added several new files

logger.py

@@ -0,0 +1,33 @@
+import logging
+from logging import Logger
+import os
+import sys
+
+
+def getLogger(name: str = 'root', loglevel: str = 'INFO') -> Logger:
+  logger = logging.getLogger(name)
+
+  # if logger 'name' already exists, return it to avoid logging duplicate
+  # messages by attaching multiple handlers of the same type
+  if logger.handlers:
+    return logger
+  # if logger 'name' does not already exist, create it and attach handlers
+  else:
+    # set logLevel to loglevel or to INFO if requested level is incorrect
+    loglevel = getattr(logging, loglevel.upper(), logging.INFO)
+    logger.setLevel(loglevel)
+    if loglevel == logging.DEBUG:
+      fmt = '%(asctime)s %(levelname)-8s %(message)s (%(filename)s)'
+    else:
+      fmt = '%(asctime)s %(levelname)-8s %(message)s'
+    fmt_date = '%Y-%m-%dT%T'
+    formatter = logging.Formatter(fmt, fmt_date)
+    handler = logging.StreamHandler()
+    handler.setFormatter(formatter)
+    logger.addHandler(handler)
+
+    if logger.name == 'root':
+      logger.warning('Running: %s %s',
+                     os.path.basename(sys.argv[0]),
+                     ' '.join(sys.argv[1:]))
+    return logger