在 Ruby 中从文本文件中提取选定的数据

现在我正在用 Ruby 从文本文件中提取信息。 那么如何从以下文本文件中提取数字“0.6748984055823062”？

{
  "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
        },

我尝试过的是，我可以读取一个文件并通过以下代码逐行打印它。

counter = 1
file = File.new("Code.org", "r")
while (line = file.gets)
  puts "#{counter}: #{line}"
  counter = counter + 1
end
file.close

我想将数字设置为变量，以便我可以处理它。

这是一个只提取您想要的分数的脚本。

要记住两件事：

• 您要查找的分数可能不是第一个
• 数据是数组和哈希的混合

json_string = %q${
  "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
        }
      ]
    }
  ]
}
$

require 'json'
json = JSON.parse(json_string)

puts json["sentiment_analysis"].first["positive"].first["score"]
#=> 0.6748984055823062