python打印log调试信息的方法

打印错误跟踪的方法：

方法1.打印到屏幕

try:

    i = 0

    mydbhandler.executemany(sql, tmp)

    logging.info("[total cost time:" + str((time.time() - start)*1000) + "ms]")

    print "total cost time:", (time.time() - start)*1000, "ms"

except:

    etype, evalue, tracebackObj = sys.exc_info()[:3]

    print "Type: " , etype

    print "Value: " , evalue

    traceback.print_tb(tracebackObj)

方法2.打印到文件

import logging

LOG_FILENAME = '/tmp/logging_example.out'

logging.basicConfig(filename=LOG_FILENAME,level=logging.DEBUG,)

#log 打印格式配置

#logging.basicConfig(filename=LOG_FILENAME,level=logging.DEBUG,format='[%(asctime)s] %(levelname)s:%(filename)s:%(funcName)s: %(message)s',)

logging.debug('This message should go to the log file')

try:

    i = 0

    mydbhandler.executemany(sql, tmp)

    logging.info("[total cost time:" + str((time.time() - start)*1000) + "ms]")

    print "total cost time:", (time.time() - start)*1000, "ms"

except:

    etype, evalue, tracebackObj = sys.exc_info()[:3]

    print "Type: " , etype

    print "Value: " , evalue

    logging.exception('Got exception on main handler')

    raise

注意：logging是可以配置打印格式的

参考:
http://stackoverflow.com/questions/1508467/how-to-log-my-traceback-error http://groups.google.com/group/python-tornado/browse_thread/thread/acf41c6e03045a4c#