code: def is_background_knowledge(stmt):
      '''Return True if Statement is only supported by background knowledge.'''
      any_background = False
      # Iterate over all evidence for the statement
      for ev in stmt.evidence:
          epi = ev.epistemics
          if epi is not None:
              sec = epi.get('section_type')
              # If there is at least one evidence not from a 
              # background section then we consider this to be
              # a non-background knowledge finding.
              if sec is not None and sec not in background_secs:
                  return False
              # If there is at least one evidence that is explicitly
              # from a background section then we keep track of that.
              elif sec in background_secs:
                  any_background = True
      # If there is any explicit evidence for this statement being
      # background info (and no evidence otherwise) then we return
      # True, otherwise (for instnace of there is no section info at all)
      # we return False.
      return any_backgrounf is_background_knowledge(stmt):
      '''Return True if Statement is only supported by background knowledge.'''
      any_background = False
      # Iterate over all evidence for the statement
      for ev in stmt.evidence:
          epi = ev.epistemics
          if epi is not None:
              sec = epi.get('section_type')
              # If there is at least one evidence not from a 
              # background section then we consider this to be
              # a non-background knowledge finding.
              if sec is not None and sec not in background_secs:
                  return False
              # If there is at least one evidence that is explicitly
              # from a background section then we keep track of that.
              elif sec in background_secs:
                  any_background = True
      # If there is any explicit evidence for this statement being
      # background info (and no evidence otherwise) then we return
      # True, otherwise (for instnace of there is no section info at all)
      # we return False.
      return any_background
docs: Return True if Statement is only supported by background knowledge.