有“variable_get”方法吗?如果没有，我如何创造我自己的?

courtesy of irb:

irb的礼貌:

2.0.0-p0 :006 > @instance_variable = "from an instance variable"
 => "from an instance variable" 
2.0.0-p0 :007 > variable = "from a variable"
 => "from a variable" 
2.0.0-p0 :008 > instance_variable_get(:@instance_variable)
 => "from an instance variable" 
2.0.0-p0 :009 > variable_get(:variable)
NoMethodError: undefined method `variable_get' for main:Object
    from (irb):9
    from /usr/local/rvm/rubies/ruby-2.0.0-p0/bin/irb:16:in `<main>'
2.0.0-p0 :010 > 
2.0.0-p0 :006 > @i