Ruby中的简单“需要”问题

为了学习Ruby,我跟随“为什么是Ruby的辛酸指南”,当他第一次介绍“Require”方法时,我遇到了一些问题(?)在他的教程中。

实际上,我制作了一个名为“wordlist.rb”的文件,其中包含:

  code_words = {
  'starmonkeys' => 'Phil and Pete, those prickly chancellors of the New Reich',
  'catapult' => 'chucky go-go', 'firebomb' => 'Heat-Assisted Living',
  'Nigeria' => "Ny and Jerry's Dry Cleaning (with Donuts)",
  'Put the kabosh on' => 'Put the cable box on'
}

然后我又有一个叫“files.rb”的RubyScipt:

require 'wordlist'

#Get evil idea and swap in code words
print "Enter your new idea: "
idea = gets

#real will have the key and code will have the value
#Method followed by ! (like gsub!) are known as destructive methods
code_words.each do |real, code|
    safe_idea = idea.gsub!( real,code )
end

#Save the jibberish to a new file
print "File encoded. Please enter a name for this idea: "
idea_name  = gets.strip

File::open( "idea-" + idea_name + ".txt", "w") do |f|
    f 

当我尝试运行Ruby脚本时,我得到:

files.rb:9: undefined local variable or method `code_words' for main:Object (NameError)

知道如何使“require”正确地用于引用单词表吗?