python模块05-json

3 请求数据提取：json

3.1 json类型数据

json对象：{key:calue}

json数组：[1,2,3,4]

3.2 json模块

1） json.loads

把Json格式字符串解码转换成Python对象（json数组对应列表，json对象对应字典）
注意点：python中的None，在json中使用null来标识

2）json.dumps

实现python类型转换为json字符串，返回有个str对象把有个python对象编码转换成json字符串
注意：json.dumps()序列化时默认使用的ascii编码
添加参数ensure_ascii = False禁用ascii编码，按utf-8编码

python">url = 'http://httpbin.org/post'
#dumps将python对象转换为Json数据
data_json = json.dumps({'stock_no':'600585','price':'52.12'})
res = requests.post(url, data_json)
print(res)
print(res.text)
print(res.content)
print(res.json())"""结果
<Response [200]>
{"args": {}, "data": "{\"stock_no\": \"600585\", \"price\": \"52.12\"}", "files": {}, "form": {}, "headers": {"Accept": "*/*", "Accept-Encoding": "gzip, deflate", "Content-Length": "40", "Host": "httpbin.org", "User-Agent": "python-requests/2.32.3", "X-Amzn-Trace-Id": "Root=1-66cb51d7-7c500fe92870796a2f2c7e8e"}, "json": {"price": "52.12", "stock_no": "600585"}, "origin": "172.104.189.197", "url": "http://httpbin.org/post"
}b'{\n  "args": {}, \n  "data": "{\\"stock_no\\": \\"600585\\", \\"price\\": \\"52.12\\"}", \n  "files": {}, \n  "form": {}, \n  "headers": {\n    "Accept": "*/*", \n    "Accept-Encoding": "gzip, deflate", \n    "Content-Length": "40", \n    "Host": "httpbin.org", \n    "User-Agent": "python-requests/2.32.3", \n    "X-Amzn-Trace-Id": "Root=1-66cb51d7-7c500fe92870796a2f2c7e8e"\n  }, \n  "json": {\n    "price": "52.12", \n    "stock_no": "600585"\n  }, \n  "origin": "172.104.189.197", \n  "url": "http://httpbin.org/post"\n}\n'{'args': {}, 'data': '{"stock_no": "600585", "price": "52.12"}', 'files': {}, 'form': {}, 'headers': {'Accept': '*/*', 'Accept-Encoding': 'gzip, deflate', 'Content-Length': '40', 'Host': 'httpbin.org', 'User-Agent': 'python-requests/2.32.3', 'X-Amzn-Trace-Id': 'Root=1-66cb527f-3f933ec779160df739e51cc2'}, 'json': {'price': '52.12', 'stock_no': '600585'}, 'origin': '172.104.189.197', 'url': 'http://httpbin.org/post'}"""

3）jsonPath模块

JsonPath,用于是提取JSON数据中的指定数据