fix name scope error in remove_descriptor (plus some ws/linelen fixes)

eventlet/hubs/pyevent.py

@@ -43,7 +43,9 @@ class Hub(BaseHub):
         event.init()
 
         self.signal_exc_info = None
-        self.signal(2, lambda signalnum, frame: self.greenlet.parent.throw(KeyboardInterrupt))
+        self.signal(
+            2,
+            lambda signalnum, frame: self.greenlet.parent.throw(KeyboardInterrupt))
         self.events_to_add = []
 
     def dispatch(self):
@@ -76,7 +78,8 @@ class Hub(BaseHub):
                 raise
             except:
                 if self.signal_exc_info is not None:
-                    self.schedule_call_global(0, greenlet.getcurrent().parent.throw, *self.signal_exc_info)
+                    self.schedule_call_global(
+                        0, greenlet.getcurrent().parent.throw, *self.signal_exc_info)
                     self.signal_exc_info = None
                 else:
                     self.squelch_timer_exception(None, sys.exc_info())
@@ -128,7 +131,7 @@ class Hub(BaseHub):
             for listener in l_list:
                 try:
                     listener.cb.delete()
-                except SYSTEM_EXCEPTIONS:
+                except self.SYSTEM_EXCEPTIONS:
                     raise
                 except:
                     traceback.print_exc()
@@ -169,4 +172,3 @@ def _scheduled_call_local(event_impl, handle, evtype, arg):
             cb(*args, **kwargs)
     finally:
         event_impl.delete()
-