Remove ipykernel.codeutil deprecated since IPykernel 4.3.1 (Feb 2016)

Author: Carreau

ipykernel/codeutil.py

@@ -18,12 +18,7 @@
 from ipython_genutils.py3compat import buffer_to_bytes
 
 # This registers a hook when it's imported
-try:
-    # available since ipyparallel 5.1.1
-    from ipyparallel.serialize import codeutil
-except ImportError:
-    # Deprecated since ipykernel 4.3.1
-    from ipykernel import codeutil
+from ipyparallel.serialize import codeutil
 
 from traitlets.log import get_logger
 

ipykernel/pickleutil.py

@@ -84,12 +84,13 @@ def run(self):
         'appnope;platform_system=="Darwin"',
     ],
     extras_require={
-        'test': [
-            'pytest !=5.3.4',
-            'pytest-cov',
-            'flaky',
-            'nose',  # nose because there are still a few nose.tools imports hanging around
-            'jedi<=0.17.2'
+        "test": [
+            "pytest !=5.3.4",
+            "pytest-cov",
+            "flaky",
+            "nose",  # nose because there are still a few nose.tools imports hanging around
+            "jedi<=0.17.2",
+            "ipyparallel",
         ],
     },
     classifiers=[