有没有办法在Ruby中获取所有变量？

instance_variables.each do |ivar|
  puts "#{ivar} = #{instance_variable_get(ivar)}"
end

local_variables.each do |lvar|
  puts "#{lvar} = #{eval(lvar.to_s)}"
end

global_variables.each do |gvar|
  puts "#{gvar} = #{eval(gvar.to_s)}"
end

def print_variables(binding)
  instance_variables.each do |ivar|
    puts "#{ivar} = #{instance_variable_get(ivar)}"
  end

  local_variables.each do |lvar|
    puts "#{lvar} = #{eval(lvar.to_s)}"
  end

  global_variables.each do |gvar|
    puts "#{gvar} = #{eval(gvar.to_s)}"
  end
end

# 在其他作用域中调用print_variables方法
other_binding = binding
print_variables(other_binding)