I am struggling with python logging library. I want a custom logger with 2 handlers (one stream handler and one file handler) and one of them with a customizable log level. I can obtain what I want if I create everything in my main script, but everything fails if I create the logger as a class, in a separate module. I have the logger class in a custom module, let's say logUtils.py, as follow #imports... class ColoredFormatter(logging.Formatter): #formatter definition class MyLogger(logging.Logger): def __init__(self, name): logging.Logger.__init__(self, name, logging.DEBUG) color_formatter = ColoredFormatter() # this handler should be always at lowest level fh = logging.FileHandler('test.log') fh.setLevel(logging.DEBUG) # this handler is at INFO level by default but can change (see next) ch = logging.StreamHandler() ch.setLevel(logging.INFO) # add formatter to the handlers fh.setFormatter(color_formatter) ch.setFormatter(color_formatter) # add the handlers to logger self.addHandler(fh) self.addHandler(ch) return and in my main script I have something like logging import argparse import logUtils parser = argparse.ArgumentParser(description="bla bla") parser.add_argument("-v", dest='v', action='store_true', default=False, help="Verbose mode for debugging") args = parser.parse_args() logging.setLoggerClass(logUtils.MyLogger) logger = logging.getLogger('fancy_name') if args.v: logger.setLevel(logging.DEBUG) #this is the line! Here I want to change the level of just the StreamHandler The last line is the problematic one: it's changing the top logging level! Suggestions? Continue reading...
