Add check for deprecated api between 2 and 3 versions

Author: goanpeca

qtsass/api.py

@@ -13,9 +13,9 @@
 from __future__ import absolute_import, print_function
 
 # Standard library imports
-from collections import Mapping, Sequence
 import logging
 import os
+import sys
 
 # Third party imports
 import sass
@@ -26,6 +26,12 @@
 from qtsass.importers import qss_importer
 
 
+if sys.version_info[0] == 3:
+    from collections.abc import Mapping, Sequence
+else:
+    from collections import Mapping, Sequence
+
+
 # yapf: enable
 
 # Constants