code: def prepend(exception, message, end=': '):
      
      exception.args = exception.args or ('',)
      exception.args = (message + end + exception.args[0], ) + exception.args[1:]
      return exception
docs: Prepends the first argument (i.e., the exception message) of the a BaseException with the provided message.
      Useful for reraising exceptions with additional information.
  
      :param BaseException exception: the exception to prepend
      :param str message: the message to prepend
      :param str end: the separator to add to the end of the provided message
      :returns: the exception