Fix bug with duplicate hist_file

jupyter · May 5, 2021 · cd17eb3 · cd17eb3
1 parent 7104e19
commit cd17eb3
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/nbgrader/preprocessors/execute.py b/nbgrader/preprocessors/execute.py
@@ -38,6 +38,11 @@ def preprocess(self,
                    resources: ResourcesDict,
                    retries: Optional[Any] = None
                    ) -> Tuple[NotebookNode, ResourcesDict]:
+        # This gets added in by the parent execute preprocessor, so if it's already in our
+        # extra arguments we need to delete it or traitlets will be unhappy.
+        if '--HistoryManager.hist_file=:memory:' in self.extra_arguments:
+            self.extra_arguments.remove('--HistoryManager.hist_file=:memory:')
+
         if retries is None:
             retries = self.execute_retries