Python：爲logging加點顏色

代碼原理很簡單，在需要加顏色的地方加上控制顏色顯示的語義即可。

第三方模塊

coloredlogs

# Create a logger object.
import logging
logger = logging.getLogger('your-module')

# Initialize coloredlogs.
import coloredlogs
coloredlogs.install(level='DEBUG')

# Some examples.
logger.debug("this is a debugging message")
logger.info("this is an informational message")
logger.warn("this is a warning message")
logger.error("this is an error message")
logger.critical("this is a critical message")

效果圖

純代碼實現

import logging



BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE = range(8)

#The background is set with 40 plus the number of the color, and the foreground with 30

#These are the sequences need to get colored ouput
RESET_SEQ = "\033[0m"
COLOR_SEQ = "\033[1;%dm"
BOLD_SEQ = "\033[1m"

def formatter_message(message, use_color = True):
    if use_color:
        message = message.replace("$RESET", RESET_SEQ).replace("$BOLD", BOLD_SEQ)
    else:
        message = message.replace("$RESET", "").replace("$BOLD", "")
    return message

COLORS = {
    'WARNING': YELLOW,
    'INFO': WHITE,
    'DEBUG': BLUE,
    'CRITICAL': YELLOW,
    'ERROR': RED
}

class ColoredFormatter(logging.Formatter):
    def __init__(self, msg, use_color = True):
        logging.Formatter.__init__(self, msg)
        self.use_color = use_color

    def format(self, record):
        levelname = record.levelname
        if self.use_color and levelname in COLORS:
            levelname_color = COLOR_SEQ % (30 + COLORS[levelname]) + levelname + RESET_SEQ
            record.levelname = levelname_color
        return logging.Formatter.format(self, record)



# Custom logger class with multiple destinations
class ColoredLogger(logging.Logger):
    FORMAT = "[$BOLD%(name)-20s$RESET][%(levelname)-18s]  %(message)s ($BOLD%(filename)s$RESET:%(lineno)d)"
    COLOR_FORMAT = formatter_message(FORMAT, True)
    def __init__(self, name):
        logging.Logger.__init__(self, name, logging.DEBUG)                

        color_formatter = ColoredFormatter(self.COLOR_FORMAT)

        console = logging.StreamHandler()
        console.setFormatter(color_formatter)

        self.addHandler(console)
        return

# 

logging.setLoggerClass(ColoredLogger)
color_log = logging.getLogger(__name__)
color_log.setLevel(logging.DEBUG)

color_log.debug("test")
color_log.info("test")
color_log.warning("test")
color_log.error("test")
color_log.critical("test")

效果圖

日誌等級怎麼用

日誌等級	何時使用
DEBUG	詳細信息，調試問題用。
INFO	確認程序的工作符合預期。
WARNING	指出一個無法預料的事件發生，或者一個即將發生的錯誤，如空間不足，軟件能繼續工作。
ERROR	因爲一些嚴重的問題，導致軟件的有些功能無法正常工作
CRITICAL	一個嚴重的錯誤，指明程序可能無法繼續運行

原帖：

How can I color Python logging output?

參考：

• https://docs.python.org/2/library/logging.html