Fix some noqa markers.

Author: ionelmc

src/lazy_object_proxy/compat.py

@@ -6,7 +6,7 @@
 if PY3:
     string_types = str, bytes
 else:
-    string_types = basestring,
+    string_types = basestring,  # noqa: F821
 
 
 def with_metaclass(meta, *bases):

src/lazy_object_proxy/slots.py

@@ -116,8 +116,8 @@ def __name__(self, value):
     def __class__(self):
         return self.__wrapped__.__class__
 
-    @__class__.setter  # noqa
-    def __class__(self, value):
+    @__class__.setter
+    def __class__(self, value):  # noqa: F811
         self.__wrapped__.__class__ = value
 
     @property