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在做項(xiàng)目的時(shí)候,遇到這樣的數(shù)據(jù):
"trends": [ { "name": "Rick Gates", "promoted_content": null, "query": "%22Rick+Gates%22", "tweet_volume": 135732, "url": "http://twitter.com/search?q=%22Rick+Gates%22" }, { "name": "#TheBachelorette", "promoted_content": null, "query": "%23TheBachelorette", "tweet_volume": 91245, "url": "http://twitter.com/search?q=%23TheBachelorette" }, { "name": "#KremlinAnnex", "promoted_content": null, "query": "%23KremlinAnnex", "tweet_volume": 42654, "url": "http://twitter.com/search?q=%23KremlinAnnex" }, { "name": "#LHHH", "promoted_content": null, "query": "%23LHHH", "tweet_volume": 35252, "url": "http://twitter.com/search?q=%23LHHH" }]
我需要做的就是根據(jù)tweet_volume的數(shù)值對(duì)trends里的元素進(jìn)行排序。
實(shí)現(xiàn)代碼:
把上面數(shù)據(jù)以字典的方式獲取,相當(dāng)于把取出的就是后面的列表,即
trends=[ { "name": "Rick Gates", "promoted_content": null, "query": "%22Rick+Gates%22", "tweet_volume": 135732, "url": "http://twitter.com/search?q=%22Rick+Gates%22" }, { "name": "#TheBachelorette", "promoted_content": null, "query": "%23TheBachelorette", "tweet_volume": 91245, "url": "http://twitter.com/search?q=%23TheBachelorette" }, { "name": "#KremlinAnnex", "promoted_content": null, "query": "%23KremlinAnnex", "tweet_volume": 42654, "url": "http://twitter.com/search?q=%23KremlinAnnex" }, { "name": "#LHHH", "promoted_content": null, "query": "%23LHHH", "tweet_volume": 35252, "url": "http://twitter.com/search?q=%23LHHH" }] trends = sorted(trends,key = lambda e:e['tweet_volume'],reverse = True)
考慮到有些數(shù)據(jù)是NULL,因此需要提前做個(gè)處理,對(duì)于空的tweet_volume設(shè)置為0,完整代碼:
for item in trends: if(item.get('tweet_volume') is None): item['tweet_volume'] = 0 trends = sorted(trends,key = lambda e:.get('tweet_volume') ,reverse = True)
建議用get方式獲取,空值或數(shù)據(jù)不存在這樣不會(huì)報(bào)錯(cuò)。
在Python文檔中看到一種性能更高的方法
通過使用 operator 模塊的 itemgetter 函數(shù),可以非常容易的排序這樣的數(shù)據(jù)結(jié)構(gòu)
因此上面的程序可以改寫成
from operator import itemgetter for item in trends: if(item.get('tweet_volume') is None): item['tweet_volume'] = 0 trends = sorted(trends,key = itemgetter('tweet_volume'),reverse = True)
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