我从Instagram API获得了以下数据，我正在尝试使用以下代码从property获取文本caption：
data = simplejson.load(info) # info is retrieved using the urllib2
for post in data['data']:
if post['caption'] is not "null":
try:
post['caption']['text']
except NameError:
post['caption']['text'] = 0
if post['caption']['text'] is not 0:
print post['caption']['text']
但是在打印unicode字符串时我一直收到TypeError: 'NoneType' object has no attribute '__getitem__'错误+ UnicodeEncodeError: 'charmap' codec can't encode characters in position 0-5: cha
racter maps to <undefined>错误
以下是检索并存储在info
{
"pagination":{
"next_url":"https:\/\/api.instagram.com\/v1\/users\/self\/feed?access_token=184046392.f59def8.c5726b469ad2462f85c7cea5f72083c0&count=3&max_id=247821697921944007_6064449",
"next_max_id":"247821697921944007_6064449"
},
"meta":{
"code":200
},
"data":[
{
"attribution":null,
"tags":[
"usausausa",
"olympics"
],
"type":"image",
"location":{
"latitude":37.785929,
"name":"Aquatech Swim School",
"longitude":-122.278718,
"id":16343815
},
"comments":{
"count":0,
"data":[
]
},
"filter":"Valencia",
"created_time":"1343765260",
"link":"http:\/\/instagr.am\/p\/NwhEktJvEp\/",
"likes":{
"count":0,
"data":[
]
},
"images":{
"low_resolution":{
"url":"http:\/\/distilleryimage1.s3.amazonaws.com\/61d9cbeedb4b11e1b8e822000a1e8b8e_6.jpg",
"width":306,
"height":306
},
"thumbnail":{
"url":"http:\/\/distilleryimage1.s3.amazonaws.com\/61d9cbeedb4b11e1b8e822000a1e8b8e_5.jpg",
"width":150,
"height":150
},
"standard_resolution":{
"url":"http:\/\/distilleryimage1.s3.amazonaws.com\/61d9cbeedb4b11e1b8e822000a1e8b8e_7.jpg",
"width":612,
"height":612
}
},
"caption":{
"created_time":"1343765325",
"text":"Part of my job to watch swimming. #olympics #USAUSAUSA",
"from":{
"username":"kissinkatkelly",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_4672491_75sq_1341713095.jpg",
"id":"4672491",
"full_name":"kissinkatkelly"
},
"id":"247843973390332239"
},
"user_has_liked":false,
"id":"247843429330383145_4672491",
"user":{
"username":"kissinkatkelly",
"website":"",
"bio":"I sing the body electric\r\n\r\nBay Area, CA",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_4672491_75sq_1341713095.jpg",
"full_name":"kissinkatkelly",
"id":"4672491"
}
},
{
"attribution":null,
"tags":[
],
"type":"image",
"location":{
"latitude":36.020832061,
"longitude":-121.548835754
},
"comments":{
"count":4,
"data":[
{
"created_time":"1343763343",
"text":"I wanna cut your mustache off. \ue313\ue313\ue313\ue004",
"from":{
"username":"glorias_noodles",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_24432017_75sq_1343633079.jpg",
"id":"24432017",
"full_name":"\ue340MeGusta Gloria\ue340"
},
"id":"247827343962686703"
},
{
"created_time":"1343763844",
"text":"Ahaha^",
"from":{
"username":"chloe_carter",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_44766575_75sq_1343509145.jpg",
"id":"44766575",
"full_name":"Chloe Carter"
},
"id":"247831551235474746"
},
{
"created_time":"1343763958",
"text":"Amazingg thoo",
"from":{
"username":"saulyp",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_18051263_75sq_1335648741.jpg",
"id":"18051263",
"full_name":"Saul Perez"
},
"id":"247832506790200642"
},
{
"created_time":"1343764298",
"text":"@popesaintvictor where is that? :o",
"from":{
"username":"youknow_jameson",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_194001394_75sq_1343613135.jpg",
"id":"194001394",
"full_name":"Jameson Medina"
},
"id":"247835358103225704"
}
]
},
"filter":"Normal",
"created_time":"1343763202",
"link":"http:\/\/instagr.am\/p\/NwdJRpBkfX\/",
"likes":{
"count":611,
"data":[
{
"username":"jakyvedder",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_18148021_75sq_1336938690.jpg",
"id":"18148021",
"full_name":"Janycken"
},
{
"username":"nadjasinbruker",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_174576513_75sq_1343582260.jpg",
"id":"174576513",
"full_name":"Nadja"
},
{
"username":"vivi11",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_1193390_75sq_1338169730.jpg",
"id":"1193390",
"full_name":"Viviana Rodriguez"
},
{
"username":"me_4_eva",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_181498114_75sq_1343506811.jpg",
"id":"181498114",
"full_name":"Kelly"
},
{
"username":"roxczajkowski",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_9367244_75sq_1343696914.jpg",
"id":"9367244",
"full_name":"Czajkowski \u041a\u043e\u0440\u0448\u0443\u043d\u043e\u0432\u0430"
},
{
"username":"arsi1989",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_201586134_75sq_1343761866.jpg",
"id":"201586134",
"full_name":"Arsalan MemOn"
},
{
"username":"puppyluva",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_201579504_75sq_1343760137.jpg",
"id":"201579504",
"full_name":"puppyluva"
},
{
"username":"paulinamurr",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_49364097_75sq_1343428499.jpg",
"id":"49364097",
"full_name":"Paulina Murray"
},
{
"username":"_mcquadeface_",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_20679753_75sq_1327617901.jpg",
"id":"20679753",
"full_name":"Emily McQuade"
}
]
},
"images":{
"low_resolution":{
"url":"http:\/\/distilleryimage11.s3.amazonaws.com\/96cd5b90db4611e1827612313814176c_6.jpg",
"width":306,
"height":306
},
"thumbnail":{
"url":"http:\/\/distilleryimage11.s3.amazonaws.com\/96cd5b90db4611e1827612313814176c_5.jpg",
"width":150,
"height":150
},
"standard_resolution":{
"url":"http:\/\/distilleryimage11.s3.amazonaws.com\/96cd5b90db4611e1827612313814176c_7.jpg",
"width":612,
"height":612
}
},
"caption":null,
"user_has_liked":false,
"id":"247826160271378391_605400",
"user":{
"username":"popesaintvictor",
"website":"http:\/\/popesaintvictor.com",
"bio":"artist, friend, and brand designer for blood:water mission in nashville, tennessee. \r\n\r\nhusband to @ohsoamy\r\n\r\nbe inspired. be awesome.\r\n",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_605400_75sq_1342893414.jpg",
"full_name":"pope saint victor",
"id":"605400"
}
},
{
"attribution":null,
"tags":[
],
"type":"image",
"location":{
"latitude":40.738834381,
"longitude":-73.994163513
},
"comments":{
"count":6,
"data":[
{
"created_time":"1343762733",
"text":"Nice :)",
"from":{
"username":"belieberpernille99",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_186196238_75sq_1341347304.jpg",
"id":"186196238",
"full_name":"official belieber"
},
"id":"247822232418879860"
},
{
"created_time":"1343762748",
"text":"Those pants \ud83d\ude0d",
"from":{
"username":"morganmarzulli",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_29155556_75sq_1337653621.jpg",
"id":"29155556",
"full_name":"morganmarzulli"
},
"id":"247822351461615990"
},
{
"created_time":"1343762777",
"text":"That outfit is to die for. I love her pants! They're so fun. \ud83d\udc4d",
"from":{
"username":"ninavnegron",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_18421926_75sq_1343356820.jpg",
"id":"18421926",
"full_name":"Nina V"
},
"id":"247822600452278654"
},
{
"created_time":"1343762782",
"text":"YEAH THEIR COOL",
"from":{
"username":"belieberpernille99",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_186196238_75sq_1341347304.jpg",
"id":"186196238",
"full_name":"official belieber"
},
"id":"247822639375419775"
},
{
"created_time":"1343762782",
"text":"Another day another shoot! Look out for me and my chicest staff on @racked!",
"from":{
"username":"rebeccaminkoff",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_6064449_75sq_1332274636.jpg",
"id":"6064449",
"full_name":"Rebecca Minkoff"
},
"id":"247822641497737600"
},
{
"created_time":"1343764430",
"text":"Hot mama! Miss you!",
"from":{
"username":"ashleekoston",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_12925089_75sq_1340081366.jpg",
"id":"12925089",
"full_name":"ashleekoston"
},
"id":"247836463642020446"
}
]
},
"filter":"Walden",
"created_time":"1343762670",
"link":"http:\/\/instagr.am\/p\/NwcIVwRYnH\/",
"likes":{
"count":528,
"data":[
{
"username":"claireyoung48",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_40091175_75sq_1338778945.jpg",
"id":"40091175",
"full_name":"claireyoung48"
},
{
"username":"l_christine_k",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_14871166_75sq_1341962995.jpg",
"id":"14871166",
"full_name":"Lauren Kawano"
},
{
"username":"grcdaly",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_41426567_75sq_1335023058.jpg",
"id":"41426567",
"full_name":"\u24bc\u24c7\u24b6\u24b8\u24ba \u24b9\u24b6\u24c1\u24e8"
},
{
"username":"vanessaalcalaa",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_18115905_75sq_1342828120.jpg",
"id":"18115905",
"full_name":"Vanessa Alcala"
},
{
"username":"makennalenover",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_6464394_75sq_1343268613.jpg",
"id":"6464394",
"full_name":"Makenna Lenover"
},
{
"username":"heyitsmaryanne",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_623979_75sq_1340838647.jpg",
"id":"623979",
"full_name":"Maryanne L"
},
{
"username":"sarabeen",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/anonymousUser.jpg",
"id":"6463387",
"full_name":"sarabeen"
},
{
"username":"boldincrimson",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_191122242_75sq_1341889110.jpg",
"id":"191122242",
"full_name":"Pilar Chapa"
},
{
"username":"elizzabethhope",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_6761399_75sq_1342553102.jpg",
"id":"6761399",
"full_name":"Lizz\u270c"
}
]
},
"images":{
"low_resolution":{
"url":"http:\/\/distilleryimage7.s3.amazonaws.com\/59bc708edb4511e1b7ea22000a1cbb16_6.jpg",
"width":306,
"height":306
},
"thumbnail":{
"url":"http:\/\/distilleryimage7.s3.amazonaws.com\/59bc708edb4511e1b7ea22000a1cbb16_5.jpg",
"width":150,
"height":150
},
"standard_resolution":{
"url":"http:\/\/distilleryimage7.s3.amazonaws.com\/59bc708edb4511e1b7ea22000a1cbb16_7.jpg",
"width":612,
"height":612
}
},
"caption":null,
"user_has_liked":false,
"id":"247821697921944007_6064449",
"user":{
"username":"rebeccaminkoff",
"website":"http:\/\/www.rebeccaminkoff.com",
"bio":"The Downtown Romantic. My life, my work, my world.",
"profile_picture":"http:\/\/images.instagram.com\/profiles\/profile_6064449_75sq_1332274636.jpg",
"full_name":"Rebecca Minkoff",
"id":"6064449"
}
}
]
}
答案 0 :(得分：25)
对于帖子标题，您不需要对“文本”进行错综复杂的测试。 此代码适用于您发布的JSON字符串：
for post in data['data']:
if post.get('caption'):
print post['caption'].get('text', 0)
此外，你可以更加防守，并在启动循环时引用data.get('data', [])，以防Instagram向你发送空的JSON。
答案 1 :(得分：7)
基本上当json加载和反序列化你的对象时，JSON中的null将成为python中的None。
所以你的行：
if post['caption'] is not 'null':
应该成为：
if post['caption']: