code: def acp_users_import():
      
      if not current_user.is_admin:
          return error("Not authorized to edit users.", 401)
      if not db:
          return error('The ACP is not available in single-user mode.', 500)
  
      form = UserImportForm()
      if not form.validate():
          return error("Bad Request", 400)
      fh = request.files['tsv'].stream
      tsv = fh.read()
      return tsv
docs: Import users from a TSV file.