add IPython.utils.log.get_logger

simple utility for getting the global logger

- from the Application instance, if running
- Python root logger, if not

IPython/utils/log.py

@@ -0,0 +1,25 b''
+"""Grab the global logger instance."""
+
+# Copyright (c) IPython Development Team.
+# Distributed under the terms of the Modified BSD License.
+
+import logging
+
+_logger = None
+
+def get_logger():
+    """Grab the global logger instance.
+    
+    If a global IPython Application is instantiated, grab its logger.
+    Otherwise, grab the root logger.
+    """
+    global _logger
+    
+    if _logger is None:
+        from IPython.config import Application
+        if Application.initialized():
+            _logger = Application.instance().log
+        else:
+            logging.basicConfig()
+            _logger = logging.getLogger()
+    return _logger