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File: //usr/local/rvm/src/ruby-2.3.8/ext/tk/sample/tkextlib/iwidgets/sample/spinint.rb

#!/usr/bin/env ruby
# frozen_string_literal: false
require 'tk'
require 'tkextlib/iwidgets'

TkOption.add('*textBackground', 'white')

Tk::Iwidgets::Spinint.new(:labeltext=>'Temperature', :labelpos=>:w, :width=>5,
                          :fixed=>true, :range=>[32, 212]).pack(:pady=>10)

Tk.mainloop