Question

我有一个包含内容的CSV文件：

John,1,2,4,67,100,41,234
Maria,45,23,67,68,300,250

我需要阅读这些内容并将这些数据分成两部分：

1.a Legend1 = John
1.b Legend2 = Maria
2.a Data_array1 = [1,2,4,67,100,41,234]
2.b Data_array2 = [45,23,67,a,67,300,250]

这是我的代码;它读取内容并将内容与','分开。

testsample = CSV.read('samples/linechart.csv')
CSV.foreach('samples/linechart.csv') do |row|
  puts row
end

它的输出结果是一类数组元素。我被困在继续追求它。

Answer 1

我建议不要使用CSV.read，因为它太简单了 - 相反，请使用File.open并读取每一行并将其视为一个大字符串。

例如：

# this turns the file into an array of lines
# eg you now have: ["John,1,2,4,67,100,41,234", "Maria,45,23,67,a,67,300,250"]
lines = File.readlines('samples/linechart.csv')

# if you want to do this for each line, just iterate over this array:
lines.each do |line|

  # now split each line by the commas to turn it into an array of strings
  # eg you have: ["john","1","2","4","67","100","41","234"]
   values = line.split(',')

  # now, grab the first one as you name and the rest of them as an array of strings
  legend = values[0]        # "john"
  data_array = values[1..-1]  # ["1","2","4","67","100","41","234"]

  # now do what you need to do with the name/numbers eg
  puts "#{legend}: [#{data_array.join(',')}]"

  # if you want the second array to be actual numbers instead of strings, you can convert them to numbers using to_i (or to_f if you want floats instead of integers)
  # the following says "take each value and call to_i on it and return the set of new values"
  data_array = data_array.map(&:to_i)

end # end of iterating over the array

Answer 2

首先从csv中获取数据，如：

require 'csv'   
csv_text = File.read('/tmp/a.csv')
csv = CSV.parse(csv_text)
# => [["John", "1", "2", "4", "67", "100", "41", "234"], ["Maria", "45", "23", "67", "a", "67", "300", "250"]]

现在您可以根据您的要求格式化输出。例如：

csv.each.with_index(1){ |a, i|
  puts "Legend#{i.to_s} = #{a[0]}"
}
# Legend1 = John
# Legend2 = Maria

Answer 3

您可以寻找这个，

csv = CSV.new(body)
csv.to_a

您可以查看http://technicalpickles.com/posts/parsing-csv-with-ruby/

如果需要，也可以参考this。

Answer 4

过度设计的版本;）

class Lines
  class Line
    attr_reader :legend, :array

    def initialize(line)
      @line = line
      parse
    end

    private

    def parse
      @legend, *array = @line.strip.split(",")
      @array = array.map(&:to_i)
    end
  end

  def self.parse(file_name)
    File.readlines(file_name).map do |line|
      Line.new(line)
    end
  end
end

Lines.parse("file_name.csv").each do |o|
  p o.legend
  p o.array
  puts
end

# Result:
#
# "John"
# [1, 2, 4, 67, 100, 41, 234]
#
# "Maria"
# [45, 23, 67, 68, 300, 250]

备注：

基本上，Lines.parse("file_name.csv")会为您提供一系列响应方法的对象：legend和array;它分别包含名称和数字数组。

除了笑话，我认为OO将有助于维护。

将CSV中的内容提取到数组中

4 个答案: