Handle type errors in nose/plugins/

Minor adjustments to pass mypy. Mostly applying some missing
annotations.
For one of these, the fix is actually to annotate a type in
`nose2/events.py`.

nose2/events.py

@@ -3,6 +3,7 @@
 # code developed in reference to that module and others within unittest2.
 # unittest2 is Copyright (c) 2001-2010 Python Software Foundation; All
 # Rights Reserved. See: http://docs.python.org/license.html
+from __future__ import annotations
 
 import argparse
 import logging
@@ -315,7 +316,7 @@ class PluginInterface:
         "handleDir",
         # ... etc?
     )
-    hookClass = Hook
+    hookClass: type[Hook] = Hook
 
     def __init__(self):
         self.hooks = {}

nose2/plugins/loader/eggdiscovery.py

@@ -13,8 +13,11 @@
 
 """
 
+from __future__ import annotations
+
 import logging
 import os
+import types
 
 from nose2 import events
 from nose2.plugins.loader import discovery
@@ -23,7 +26,9 @@
 log = logging.getLogger(__name__)
 
 try:
-    import pkg_resources
+    import pkg_resources as _pkg_resources_mod
+
+    pkg_resources: types.ModuleType | None = _pkg_resources_mod
 except ImportError:
     pkg_resources = None
 

nose2/plugins/printhooks.py

@@ -12,11 +12,13 @@
 each call.
 """
 
+from __future__ import annotations
+
 import sys
 
 from nose2 import events
 
-INDENT = []
+INDENT: list[str] = []
 __unittest = True