style(init): Only log exceptions when python version is 3 or higher

Author: chriswmackey

honeybee/__init__.py

@@ -1,6 +1,8 @@
 """Honeybee core library."""
 import importlib
 import pkgutil
+import sys
+
 from honeybee.logutil import get_logger
 
 
@@ -15,6 +17,7 @@
     try:
         extensions[name] = importlib.import_module(name)
     except Exception:
-        logger.exception('Failed to import {0}!'.format(name))
+        if (sys.version_info >= (3, 0)):
+            logger.exception('Failed to import {0}!'.format(name))
     else:
         logger.info('Successfully imported Honeybee plugin: {}'.format(name))