text: import doctest
  import unittest
  
  import doctest_simple
  
  suite = unittest.TestSuite()
  suite.addTest(doctest.DocTestSuite(doctest_simple))
  suite.addTest(doctest.DocFileSuite('doctest_in_help.txt'))
  
  runner = unittest.TextTestRunner(verbosity=2)
  runner.run(suite)
  