import logging
import json
import logging.config
import os
from logging.handlers import RotatingFileHandler, TimedRotatingFileHandler
import sys
import colorlog# 基础用法
# """
"""
logging.basicConfig(filemode="a", level=logging.DEBUG,format='%(asctime)s - %(funcName)s - %(levelname)s - %(message)s - %(filename)s',filename="log.txt") ##level 设置日志级别只打印该级别以及以上级别的日志
logger = logging.getLogger(__name__)
console = logging.StreamHandler()#控制终端输出
console.setLevel(logging.WARN)
logger.addHandler(console)
logger.info("Start print log")
logger.debug("Do something")
logger.warning("Something maybe fail.")
logger.info("Finish")""""""可以发现，logging有一个日志处理的主对象，其他处理方式都是通过addHandler添加进去，logging中包含的handler主要有如下几种，
handler名称：位置；作用StreamHandler：logging.StreamHandler；日志输出到流，可以是sys.stderr，sys.stdout或者文件
FileHandler：logging.FileHandler；日志输出到文件
BaseRotatingHandler：logging.handlers.BaseRotatingHandler；基本的日志回滚方式
RotatingHandler：logging.handlers.RotatingHandler；日志回滚方式，支持日志文件最大数量和日志文件回滚
TimeRotatingHandler：logging.handlers.TimeRotatingHandler；日志回滚方式，在一定时间区域内回滚日志文件
SocketHandler：logging.handlers.SocketHandler；远程输出日志到TCP/IP sockets
DatagramHandler：logging.handlers.DatagramHandler；远程输出日志到UDP sockets
SMTPHandler：logging.handlers.SMTPHandler；远程输出日志到邮件地址
SysLogHandler：logging.handlers.SysLogHandler；日志输出到syslog
NTEventLogHandler：logging.handlers.NTEventLogHandler；远程输出日志到Windows NT/2000/XP的事件日志
MemoryHandler：logging.handlers.MemoryHandler；日志输出到内存中的指定buffer
HTTPHandler：logging.handlers.HTTPHandler；通过"GET"或者"POST"远程输出到HTTP服务器"""# """
# logging.basicConfig函数各参数：
# filename：指定日志文件名；
# filemode：和file函数意义相同，指定日志文件的打开模式，'w'或者'a'；
# format：指定输出的格式和内容，format可以输出很多有用的信息，
# 参数：作用
#
# %(levelno)s：打印日志级别的数值
# %(levelname)s：打印日志级别的名称
# %(pathname)s：打印当前执行程序的路径，其实就是sys.argv[0]
# %(filename)s：打印当前执行程序名
# %(funcName)s：打印日志的当前函数
# %(lineno)d：打印日志的当前行号
# %(asctime)s：打印日志的时间
# %(thread)d：打印线程ID
# %(threadName)s：打印线程名称
# %(process)d：打印进程ID
# %(message)s：打印日志信息
# datefmt：指定时间格式，同time.strftime()；
# level：设置日志级别，默认为logging.WARNNING；
# stream：指定将日志的输出流，可以指定输出到sys.stderr，sys.stdout或者文件，默认输出到sys.stderr，当stream和filename同时指定时，stream被忽略；"""#日志信息输出到文件
import logging
logger = logging.getLogger(__name__)
logger.setLevel(level = logging.INFO)
handler = logging.FileHandler("log.txt")
handler.setLevel(logging.WARN)
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
handler.setFormatter(formatter)
logger.addHandler(handler)logger.info("Start print log")
logger.debug("Do something")
logger.warning("Something maybe fail.")
logger.info("Finish")""""""# 日志回滚备份 基于时间和大小
logger = logging.getLogger(__name__)
logger.setLevel(level=logging.INFO)
# 定义一个RotatingFileHandler，最多备份3个日志文件，每个日志文件最大1K
trHandler = TimedRotatingFileHandler("log.txt", when="S", interval=5, backupCount=3)
trHandler.setLevel(logging.INFO)
# rHandler = RotatingFileHandler("log.txt", maxBytes=1 * 1024, backupCount=3)
# rHandler.setLevel(logging.INFO)
formatter = logging.Formatter('time %(asctime)s - filename %(filename)s - level %(levelname)s - message %(message)s - ID %(process)d')
trHandler.setFormatter(formatter)
# rHandler.setFormatter(formatter)console = logging.StreamHandler()
console.setLevel(logging.INFO)
console.setFormatter(formatter)logger.addHandler(trHandler)
# logger.addHandler(rHandler)
logger.addHandler(console)logger.info("Start print log")
logger.debug("Do something")
logger.warning("Something maybe fail.")
logger.info("Finish")"""# 3.1 通过JSON文件配置def setup_logging(default_path="logging.json", default_level=logging.INFO, env_key="LOG_CFG"):path = default_pathvalue = os.getenv(env_key, None)if value:path = valueif os.path.exists(path):with open(path, "r") as f:config = json.load(f)logging.config.dictConfig(config)else:logging.basicConfig(level=default_level)def func():logging.info("start func")logging.info("exec func")logging.info("end func")if __name__ == "__main__":setup_logging(default_path="logging.json")func()
# 通过JSON加载配置文件，然后通过logging.dictConfig配置logging，
logger.json
{"version":1,"disable_existing_loggers":false,"formatters":{"simple":{"format":"%(asctime)s - %(name)s - %(levelname)s - %(message)s"}},"handlers":{"console":{"class":"logging.StreamHandler","level":"DEBUG","formatter":"simple","stream":"ext://sys.stdout"},"info_file_handler":{"class":"logging.handlers.RotatingFileHandler","level":"INFO","formatter":"simple","filename":"info.log","maxBytes":10485760,"backupCount":20,"encoding":"utf8"},"error_file_handler":{"class":"logging.handlers.RotatingFileHandler","level":"ERROR","formatter":"simple","filename":"errors.log","maxBytes":10485760,"backupCount":20,"encoding":"utf8"}},"loggers":{"my_module":{"level":"ERROR","handlers":["info_file_handler"],"propagate":"no"}},"root":{"level":"INFO","handlers":["console","info_file_handler","error_file_handler"]}
}