从 Ruby 中的 JSON 文件解析并从嵌套哈希中提取数字
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Parsing from a JSON file in Ruby and Extract numbers from Nested Hashes
提问by Sookie J
Now I am working on extracting information from a JSON file in Ruby. Then how can I extract just the numbers next to the word 'score' from the following text file? For example, I want to get 0.6748984055823062, 0.6280145725181376 on and on.
现在我正在从 Ruby 中的 JSON 文件中提取信息。那么如何从以下文本文件中仅提取单词“分数”旁边的数字？例如，我想得到 0.6748984055823062、0.6280145725181376 等等。
{
"sentiment_analysis": [
{
"positive": [
{
"sentiment": "Popular",
"topic": "games",
"score": 0.6748984055823062,
"original_text": "Popular games",
"original_length": 13,
"normalized_text": "Popular games",
"normalized_length": 13,
"offset": 0
},
{
"sentiment": "engaging",
"topic": "pop culture-inspired games",
"score": 0.6280145725181376,
"original_text": "engaging pop culture-inspired games",
"original_length": 35,
"normalized_text": "engaging pop culture-inspired games",
"normalized_length": 35,
"offset": 370
},
"negative": [
{
"sentiment": "get sucked into",
"topic": "the idea of planning",
"score": -0.7923352042939829,
"original_text": "Students get sucked into the idea of planning",
"original_length": 45,
"normalized_text": "Students get sucked into the idea of planning",
"normalized_length": 45,
"offset": 342
},
{
"sentiment": "be daunted",
"topic": null,
"score": -0.5734506634410159,
"original_text": "initially be daunted",
"original_length": 20,
"normalized_text": "initially be daunted",
"normalized_length": 20,
"offset": 2104
},
What I have tried is that I could read a file and set the text file to a hash variable using the JSON method.
我尝试过的是，我可以读取文件并使用 JSON 方法将文本文件设置为哈希变量。
require 'json'
json = JSON.parse(json_string)
采纳答案by Arun Kumar Mohan
You can use Array#mapto collect the reviews.
您可以Array#map用来收集评论。
reviews = json['sentiment_analysis'][0]
positive_reviews = reviews['positive']
negative_reviews = reviews['negative']
positive_reviews.map { |review| review['score'] }
=> [0.6748984055823062, 0.6280145725181376]
negative_reviews.map { |review| review['score'] }
=> [-0.7923352042939829, -0.5734506634410159]
Hope this helps!
希望这可以帮助！
回答by Michal ?tein
Using the JSONclass:
使用JSON类：
Importing a file:
导入文件：
require "json"
file = File.open "/path/to/your/file.json"
data = JSON.load file
Optionally, you can close it now:
或者，您现在可以关闭它：
file.close
The file looks like this:
该文件如下所示：
{
"title": "Facebook",
"url": "https://www.facebook.com",
"posts": [
"lemon-car",
"dead-memes"
]
}
The file is now able to be read like this:
现在可以像这样读取文件：
data["title"]
=> "Facebook"
data.keys
=> ["title", "url", "posts"]
data['posts']
=> ["lemon-car", "dead-memes"]
data["url"]
=> "https://www.facebook.com"
Hope this helped!
希望这有帮助！
回答by Blair Anderson
Parse Data from File
从文件解析数据
data_hash = JSON.parse(File.read('file-name-to-be-read.json'))
data_hash = JSON.parse(File.read('file-name-to-be-read.json'))
Then just map over the data!
然后只需映射数据！
reviews = data_hash['sentiment_analysis'].first
reviews.map do |sentiment, reviews|
puts "#{sentiment} #{reviews.map { |review| review['score'] }}"
end
I think this is the simplest answer.
我认为这是最简单的答案。
