python 日志打印模块，输出时间、文件名、行号等信息
通过logging模块来控制日志的输出，相比print直接格式化输出，更加的方便；可以添加更多的日志信息，比如时间、行号、文件信息统一输出；可以通过 setLevel 来统一控制日志的开启与关闭。
下面是参考代码：
#!/usr/bin/env python
# -*-coding:UTF-8-*-
import logging
logging.basicConfig(format='%(asctime)s,%(msecs)d %(levelname)-8s [%(filename)s:%(lineno)d] %(message)s',
datefmt='%d-%m-%Y:%H:%M:%S')
logging.getLogger().setLevel(logging.DEBUG)
logger = logging.getLogger()
logger.debug("This is a debug log")
logger.info("This is an info log")
logger.critical("This is critical")
logger.error("An error occurred\n")
输出结果：
29-02-2020:12:41:17,935 DEBUG [log.py:11] This is a debug log
29-02-2020:12:41:17,935 INFO [log.py:12] This is an info log
29-02-2020:12:41:17,935 CRITICAL [log.py:13] This is critical
29-02-2020:12:41:17,935 ERROR [log.py:14] An error occurred
如果在项目中需要设置多个不同的日志输出器，可以参考下面的代码：
#!/usr/bin/env python
# -*-coding:UTF-8-*-
import logging
# 设置输出格式
logging.basicConfig(format='%(asctime)s,%(msecs)d %(levelname)-8s [%(filename)s:%(lineno)d] %(message)s',
datefmt='%d-%m-%Y:%H:%M:%S')
# 设置日志打印级别
logging.getLogger("test").setLevel(logging.DEBUG)
# 设置日志输出器的名字，可以在项目中配置多个不同的日志输出器
logger = logging.getLogger("test")
logging.getLogger("info").setLevel(logging.INFO)
logger2 = logging.getLogger("info")
logger.debug("This is a debug log")
logger.info("This is an info log")
logger.critical("This is critical")
logger.error("An error occurred\n")
logger2.debug("This is a debug log")
logger2.info("This is an info log")
logger2.critical("This is critical")
logger2.error("An error occurred")
输出结果：
29-02-2020:12:36:30,272 DEBUG [log.py:17] This is a debug log
29-02-2020:12:36:30,272 INFO [log.py:18] This is an info log
29-02-2020:12:36:30,272 CRITICAL [log.py:19] This is critical
29-02-2020:12:36:30,272 ERROR [log.py:20] An error occurred
29-02-2020:12:36:30,273 INFO [log.py:23] This is an info log
29-02-2020:12:36:30,273 CRITICAL [log.py:24] This is critical
29-02-2020:12:36:30,273 ERROR [log.py:25] An error occurred
