python中eval()和json.dumps的使用 - 火磷

在python中通过requests.get(url)获取json数据，此时可能需要eval进行解析。

 1 # -*- coding: utf-8 -*-
 2 import requests
 3 
 4 r = requests.get(url='your url address')  # 最基本的GET请求
 5 # print r.content
 6 # print '......................'
 7 # print len(r.json()
 8 # print '......................'
 9 # print len(r.json()['data'])
10 # print '......................'
11 print r.json()['data'][6]['type']          # area
12 print '......................'
13 print r.json()['data'][6]['radarcoor']
14 print '......................'
15 print r.json()['data'][6]['radarcoor'][0]      # 错误
16 print '......................'
17 print eval("r.json()['data'][6]['radarcoor']")[0]           # 错误
18 print '......................'
19 print eval("("+r.json()['data'][6]['radarcoor']+")")[0]       # 正确的写法

此时r.json()返回：

r.json()['data'][6]['radarcoor']返回：

要获取其中每一项，则需要使用eval()函数进行解析：

2.json.dumps()

功能：将python中的数据类型转换成str类型

 1 # json.dumps()
 2 mylist = [123, {'name': 'dragon'}, {'location': ('ch', 'nt')}]
 3 encoded_json = json.dumps(mylist)
 4 print isinstance(encoded_json, str)  # True
 5 print encoded_json       # [123, {"name": "dragon"}, {"location": ["ch", "nt"]}]
 6 
 7 # json.loads()
 8 # decoded_json = json.loads(encoded_json)
 9 # print isinstance(decoded_json, list)      # True
10 # print decoded_json     # [123, {u'name': u'dragon'}, {u'location': [u'ch', u'nt']}]
11 
12 # eval()
13 decoded_json = eval(encoded_json)
14 print isinstance(decoded_json, list)  # True
15 print decoded_json       # [123, {'name': 'dragon'}, {'location': ['ch', 'nt']}]

posted on 2017-08-09 09:59 火磷阅读(3474) 评论(0) 收藏举报

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