@classmethod<EOL><INDENT>def set_level(cls, level):<DEDENT>
level = (<EOL>level<EOL>if not is_str(level)<EOL>else int(LOGGING_LEVELS.get(level.upper(), level))<EOL>)<EOL>for handler in root.handlers:<EOL><INDENT>handler.setLevel(level)<EOL><DEDENT>root.setLevel(level)<EOL>
:raises: ValueError