python logging 使用记录:设置INFO级别不生效，格式化，输出到文件

import logging

log = logging.getLogger()
log.setLevel(logging.INFO)
log.info("INFO INFO INFO")
log.warning("这是WARN")

# 输出
D:\workspace\investment\venv\Scripts\python.exe D:/workspace/python-common/basic/logging_test.py
这是WARN

import logging

if __name__ == '__main__':
    log = logging.getLogger()
    handler = logging.StreamHandler()
    log.addHandler(handler)
    log.setLevel(logging.INFO)
    log.info("这是INFO-1")

import logging

if __name__ == '__main__':
    log = logging.getLogger()
    handler = logging.StreamHandler()  # StreamHandler是输出到控制台
    log.addHandler(handler)
    log.setLevel(logging.INFO)
    log.info("这是INFO-1")

    logger = logging.getLogger()
    logger.info("这是INFO-2")

import logging

if __name__ == '__main__':
    log = logging.getLogger("console-logger")
    handler = logging.StreamHandler()
    log.addHandler(handler)
    log.setLevel(logging.INFO)
    log.info("这是INFO-1")

    log2 = logging.getLogger("file-logger")
    file_handler = logging.FileHandler("E:/test.log")
    log2.addHandler(file_handler)
    log2.setLevel(logging.WARNING)
    log2.info("这个不会被记录")
    log2.warning("警告警告~~~~")

import logging


def print_name(logger, name):
    logger.info("name={}".format(name))


if __name__ == '__main__':
    log = logging.getLogger("console-logger")
    handler = logging.StreamHandler()
    handler.setFormatter(logging.Formatter("%(asctime)s %(filename)s %(funcName)s[line:%(lineno)d]%(levelname)s - %(message)s"))
    log.addHandler(handler)
    log.setLevel(logging.INFO)
    log.info("这是INFO-1")
    print_name(log, "happyjava")
复制代码

#     format参数中可能用到的格式化串
#     %(name)s Logger的名字
#     %(levelno)s 数字形式的日志级别
#     %(levelname)s 文本形式的日志级别
#     %(pathname)s 调用日志输出函数的模块的完整路径名，可能没有
#     %(filename)s 调用日志输出函数的模块的文件名
#     %(module)s 调用日志输出函数的模块名
#     %(funcName)s 调用日志输出函数的函数名
#     %(lineno)d 调用日志输出函数的语句所在的代码行
#     %(created)f 当前时间，用UNIX标准的表示时间的浮 点数表示
#     %(relativeCreated)d 输出日志信息时的，自Logger创建以 来的毫秒数
#     %(asctime)s 字符串形式的当前时间。默认格式是 “2003-07-08 16:49:45,896”。逗号后面的是毫秒
#     %(thread)d 线程ID。可能没有
#     %(threadName)s 线程名。可能没有
#     %(process)d 进程ID。可能没有
#     %(message)s用户输出的消息