Python 日志记录模块的综合指南

import logging
name = 'Rocky'
logging.error(f'{name} raised an error')

Output:
ERROR:root:Rocky raised an error

# 导入日志模块
import logging
# 创建并配置日志记录器
logging.basicConfig(filename="newfile.log",  # 指定日志文件名
                    format='%(asctime)s %(message)s',  # 定义日志信息格式
                    filemode='w')  # 将文件模式设置为 "w"，以便写入。
# 创建日志记录器对象
logger = logging.getLogger()
# 设置日志记录器的阈值为 DEBUG 级别
logger.setLevel(logging.DEBUG)
# 记录不同严重程度的测试信息
logger.debug("A harmless debug message")  # 调试级别信息
logger.info("Just providing some information")  # 信息级消息
logger.warning("This is a warning")  # 警告级别消息
logger.error("Have you attempted to divide by zero?")  # 错误级别信息
logger.critical("The internet connection is down")  # 严重级别信息
Output:
DEBUG:root:A harmless debug message
INFO:root:Just providing some information
WARNING:root:This is a warning
ERROR:root:Have you attempted to divide by zero?
CRITICAL:root:The internet connection is down

file name : temp.conf
[loggers]
keys=root,simpleExample
[handlers]
keys=consoleHandler
[formatters]
keys=simpleFormatter
[logger_root]
level=DEBUG
handlers=consoleHandler
[logger_simpleExample]
level=DEBUG
handlers=consoleHandler
qualname=simpleExample
propagate=0
[handler_consoleHandler]
class=StreamHandler
level=DEBUG
formatter=simpleFormatter
args=(sys.stdout,)
[formatter_simpleFormatter]
format=%(asctime)s - %(name)s - %(levelname)s - %(message)s

import logging
import logging.config
logging.config.fileConfig('temp.conf')
logger = logging.getLogger('simpleExample')
logger.debug('debug message')
logger.info('info message')
logger.warning('warn message')
logger.error('error message')
logger.critical('critical message')
Output:
2023-09-01 13:04:35,581 - simpleExample - DEBUG - debug message
2023-09-01 13:04:35,581 - simpleExample - INFO - info message
2023-09-01 13:04:35,581 - simpleExample - WARNING - warn message
2023-09-01 13:04:35,581 - simpleExample - ERROR - error message
2023-09-01 13:04:35,582 - simpleExample - CRITICAL - critical message

import logging
# 配置日志系统
logging.basicConfig(level=logging.DEBUG,
                    format='%(asctime)s - %(levelname)s - %(message)s')
# 定义对给定值执行操作的函数
def perform_operation(value):
    if value < 0:
        raise ValueError("Invalid value: The value cannot be negative.")
    else:
        logging.info("Operation completed successfully.")
try:
    input_value = int(input("Please input a numerical value: "))
    perform_operation(input_value)
except ValueError as ve:
    logging.exception("An exception occurred: %s", str(ve))
Output:
Please input a numerical value: 
-6
ERROR:root:An exception occurred: Invalid value: The value cannot be negative.
Traceback (most recent call last):
  File "<ipython-input-15-d0b160f9076e>", line 21, in <cell line: 16>
    perform_operation(input_value)
  File "<ipython-input-15-d0b160f9076e>", line 11, in perform_operation
    raise ValueError("Invalid value: The value cannot be negative.")
ValueError: Invalid value: The value cannot be negative.