Backward compat

Author: martinRenou

python/ipywidgets/ipywidgets/__init__.py

@@ -23,7 +23,13 @@
 import os
 
 from traitlets import link, dlink
-from comm import get_comm_manager
+try:
+    from comm import get_comm_manager
+except ImportError:
+    def get_comm_manager():
+        from IPython import get_ipython
+
+        return get_ipython().kernel.comm_manager
 
 from .widgets import *
 

python/ipywidgets/ipywidgets/widgets/widget.py

@@ -10,7 +10,13 @@
 from contextlib import contextmanager
 from collections.abc import Iterable
 from IPython import get_ipython
-from comm import create_comm
+try:
+    from comm import create_comm
+except ImportError:
+    from ipykernel.comm import Comm
+
+    def create_comm(**kwargs):
+        return Comm(**kwargs)
 from traitlets import (
     Any, HasTraits, Unicode, Dict, Instance, List, Int, Set, Bytes, observe, default, Container,
     Undefined)