code: def __init__(self, msg, unhandled):
      super(MissingInMergeArtifactsException, self).__init__(msg)
      self.artifact_names = unhandled
  
imports: import sys
  import traceback
label_desc: Use image node_id 1 to create a new MissingInMergeArtifactsException object from inherited base classes: MetaflowException with example: obj = MissingInMergeArtifactsException(msg, unhandled)