Import ABC from collections.abc instead of collections for Python 3 c…

…ompatibility.

src/main/python/fysom/__init__.py

@@ -27,12 +27,16 @@
 # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-import collections
 import functools
 import weakref
 import types
 import sys
 
+try:
+    from collections.abc import Mapping
+except ImportError:
+    from collections import Mapping
+
 __author__ = 'Mansour Behabadi'
 __copyright__ = 'Copyright 2011, Mansour Behabadi and Jake Gordon'
 __credits__ = ['Mansour Behabadi', 'Jake Gordon']
@@ -159,7 +163,7 @@ def __init__(self, cfg={}, initial=None, events=None, callbacks=None,
         # convert 3-tuples in the event specification to dicts
         events_dicts = []
         for e in cfg["events"]:
-            if isinstance(e, collections.Mapping):
+            if isinstance(e, Mapping):
                 events_dicts.append(e)
             elif hasattr(e, "__iter__"):
                 name, src, dst = list(e)[:3]
@@ -520,7 +524,7 @@ def is_very_angry(self, event):
         # convert 3-tuples in the event specification to dicts
         events_dicts = []
         for e in cfg["events"]:
-            if isinstance(e, collections.Mapping):
+            if isinstance(e, Mapping):
                 events_dicts.append(e)
             elif hasattr(e, "__iter__"):
                 name, src, dst = list(e)[:3]