Python refactoring

- Optimize imports
- Adjust coding style to PEP8
- Remove obsolete comments

test/dom.t

@@ -26,30 +26,15 @@
 #
 ###############################################################################
 
-import sys
 import os
+import sys
 import unittest
-from datetime import datetime
+
 # Ensure python finds the local simpletap module
 sys.path.append(os.path.dirname(os.path.abspath(__file__)))
 
 from basetest import Timew, TestCase
 
-# Test methods available:
-#     self.assertEqual(a, b)
-#     self.assertNotEqual(a, b)
-#     self.assertTrue(x)
-#     self.assertFalse(x)
-#     self.assertIs(a, b)
-#     self.assertIsNot(substring, text)
-#     self.assertIsNone(x)
-#     self.assertIsNotNone(x)
-#     self.assertIn(substring, text)
-#     self.assertNotIn(substring, text
-#     self.assertRaises(e)
-#     self.assertRegexpMatches(text, pattern)
-#     self.assertNotRegexpMatches(text, pattern)
-#     self.tap("")
 
 class TestDOM(TestCase):
     def setUp(self):
@@ -166,6 +151,7 @@ class TestDOM(TestCase):
         code, out, err = self.t("get dom.tracked.count")
         self.assertEqual('0\n', out)
 
+
 class TestDOMTracked(TestCase):
     @classmethod
     def setUpClass(cls):
@@ -247,6 +233,7 @@ class TestDOMTracked(TestCase):
         code, out, err = self.t("get dom.tracked.1.json")
         self.assertRegexpMatches(out, r'{"start":"\d{8}T\d{6}Z"}')
 
+
 class TestDOMRC(TestCase):
     def setUp(self):
         """Executed before each test in the class"""
@@ -260,6 +247,7 @@ class TestDOMRC(TestCase):
         """Test dom.rc.debug"""
         code, out, err = self.t("get dom.rc.debug")
 
+
 if __name__ == "__main__":
     from simpletap import TAPTestRunner
     unittest.main(testRunner=TAPTestRunner())