如何获取字符串中某个具体的数值--通过json.load转化成字典形式获取

r=requests.get(‘http://httpbin.org/get‘).text
print(r)
# print(type(r))
# 如果要获取User-Agent的详细数值，需要做JSON转换
r_json=json.loads(r)
print(r_json)
print(type(r_json))
print(r_json[‘headers‘][‘User-Agent‘])

输出结果为：

 1 "C:\Program Files\Anaconda3\python.exe" "D:/pycharm/test2/python gaoji.py"
 2 {
 3   "args": {}, 4   "headers": {
 5     "Accept": "*/*", 6     "Accept-Encoding": "gzip,deflate", 7     "Connection": "close", 8     "Host": "httpbin.org", 9     "User-Agent": "python-requests/2.11.1"
10   },11   "origin": "114.252.235.73",12   "url": "http://httpbin.org/get"
13 }
14 
15 {‘url‘: ‘http://httpbin.org/get‘,‘headers‘: {‘Connection‘: ‘close‘,‘Accept‘: ‘*/*‘,‘Accept-Encoding‘: ‘gzip,deflate‘,‘Host‘: ‘httpbin.org‘,‘User-Agent‘: ‘python-requests/2.11.1‘},‘origin‘: ‘114.252.235.73‘,‘args‘: {}}
16 <class ‘dict‘>
17 python-requests/2.11.1