web/lib/utils.py: a set of various utils for project

And firstly write get_logger() function. It provides common mechanism
for creating logger instances inside scripts.

web/lib/utils.py

@@ -0,0 +1,26 @@
+import logging
+
+def get_logger(filename=None, log_level='debug'):
+	""" Prepare logger instance for our scripts """
+
+	LEVELS = {
+		'debug': logging.DEBUG,
+		'info': logging.INFO,
+		'warning': logging.WARNING,
+		'error': logging.ERROR,
+		'critical': logging.CRITICAL
+	}
+	level = LEVELS.get(log_level, logging.NOTSET)
+	format = '%(asctime)s %(module)s:%(lineno)d[%(process)d] %(levelname)s: %(message)s'
+	formatter = logging.Formatter(format)
+	logger = logging.getLogger(__name__)
+	logger.setLevel(level)
+	if filename:
+		handler = logging.FileHandler(filename)
+	else:
+		handler = logging.StreamHandler()
+	handler.setFormatter(formatter)
+	logger.addHandler(handler)
+
+	return logger
+