environment/lib/python2.7/site-packages/IPython/frontend/html/notebook/notebookmanager.py
def delete_notebook_id(self, notebook_id):
        """Delete a notebook's id only. This doesn't delete the actual notebook."""
        name = self.mapping[notebook_id]
        del self.mapping[notebook_id]
        del self.rev_mapping[name]
def delete_notebook_id(self, notebook_id):
        """Delete a notebook's id only. This doesn't delete the actual notebook."""
        name = self.mapping[notebook_id]
        del self.mapping[notebook_id]
        del self.rev_mapping[name]
Delete a notebook's id only. This doesn't delete the actual notebook.