only enter eventloop when there is one

rather than calling enter_eventloop again when the eventloop is disabled (eventloop = None)
ipython · Jan 16, 2018 · 1bb6a1f · 1bb6a1f
1 parent dc54a6e
commit 1bb6a1f
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/ipykernel/kernelbase.py b/ipykernel/kernelbase.py
@@ -50,7 +50,8 @@ class Kernel(SingletonConfigurable):
  def _update_eventloop(self, change):
  """schedule call to eventloop from IOLoop"""
  loop = ioloop.IOLoop.current()
- loop.add_callback(self.enter_eventloop)
+ if change.new is not None:
+ loop.add_callback(self.enter_eventloop)
 
  session = Instance(Session, allow_none=True)
  profile_dir = Instance('IPython.core.profiledir.ProfileDir', allow_none=True)