Добавить новый цветной журнал уровня

Это требует добавления нескольких строк, включая этот блок (с добавлением еще одной строки для установки целочисленного значения для logging.SUCCESS:

def success(msg, *args, **kwargs):
    if logging.getLogger().isEnabledFor(70):
        logging.log(70, msg)

logging.addLevelName(70, "SUCCESS")
logging.SUCCESS = 70   # similar to logging.INFO -> 20
logging.success = success
logging.Logger.success = success

Я указал строки, которые были добавлены/изменены здесь. Чтобы добавить дополнительные уровни, достаточно определить те же структуры для новых и изменить цикл for и функции set_colour().

import logging
import re
import time
import sys

def set_colour(level):
    """
    Sets colour of text for the level name in
    logging statements using a dispatcher.
    """
    escaped = "[\033[1;%sm%s\033[1;0m]"
    return {
        'INFO': lambda: logging.addLevelName(logging.INFO, escaped % ('94', level)),
        'WARNING': lambda: logging.addLevelName(logging.ERROR, escaped % ('93', level)),
        'ERROR': lambda: logging.addLevelName(logging.WARNING, escaped % ('91', level)),
        'SUCCESS': lambda: logging.addLevelName(logging.SUCCESS, escaped % ('31', level))   # new
    }.get(level, lambda: None)()


class NoColorFormatter(logging.Formatter):
    """
    Log formatter that strips terminal colour
    escape codes from the log message.
    """

    # Regex for ANSI colour codes
    ANSI_RE = re.compile(r"\x1b\[[0-9;]*m")

    def format(self, record):
        """Return logger message with terminal escapes removed."""
        return "%s %s %s" % (
            time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()),
            re.sub(self.ANSI_RE, "", record.levelname),
            record.msg,
        )

def success(msg, *args, **kwargs):   # new
    if logging.getLogger().isEnabledFor(70):   # new
        logging.log(70, msg)   # new

# Create logger
logger = logging.getLogger(__package__)

# Create formatters
logformatter = NoColorFormatter()
colorformatter = logging.Formatter("%(asctime)s %(levelname)s %(message)s")

# Create new level
logging.SUCCESS = 70   # new
logging.success = success   # new
logging.Logger.success = success   # new

# Set logging colours
for level in 'INFO', 'ERROR', 'WARNING', 'SUCCESS':   # modified
    set_colour(level)

# Set logging level
logger.setLevel(logging.INFO)

# Set log handlers
loghandler = logging.FileHandler("log.txt", mode="w", encoding="utf8")
streamhandler = logging.StreamHandler(sys.stdout)

# Set log formatters
loghandler.setFormatter(logformatter)
streamhandler.setFormatter(colorformatter)

# Attach log handlers to logger
logger.addHandler(loghandler)
logger.addHandler(streamhandler)

# Example logging statements
logging.info("This is just an information for you")
logging.warning("This is just an information for you")
logging.error("This is just an information for you")
logging.success("This is just an information for you")