new_contents: __author__ = 'Valeria'
  import unittest
  from radix import *
  from timeit import timeit
  
  class TestRadixPerformance(unittest.TestCase):
      def test_perf(self):
          def testtime():
              for i in range(1000):
                  cast(i, 16, 32)
          timeit(testtime, number=1000)
  
  class TestRadixMethods(unittest.TestCase):
  
      def test_to_base_10(self):
          self.assertEqual(to_base_10('cfa7291', 25), '3080188976')
  
      def test_from_base_10(self):
          self.assertEqual(from_base_10('1465324', 15), '1de284')
  
      def test_cast(self):
          self.assertEqual(cast('51330od', 26, 36), 'privet')
  
      def test_from_base_10_exception(self):
          with self.assertRaises(Exception):
              from_base_10('a453', 12)
  
      def test_to_base_10_exception(self):
          with self.assertRaises(Exception):
              to_base_10('a453', 9)
  
      def test_cast_exception(self):
          with self.assertRaises(Exception):
              cast('9453', 9, 5)
  
  if __name__ == '__main__':
      unittest.main()
subject: Structure change