changes to prevent deprecation warnings

setup.py

@@ -34,7 +34,7 @@ def get_long_description():
     url="https://github.com/mitre/stixmarx",
     packages=find_packages(),
     install_requires=[
-        "stix>=1.1.1.8,<1.2.1.0"
+        "stix>=1.1.1.19,<1.2.1.0"
     ],
     license="BSD",
     classifiers=[

stixmarx/markingmap.py

@@ -3,12 +3,19 @@
 
 # stdlib
 import logging
-import collections
+
+# external
+from mixbox.vendor.six import PY2, PY3
 
 # internal
 from stixmarx import xml
 
 
+if PY2:
+    from collections import MutableMapping
+elif PY3:
+    from collections.abc import MutableMapping
+
 # Module-level logger
 LOG = logging.getLogger(__name__)
 
@@ -86,7 +93,7 @@ def __hash__(self):
         return hash((self.name, self.sourcenode, self.parent))
 
 
-class MarkingMap(collections.MutableMapping):
+class MarkingMap(MutableMapping):
     def __init__(self, encoding=None):
         self._inner = {}
         self._encoding = encoding