pip install loguru 

from loguru import logger  
logger.debug("That's it, beautiful and simple logging!")  

# add  
logger.add(sys.stderr, \  
    format="{time} {level} {message}",\  
    filter="my_module",\  
    level="INFO") 

# 日志文件記錄  
logger.add("file_{time}.log")  
# 日志文件轉(zhuǎn)存  
logger.add("file_{time}.log", rotation="500 MB")  
logger.add("file_{time}.log", rotation="12:00")  
logger.add("file_{time}.log", rotation="1 week")  
# 多次時(shí)間之后清理  
logger.add("file_X.log", retention="10 days")  
# 使用zip文件格式保存  
logger.add("file_Y.log", compression="zip") 

logger.info(  
    "If you're using Python {}, prefer {feature} of course!",  
    3.10, feature="f-strings") 

@logger.catch  
def my_function(x, y, z):  
    # An error? It's caught anyway!  
    return 1 / (x + y + z)  
my_function(0, 0, 0) 

logger.add(sys.stdout,  
    colorize=True,  
    format="<green>{time}</green> <level>{message}</level>")  
logger.add('logs/z_{time}.log',  
           level='DEBUG',  
           format='{time:YYYY-MM-DD :mm:ss} - {level} - {file} - {line} - {message}',  
           rotation="10 MB") 

# 異步寫入  
logger.add("some_file.log", enqueue=True)  

logger.add("out.log", backtrace=True, diagnose=True)  
def func(a, b):  
    return a / b  
def nested(c):  
    try:  
        func(5, c)  
    except ZeroDivisionError:  
        logger.exception("What?!")  
nested(0) 

# 序列化為json格式  
logger.add(custom_sink_function, serialize=True)  
# bind方法的用處  
logger.add("file.log", format="{extra[ip]} {extra[user]} {message}")  
context_logger = logger.bind(ip="192.168.2.174", user="someone")  
context_logger.info("Contextualize your logger easily")  
context_logger.bind(user="someone_else").info("Inline binding of extra attribute")  
context_logger.info("Use kwargs to add context during formatting: {user}", user="anybody")  
# 粒度控制  
logger.add("special.log", filter=lambda record: "special" in record["extra"])  
logger.debug("This message is not logged to the file")  
logger.bind(special=True).info("This message, though, is logged to the file!")  
# patch()方法的用處  
logger.add(sys.stderr, format="{extra[utc]} {message}")  
loggerlogger = logger.patch(lambda record: record["extra"].update(utc=datetime.utcnow()))

logger.opt(lazy=True).debug("If sink level <= DEBUG: {x}", x=lambda: expensive_function(2**64))  
# By the way, "opt()" serves many usages  
logger.opt(exception=True).info("Error stacktrace added to the log message (tuple accepted too)")  
logger.opt(colors=True).info("Per message <blue>colors</blue>")  
logger.opt(record=True).info("Display values from the record (eg. {record[thread]})")  
logger.opt(raw=True).info("Bypass sink formatting\n")  
logger.opt(depth=1).info("Use parent stack context (useful within wrapped functions)")  
logger.opt(capture=False).info("Keyword arguments not added to {dest} dict", dest="extra") 

new_level = logger.level("SNAKY", no=38, color="<yellow>", icon="??")  
logger.log("SNAKY", "Here we go!") 

# For scripts  
config = {  
    "handlers": [  
        {"sink": sys.stdout, "format": "{time} - {message}"},  
        {"sink": "file.log", "serialize": True},  
    ],  
    "extra": {"user": "someone"}  
}  
logger.configure(**config)  
# For libraries  
logger.disable("my_library")  
logger.info("No matter added sinks, this message is not displayed")  
logger.enable("my_library")  
logger.info("This message however is propagated to the sinks") 

handler = logging.handlers.SysLogHandler(address=('localhost', 514)) 
logger.add(handler)  
class PropagateHandler(logging.Handler):  
    def emit(self, record):  
        logging.getLogger(record.name).handle(record)  
logger.add(PropagateHandler(), format="{message}")  
class InterceptHandler(logging.Handler):  
    def emit(self, record):  
        # Get corresponding Loguru level if it exists  
        try:  
            level = logger.level(record.levelname).name  
        except ValueError:  
            level = record.levelno  
        # Find caller from where originated the logged message  
        frame, depth = logging.currentframe(), 2  
        while frame.f_code.co_filename == logging.__file__:  
            frameframe = frame.f_back  
            depth += 1  
        logger.opt(depthdepth=depth, exception=record.exc_info).log(level, record.getMessage())  
logging.basicConfig(handlers=[InterceptHandler()], level=0) 

pattern = r"(?P<time>.*) - (?P<level>[0-9]+) - (?P<message>.*)"  # Regex with named groups  
caster_dict = dict(time=dateutil.parser.parse, level=int)        # Transform matching groups  
for groups in logger.parse("file.log", pattern, cast=caster_dict):  
    print("Parsed:", groups) 
    # {"level": 30, "message": "Log example", "time": datetime(2018, 12, 09, 11, 23, 55)}

import notifiers  
params = {  
    "username": "you@gmail.com",  
    "password": "abc123",  
    "to": "dest@gmail.com"  
}  
# Send a single notification  
notifier = notifiers.get_notifier("gmail")  
notifier.notify(message="The application is running!", **params)  
# Be alerted on each error message  
from notifiers.logging import NotificationHandler  
handler = NotificationHandler("gmail", defaults=params)  
logger.add(handler, level="ERROR") 

import logging  
import sys  
from pathlib import Path  
from flask import Flask  
from loguru import logger  
app = Flask(__name__)  
class InterceptHandler(logging.Handler):  
    def emit(self, record):  
        loggerlogger_opt = logger.opt(depth=6, exception=record.exc_info)  
        logger_opt.log(record.levelname, record.getMessage())  
def configure_logging(flask_app: Flask):  
    """配置日志"""  
    path = Path(flask_app.config['LOG_PATH'])  
    if not path.exists():  
        path.mkdir(parents=True)  
    log_name = Path(path, 'sips.log')  
    logging.basicConfig(handlers=[InterceptHandler(level='INFO')], level='INFO')  
    # 配置日志到標(biāo)準(zhǔn)輸出流  
    logger.configure(handlers=[{"sink": sys.stderr, "level": 'INFO'}])  
    # 配置日志到輸出到文件  
    logger.add(log_name, rotation="500 MB", encoding='utf-8', colorize=False, level='INFO') 

def add(self, sink, *,  
    level=_defaults.LOGURU_LEVEL, format=_defaults.LOGURU_FORMAT,  
    filter=_defaults.LOGURU_FILTER, colorize=_defaults.LOGURU_COLORIZE,  
    serialize=_defaults.LOGURU_SERIALIZE, backtrace=_defaults.LOGURU_BACKTRACE,  
    diagnose=_defaults.LOGURU_DIAGNOSE, enqueue=_defaults.LOGURU_ENQUEUE,  
    catch=_defaults.LOGURU_CATCH, **kwargs  
): 

from loguru import logger  
trace = logger.add('runtime.log')  
logger.debug('this is a debug message')  
logger.remove(trace)  
logger.debug('this is another debug message')