使用jsonpath，可以大大減少開(kāi)發(fā)量蹦疑。
為了能像寫(xiě)XPath一樣寫(xiě)json路徑，Stefan Goessner開(kāi)發(fā)了jsonpath（https://goessner.net/articles/JsonPath/）萨驶。
jsonpath也有Python實(shí)現(xiàn)（https://github.com/kennknowles/python-jsonpath-rw）歉摧。
安裝方式：pip install jsonpath-rw。
簡(jiǎn)單使用：
from jsonpath_rw import jsonpath, parse
jsonpath_expr = parse('foo[*].baz')
print(jsonpath_expr)
print([match.value for match in jsonpath_expr.find({'foo': [{'baz': 1}, {'baz': 2}]})])
print([str(match.full_path) for match in jsonpath_expr.find({'foo': [{'baz': 1}, {'baz': 2}]})])
jsonpath.auto_id_field = 'id'
print([match.value for match in parse('foo[*].id').find({'foo': [{'id': 'bizzle'}, {'baz': 3}]})])
print([match.value for match in parse('a.*.b.`parent`.c').find({'a': {'x': {'b': 1, 'c': 'number one'}, 'y': {'b': 2, 'c': 'number two'}}})])
另一個(gè)例子腔呜，獲取所有author字段：
dict = { "store": {
"book": [
{ "category": "reference",
"author": "Nigel Rees",
"title": "Sayings of the Century",
"price": 8.95
},
{ "category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": 12.99
},
{ "category": "fiction",
"author": "Herman Melville",
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"price": 8.99
},
{ "category": "fiction",
"author": "J. R. R. Tolkien",
"title": "The Lord of the Rings",
"isbn": "0-395-19395-8",
"price": 22.99
}
],
"bicycle": {
"color": "red",
"price": 19.95
}
}
}
from jsonpath_rw import parse
jsonpath_expr = parse('$..author')
res = jsonpath_expr.find(dict)
print([match.value for match in res])
對(duì)36氪的快訊接口解析叁温，只要知道最終要取的字段名就好，不用寫(xiě)完整的字典取值核畴，可以省不少事：
import requests
import json
from jsonpath_rw import parse
header = {
'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 '
'(KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36'
}
url = 'https://36kr.com/api/newsflash?&per_page=20'
response = requests.get(url,
headers=header,
timeout=5
)
dict = json.loads(response.text)
jsonpath_expr = parse('$..title, description, published_at')
res = jsonpath_expr.find(dict)
print([match.value for match in res])
jsonpath的詳細(xì)語(yǔ)法可參考：
https://github.com/kennknowles/python-jsonpath-rw
