docs: def get_robot_variables():
      """Return list of Robot Framework -compatible cli-variables parsed
      from ROBOT_-prefixed environment variable
  
      """
      prefix = 'ROBOT_'
      variables = []
  
      def safe_str(s):
          if isinstance(s, six.text_type):
              return s
          else:
              return six.text_type(s, 'utf-8', 'ignore')
      for key in os.environ:
          if key.startswith(prefix) and len(key) > len(prefix):
              variables.append(safe_str(
                  '%s:%s' % (key[len(prefix):], os.environ[key]),
              ))
      return variables