jsonpath_expr.find(data)]) 运行结果：[DatumInContext(value=[{‘id‘: ‘1‘, ‘price‘: ‘38‘}, {‘id‘: ‘32‘, ‘price‘: ‘19‘}], path=Fields(‘product‘), context=DatumInContext(value={‘product‘: [{‘id‘: ‘1‘, ‘price‘: ‘38‘}, {‘id‘: ‘32‘, ‘price‘: ‘19‘}]}, path=Fields(‘addCar‘), context=DatumInContext(value={‘addCar‘: {‘product‘: [{‘id‘: ‘1‘, ‘price‘: ‘38‘}, {‘id‘: ‘32‘, ‘price‘: ‘19‘}]}}, path=This(), context=None)))]
2.获取匹配的数据match.value
from jsonpath_rw import jsonpath,parse
data = {"addCar": {"product": [{"id": "1","price": "38"},{"id": "32", "price": "19"},]}}
jsonpath_expr = parse("addCar.product")
result = [match.value for match in jsonpath_expr.find(data)]
print(result)
运行结果： [[{‘id‘: ‘1‘, ‘price‘: ‘38‘}, {‘id‘: ‘32‘, ‘price‘: ‘19‘}]]
3.获取价格
from jsonpath_rw import jsonpath,parse
data = {"addCar": {"product": [{"id": "1","price": "38"},{"id": "32", "price": "19"},]}}
jsonpath_expr = parse("addCar.product[*].price")
result = [match.value for match in jsonpath_expr.find(data)]
print(result)
运行结果： [‘38‘, ‘19‘]
1.提取值
result = [match.value for match in jsonpath_expr.find({‘foo‘:[{‘baz‘:1}, {‘baz‘:2}]})]
print(result)
>>>[1, 2]
2.获取匹配值对应的路径
from jsonpath_rw import jsonpath,parse
jsonpath_expr = parse(‘foo[*].baz‘)
result = [str(match.full_path) for match in jsonpath_expr.find({‘foo‘: [{‘baz‘: 1}, {‘baz‘: 2}]})]
print(result)
>>>[‘foo.[0].baz‘, ‘foo.[1].baz‘]
3.自动提供id
from jsonpath_rw import jsonpath,parse
result = [match.value for match in parse(‘foo[*].id‘).find({‘foo‘: [{‘id‘: ‘bizzle‘}, {‘baz‘: 3}]})]
print(result)
>>>[‘bizzle‘]
jsonpath.auto_id_field = ‘id‘
result = [match.value for match in parse(‘foo[*].id‘).find({‘foo‘: [{‘id‘: ‘bizzle‘}, {‘baz‘: 3}]})]
print(result)
>>>[‘foo.bizzle‘, ‘foo.[1]‘]
4.扩展功能之一 命名操作符 `parent`
result = [match.value for match in parse(‘a.*.b.`parent`.c‘).find({‘a‘: {‘x‘: {‘b‘: 1, ‘c‘: ‘number one‘}, ‘y‘: {‘b‘: 2, ‘c‘: ‘number two‘}}})]
print(result)
>>>[‘number one‘, ‘number two‘]
原文：https://www.cnblogs.com/DeryKong/p/12983400.html