Python's 'import' like it

gistfile1.rb

def import(feature, as={})
  ret = require feature
  self.class.instance_eval do
    as.each do |(orig, dest)|
      c = const_get(orig)
      remove_const(orig) if const_defined?(orig)
      const_set(dest, c)
    end
  end unless as.empty?
  ret
end