<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def group(self, indent: int = DEFAULT_INDENT, add_line: bool = True) -> _TextGroup: """ Returns a context manager which adds an indentation before each line. :param indent: Number of spaces to print. :param add_line: If True, a new line will be printed after the group. :return: A TextGroup context manager. """

        return _TextGroup(self, indent, add_line)