Modernize test_wmi (#579)

* remove bridges for old Python and unused imports

* delint comment

* add type annotations

comtypes/test/test_wmi.py

@@ -1,25 +1,18 @@
-import sys
 import unittest as ut
-from ctypes import POINTER
+
 from comtypes.client import CoGetObject
 from comtypes.test import requires
 
 requires("time")
 
-if sys.version_info >= (3, 0):
-    base_text_type = str
-    text_type = str
-else:
-    base_text_type = basestring
-    text_type = unicode
 
 # WMI has dual interfaces.
 # Some methods/properties have "[out] POINTER(VARIANT)" parameters.
 # This test checks that these parameters are returned as strings:
 # that's what VARIANT.__ctypes_from_outparam__ does.
 class Test(ut.TestCase):
     def test_wmi(self):
-        wmi = CoGetObject("winmgmts:")
+        wmi: "WbemScripting.ISWbemServices" = CoGetObject("winmgmts:")
         disks = wmi.InstancesOf("Win32_LogicalDisk")
 
         # There are different typelibs installed for WMI on win2k and winXP.
@@ -28,34 +21,34 @@ def test_wmi(self):
         #     import comtypes.gen._565783C6_CB41_11D1_8B02_00600806D9B6_0_1_1 as mod
         #   WinXP:
         #     import comtypes.gen._565783C6_CB41_11D1_8B02_00600806D9B6_0_1_2 as mod
-        # So, the one that's referenced onm WbemScripting will be used, whether the actual
-        # typelib is available or not.  XXX
+        # So, the one that's referenced onm WbemScripting will be used, whether the
+        # actual typelib is available or not.  XXX
         from comtypes.gen import WbemScripting
 
         WbemScripting.wbemPrivilegeCreateToken
 
         for item in disks:
             # obj[index] is forwarded to obj.Item(index)
             # .Value is a property with "[out] POINTER(VARIANT)" parameter.
+            item: "WbemScripting.ISWbemObject"
             a = item.Properties_["Caption"].Value
             b = item.Properties_.Item("Caption").Value
             c = item.Properties_("Caption").Value
             self.assertEqual(a, b)
             self.assertEqual(a, c)
-            self.assertTrue(isinstance(a, base_text_type))
-            self.assertTrue(isinstance(b, base_text_type))
-            self.assertTrue(isinstance(c, base_text_type))
+            self.assertTrue(isinstance(a, str))
+            self.assertTrue(isinstance(b, str))
+            self.assertTrue(isinstance(c, str))
             result = {}
             for prop in item.Properties_:
-                self.assertTrue(isinstance(prop.Name, base_text_type))
+                prop: "WbemScripting.ISWbemProperty"
+                self.assertTrue(isinstance(prop.Name, str))
                 prop.Value
                 result[prop.Name] = prop.Value
                 # print "\t", (prop.Name, prop.Value)
             self.assertEqual(len(item.Properties_), item.Properties_.Count)
             self.assertEqual(len(item.Properties_), len(result))
-            self.assertTrue(
-                isinstance(item.Properties_["Description"].Value, text_type)
-            )
+            self.assertTrue(isinstance(item.Properties_["Description"].Value, str))
         # len(obj) is forwared to obj.Count
         self.assertEqual(len(disks), disks.Count)