owo_formatter.py

import logging


class OwOFormatter(logging.Formatter):

    def __init__(self):
        super().__init__(fmt="%(levelno)d: %(msg)s", datefmt=None, style='%')
        self.info_fmt = "[^w^] %(msg)s"
        self.err_fmt  = "[UwU] %(msg)s"
        self.warn_fmt = "[OwO] %(msg)s"
        self.dbg_fmt  = "[-_-] %(msg)s"
    
    def format(self, record):
        format_orig = self._style._fmt

        if record.levelno == logging.DEBUG:
            self._style._fmt = self.dbg_fmt
        elif record.levelno == logging.INFO:
            self._style._fmt = self.info_fmt
        elif record.levelno == logging.ERROR:
            self._style._fmt = self.err_fmt
        elif record.levelno == logging.WARN:
            self._style._fmt = self.warn_fmt

        result = logging.Formatter.format(self, record)
        self._style._fmt = format_orig
        return result


hdlr = logging.StreamHandler()
hdlr.setFormatter(OwOFormatter())

log = logging.getLogger(__name__)
log.addHandler(hdlr)
log.setLevel(logging.DEBUG)


log.info('Information')
log.debug('Debug message')
log.warning('Warning message')
log.error('Error message')

# [^w^] Information
# [-_-] Debug message
# [OwO] Warning message
# [UwU] Error message