python logging ensure a handler is added only once

Question

I have a piece of code that is initializing a logger as below.

logger = logging.getLogger()
hdlr = logging.FileHandler(\'logfile.log\')
formatter = logging.         


        

Answer 1

Try checking if logger is already set. For example, if this code is inside a function:

logger = None
def init_logger():
    global logger
    if logger is not None:
        #logger has already been initialized
        return
    logger = logging.getLogger()
    hdlr = logging.FileHandler('logfile.log')
    formatter = logging.Formatter('%(asctime)s %(levelname)s %(message)s')
    hdlr.setFormatter(formatter)
    logger.addHandler(hdlr) 
    logger.setLevel(logging.DEBUG)