Python 函数——logging.basicConfig

import logging

logging.basicConfig(level=logging.DEBUG,
format='%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s',
datefmt='%a, %d %b %Y %H:%M:%S',
filename='myapp.log',
filemode='w')

logging.debug('This is debug message')
logging.info('This is info message')
logging.warning('This is warning message')

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'a'
format: 指定输出的格式和内容，format可以输出很多有用信息，如上例所示:
%(levelno)s: 打印日志级别的数值
%(levelname)s: 打印日志级别名称
%(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.WARNING
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

例子：

logging.basicConfig(level=logging.DEBUG,
format='%(asctime)s %(thread)d %(threadName)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s',
datefmt='%a, %d %b %Y %H:%M:%S',
filename=logfile_path,
filemode='w')结果：
Sat, 04 Feb 2017 13:53:15 4296 MainThread ScriptRecorder.py[line:38] DEBUG Start the application.
Sat, 04 Feb 2017 13:53:15 4296 MainThread ScriptRecorder.py[line:25] DEBUG Begin class constructor.
Sat, 04 Feb 2017 13:53:15 4296 MainThread ScriptRecorder.py[line:29] DEBUG Show the init window.
Sat, 04 Feb 2017 13:53:15 4296 MainThread init_window.py[line:18] DEBUG Init window constructor.
Sat, 04 Feb 2017 13:53:15 4296 MainThread init_window.py[line:62] DEBUG Get devices count.
Sat, 04 Feb 2017 13:53:15 4296 MainThread init_window.py[line:55] DEBUG Get devices list.