当Python认为dict中的值是字符串时，如何在dict中找到最大值？
我正在和——我想建立一个小doo-dad，将我所有的帖子拉到我的各种Tumblr中，并每周将它们归档到我的WordPress博客中 因此，每次脚本运行时，我都要记录max post id。因此，我正在尝试这样做：当Python认为dict中的值是字符串时，如何在dict中找到最大值？,python,json,tumblr,Python,Json,Tumblr,我正在和——我想建立一个小doo-dad，将我所有的帖子拉到我的各种Tumblr中，并每周将它们归档到我的WordPress博客中 因此，每次脚本运行时，我都要记录max post id。因此，我正在尝试这样做： jdata = json.loads(rawjson) jposts = jdata['response']['posts'] for post in jposts: print post['id'] print max(jposts[
jdata = json.loads(rawjson)
jposts = jdata['response']['posts']
for post in jposts:
print post['id']
print max(jposts['id'])
列表索引必须是整数，而不是str打印类型（post['id']）rawjson{
"meta":{
"status":200,
"msg":"OK"
},
"response":{
"blog":{
"title":"Scipsy",
"name":"scipsy",
"posts":8524,
"url":"http:\/\/scipsy.tumblr.com\/",
"updated":1365196814,
"description":"\u0022Science is interesting and if you don\u0027t agree, fuck off\u0022",
"ask":true,
"ask_anon":true,
"is_nsfw":false,
"share_likes":false
},
"posts":[
{
"blog_name":"scipsy",
"id":47218422365,
"post_url":"http:\/\/scipsy.tumblr.com\/post\/47218422365\/you-are-missed-that-is-all",
"slug":"you-are-missed-that-is-all",
"type":"answer",
"date":"2013-04-05 21:20:14 GMT",
"timestamp":1365196814,
"state":"published",
"format":"html",
"reblog_key":"slI4NU3a",
"tags":[
"maybe I should start another blog",
"or maybe not",
"Maybe I have a concussion from all the throws received during judo and I\u0027m not thinking straight",
"yeah I think that\u0027s it"
],
"short_url":"http:\/\/tmblr.co\/ZW3EPyh_R-9T",
"highlighted":[
],
"note_count":35,
"asking_name":"psydoctor8",
"asking_url":"http:\/\/psydoctor8.tumblr.com\/",
"question":"you are missed. that is all.",
"answer":"\u003Cp\u003EAlthough this break from tumblr have had some positive effects on me (I\u2019ve stopped from compulsively sifting through the NASA\u2019s archive like a maniac and I no longer fell the need to stay up all night trying to answer the most absurd questions) I have to admit that I miss all this sciency stuff and I miss a lot the awesome people I’ve known through this silly blog.\u003C\/p\u003E"
},
{
"blog_name":"scipsy",
"id":32267453988,
"post_url":"http:\/\/scipsy.tumblr.com\/post\/32267453988\/in-the-last-months-this-blog-has-experienced-a",
"slug":"in-the-last-months-this-blog-has-experienced-a",
"type":"text",
"date":"2012-09-25 16:31:00 GMT",
"timestamp":1348590660,
"state":"published",
"format":"html",
"reblog_key":"0EMwke5R",
"tags":[
],
"short_url":"http:\/\/tmblr.co\/ZW3EPyU3IaOa",
"highlighted":[
],
"note_count":246,
"title":null,
"body":"\u003Cp\u003EIn the last months this blog has experienced a progressive decline in the number of produced posts. There are several reasons that come to my mind to explain why is that, but probably the better one is about the fact that I lost motivation. Unexpectedly, despite the lack of regular updates the blog gained more and more followers. [That’s flattering, but at the same time makes me suspicious about the relationship between quality of a blog and number of followers.]\u00a0\u003C\/p\u003E\n\u003Cp\u003EAnyway, I always feel a little lost when I follow a blog and it slowly fades away, and then it just stops posting, without saying anything, so I thought to make this post.\u003C\/p\u003E\n\u003Cp\u003EI’m not going to update \u003Cem\u003Escipsy\u003C\/em\u003E anymore. This could change, but for now I don’t feel like posting here anymore. I’m not going to delete it.\u003C\/p\u003E\n\u003Cp\u003EIf someone would like to stay in touch, just send a message or something. This is my mail: \u003Cem\u003Edr.scipsy@gmail.com\u003C\/em\u003E\u003C\/p\u003E\n\u003Cp\u003EIf someone is wondering: “\u003Cem\u003EWho will fill my dash with science now?\u003C\/em\u003E\u0022 here’s a list of \u003Cem\u003Esciency\u003C\/em\u003E tumblr I followed:\u003C\/p\u003E\n\u003Cul\u003E\u003Cli\u003E\u003Ca href=\u0022http:\/\/psydoctor8.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Epsydoctor8\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/electricorchid.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Eelectricorchid\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/gradmom.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Egradmom\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/www.itsokaytobesmart.com\/\u0022 target=\u0022_blank\u0022\u003Eitsokaytobesmart\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/realcleverscience.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Erealcleverscience\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/scientistintraining.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Escientistintraining\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/crookedindifference.com\/\u0022 target=\u0022_blank\u0022\u003Ecrookedindifference\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/ohyeahdevelopmentalbiology.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Eohyeahdevelopmentalbiology\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/scienceisbeauty.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Escienceisbeauty\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/fuckyeahneuroscience.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Efuckyeahneuroscience\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/climateadaptation.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Eclimateadaptation\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/exp.lore.com\/\u0022 target=\u0022_blank\u0022\u003Eexp.lore\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/xenogifh.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Exenogifh\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/www.ziyadnazem.info\/\u0022 target=\u0022_blank\u0022\u003Eziyadnazem\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/intothecontinuum.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Eintothecontinuum\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/approachingsignificance.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Eapproachingsignificance\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/sciencesoup.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Esciencesoup\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/blog.matthen.com\/\u0022 target=\u0022_blank\u0022\u003Ematthen\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/ulaulaman.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Eulaulaman\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/mindovermatterzine.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Emindovermatterzine\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/doctorswithoutborders.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Edoctorswithoutborders\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/mothernaturenetwork.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Emothernaturenetwork\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/wnycradiolab.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Ewnycradiolab\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/blog.nysci.org\/\u0022 target=\u0022_blank\u0022\u003Enysci\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/amnhnyc.tumblr.com\u0022 target=\u0022_blank\u0022\u003Eamnhnyc\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/discoverynews.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Ediscoverynews\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/tumblr.poptech.org\/\u0022 target=\u0022_blank\u0022\u003Epoptech\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/retina.smithsonianmag.com\/\u0022 target=\u0022_blank\u0022\u003Eretina.smithsonianmag\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/onearth.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Eonearth\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/huffpostscience.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Ehuffpostscience\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/bpod-mrc.tumblr.com\/\u0022 target=\u0022_blank\u0022\u003Ebpod-mrc\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli\u003E\u003Ca href=\u0022http:\/\/blog.tedx.com\/\u0022 target=\u0022_blank\u0022\u003Etedx\u003C\/a\u003E\u003C\/li\u003E\n\u003C\/ul\u003E\u003Cp\u003EThat’s it, I think.\u003C\/p\u003E\n\u003Cp\u003E\u003Csmall\u003E\u003Cem\u003ESo long, and thanks for all the fish.\u003C\/em\u003E\u003C\/small\u003E\u003C\/p\u003E"
}
],
"total_posts":8524
}
}
jPosts = [{'id':123},{'id':54233},etc] #example
jPosts['id']jPosts[0]['id']max(jPosts,key=lambda item:item['id']) #compare based on EACH items 'id' field
jPosts = [{'id':123},{'id':54233},etc] #example
jPosts['id']jPosts[0]['id']max(jPosts,key=lambda item:item['id']) #compare based on EACH items 'id' field
键from operator import itemgetter
print max(jPosts, key=itemgetter('id'))['id'] # prints 47218422365
键from operator import itemgetter
print max(jPosts, key=itemgetter('id'))['id'] # prints 47218422365
我几乎在解决方案中使用了itemgetter，但觉得lambda更具可读性。。。但仍然是+1，因为这解决了他的问题issue@JoranBeasley谢谢，你是第一个用正确的答案回答的人，你的答案也是+1:）我使用
lambdalambdamax（jPosts，key=lambda item:item['id']）['id']max（jPosts，key=lambda item:item['id']）['id']