记录处理程序：我如何确保我不做两个？

Question

编辑：我结束了回答我的问题的牛肉，以便我可以有一个工作日志模块。不过，我仍然有一个相关的问题。请参阅下面的答案。

我试图通过始终记录到任何我所在的操作系统的临时目录来实现日志记录。为此，我编写了以下函数。

import logging, tempfile, os, sys 

def getlog(logname, filename = 'python.log', directory = None): 
    '''returns a logger with logname that will print to filename and directoryname.''' 
    if directory == None: 
     fd, fname = tempfile.mkstemp() 
     directory = os.path.dirname(fname) 

    fullpath = directory + '/' + filename 

    mylog = logging.getLogger(logname) 
    hdlr = logging.FileHandler(fullpath) 

    formatter = logging.Formatter('L:%(name)s M:%(module)s T:%(asctime)s > %(levelname)s: %(message)s') 
    hdlr.setFormatter(formatter) 
    mylog.addHandler(hdlr) 
    mylog.setLevel(logging.INFO) 
    mylog.info('NEW LOGGER STARTED') 
    return mylog 

if __name__ == '__main__': 
    log = getlog('testing') 
    log.info('working?') 
    log.info('yes, seems to be working') 

    log2 = getlog('testing') 
    log2.info('still working?') 

这里是输出：

L:testing M:easy_log T:2011-04-11 15:30:14,315 > INFO: NEW LOGGER STARTED 
L:testing M:easy_log T:2011-04-11 15:30:14,316 > INFO: working? 
L:testing M:easy_log T:2011-04-11 15:30:14,316 > INFO: yes, seems to be working 
L:testing M:easy_log T:2011-04-11 15:30:14,316 > INFO: NEW LOGGER STARTED 
L:testing M:easy_log T:2011-04-11 15:30:14,316 > INFO: NEW LOGGER STARTED 
L:testing M:easy_log T:2011-04-11 15:30:14,316 > INFO: still working? 
L:testing M:easy_log T:2011-04-11 15:30:14,316 > INFO: still working? 

正如你可以看到，现在是双输出。但是，日志记录模块相当混乱，我不知道如何查看日志是否已被实例化，或者日志对象是否具有处理程序。一些帮助将不胜感激。

编辑：为了增加一点细节，我打算在几个模块中调用它，本质上是试图替换“logging.getLogger”调用。

Answer 1

我最终回答了我自己的问题。这里是代码

global IS_SETUP 
IS_SETUP = False 
def setuplogger(filename = 'python.log', directory = None, format = 'L:%(name)s M:%(module)s T:%(asctime)s > %(levelname)s: %(message)s'): 
    global IS_SETUP 
    if directory == None: 
     fd, fname = tempfile.mkstemp() 
     directory = os.path.dirname(fname) 

    logging.basicConfig(filename = directory + '/' + filename, format = format) 
    IS_SETUP = True 

def getlog(logname, level = logging.INFO): 
    '''returns a logger with logname that will print to filename and directoryname.''' 
    if IS_SETUP == False: 
     setuplogger() 

    mylog = logging.getLogger(logname) 

    mylog.setLevel(level) 
    mylog.info('NEW LOGGER STARTED') 
    return mylog 

这可以避免双重配置。而且，即使被称为多次，显然基本配置也可以工作。

如果有人知道如何检查日志对象上的处理程序，我仍然想知道。这似乎绝对不可能。