Merge pull request #371 from jupyter/auto-backport-of-pr-346

Backport PR #346 on branch 5.x
jupyter · Apr 12, 2018 · d4c7e09 · d4c7e09
2 parents f575003 + 1d278ca
commit d4c7e09
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/jupyter_client/launcher.py b/jupyter_client/launcher.py
@@ -111,6 +111,10 @@ def launch_kernel(cmd, stdin=None, stdout=None, stderr=None, env=None,
                                      DUPLICATE_SAME_ACCESS)
             env['JPY_PARENT_PID'] = str(int(handle))
 
+        # Prevent creating new console window on pythonw
+        if redirect_out:
+            kwargs['creationflags'] = kwargs.setdefault('creationflags', 0) | 0x08000000 # CREATE_NO_WINDOW
+
     else:
         # Create a new session.
         # This makes it easier to interrupt the kernel,