从对API的调用结果(使用urllib2)中，我在Python中有一个JSON对象，如下所示：
results = (req).read()
json1 = (results)
这将生成一个包含以下内容的JSON对象(由于大小而被截断)：
"/dochash-1/895ba8ff-4c32-3ae1-9615-9a9a9a1bcb39/cat/1":{
"_typeGroup":"topics",
"category":"/cat/Calais/Entertainment_Culture",
"classifierName":"Calais",
"categoryName":"Entertainment_Culture",
"score":1
},
"/genericHasher-1/b6a2d07d-133b-35ad-85e2-54d524e750cf":{
"_typeGroup":"entities",
"_type":"TVShow",
"name":"Hard Knocks",
"_typeReference":"/1/type/em/e/TVShow",
"instances":[
{
"detection":"[ New York Jets during the summer of 2010 on HBO's ]Hard Knocks[.\n]",
"prefix":" New York Jets during the summer of 2010 on HBO's ",
"exact":"Hard Knocks",
"suffix":".\n",
"offset":135,
"length":11
}
],
"relevance":0.5
},
"/genericHasher-1/802a1ebb-7fac-354f-b02f-6ef8442950d3":{
"_typeGroup":"entities",
"_type":"Organization",
"name":"New York Jets",
"organizationtype":"sports",
"nationality":"American",
"_typeReference":"/1/type/em/e/Organization",
"instances":[
{
"detection":"[ Tebow caught a few training camp glimpses of the ]New York Jets[ during the summer of 2010 on HBO's Hard]",
"prefix":" Tebow caught a few training camp glimpses of the ",
"exact":"New York Jets",
"suffix":" during the summer of 2010 on HBO's Hard",
"offset":86,
"length":13
}
],
"relevance":0.5
}
从此JSON中，仅当“ typeGroup” ==“ entities”时，我才想提取“ _type”和“ name”。
例如，对于上述JSON对象，输出应如下所示：
TVShow: Hard Knocks
Organization: New York Jets.
有人可以帮忙在Python中做到这一点吗？
[更新1]
根据Jatin的回答，我尝试了以下操作：
for key,value in ():
if value["_typeGroup"] == "entities":
print value['_type'], value['name']
但是，这会导致错误KeyError：'_typeGroup'
我试图查看键和值的打印方式，如下所示：
for key,value in ():
print key,value
这导致以下输出(仅显示一个键，值对)：
/genericHasher-1/802a1ebb-7fac-354f-b02f-6ef8442950d3 {u'_typeReference': u'/1/type/em/e/Organization', u'_type': u'Organization', u'name': u'New York Jets', u'_typeGroup': u'entities', u'instances': [{u'suffix': u" during the summer of 2010 on HBO's Hard", u'prefix': u' Tebow caught a few training camp glimpses of the ', u'detection': u"[ Tebow caught a few training camp glimpses of the ]New York Jets[ during the summer of 2010 on HBO's Hard]", u'length': 13, u'offset': 86, u'exact': u'New York Jets'}], u'relevance': 0.5, u'nationality': u'American', u'organizationtype': u'sports'}
它似乎是嵌套的JSON。所以我尝试了以下方法来访问内部键值对，如下所示：
for key,value in ():
val1 = value
for key,value in ():
if value["_typeGroup"] == "entities":
print value['_type'], value['name']
但是，它引发以下错误：
TypeError: string indices must be integers
解决方案
我认为您会收到该错误，因为JSON中的某些值没有_typeGroup。试试这个：
for key,value in ():
if ("_typeGroup", "") == "entities":
print value['_type'], value['name']