Merge pull request #495 from davidbrochart/revert_pr494

Revert #494

qtconsole/manager.py

@@ -6,7 +6,6 @@
 # Local imports
 from traitlets import Bool, DottedObjectName
 
-import jupyter_client
 from jupyter_client import KernelManager
 from jupyter_client.restarter import KernelRestarter
 
@@ -28,25 +27,6 @@ def poll(self):
         super().poll()
 
 
-def _post_start_kernel():
-    # KernelManager.post_start_kernel is async in jupyter_client>=7.0
-    if int(jupyter_client.__version__.split(".")[0]) >= 7:
-        async def post_start_kernel(self, **kw):
-            """Kernel restarted."""
-            await super(QtKernelManager, self).post_start_kernel(**kw)
-            if self._is_restarting:
-                self.kernel_restarted.emit()
-                self._is_restarting = False
-    else:
-        def post_start_kernel(self, **kw):
-            """Kernel restarted."""
-            super(QtKernelManager, self).post_start_kernel(**kw)
-            if self._is_restarting:
-                self.kernel_restarted.emit()
-                self._is_restarting = False
-    return post_start_kernel
-
-
 class QtKernelManager(KernelManager, QtKernelManagerMixin):
     """A KernelManager with Qt signals for restart"""
 
@@ -75,7 +55,12 @@ def stop_restarter(self):
             if self._restarter is not None:
                 self._restarter.stop()
 
-    post_start_kernel = _post_start_kernel()
+    def post_start_kernel(self, **kw):
+        """Kernel restarted."""
+        super().post_start_kernel(**kw)
+        if self._is_restarting:
+            self.kernel_restarted.emit()
+            self._is_restarting = False
 
     def _handle_kernel_restarting(self):
         """Kernel has died, and will be restarted."""