Make Map a subclass of collecitons.abc.Mapping

Author: 1st1

immutables/__init__.py

@@ -2,6 +2,9 @@
     from ._map import Map
 except ImportError:
     from .map import Map
+else:
+    import collections.abc as _abc
+    _abc.Mapping.register(Map)
 
 
 __all__ = 'Map',

immutables/_map.c

@@ -3032,7 +3032,7 @@ static PyMappingMethods Map_as_mapping = {
 
 PyTypeObject _Map_Type = {
     PyVarObject_HEAD_INIT(NULL, 0)
-    "Map",
+    "immutables._map.Map",
     sizeof(MapObject),
     .tp_methods = Map_methods,
     .tp_as_mapping = &Map_as_mapping,

immutables/map.py

@@ -1,3 +1,4 @@
+import collections.abc
 import reprlib
 
 
@@ -457,3 +458,6 @@ def __dump__(self):
         buf = []
         self.__root.dump(buf, 0)
         return '\n'.join(buf)
+
+
+collections.abc.Mapping.register(Map)

tests/test_map.py

@@ -1,3 +1,4 @@
+import collections.abc
 import gc
 import random
 import unittest
@@ -795,6 +796,9 @@ def test_hash_2(self):
             with HaskKeyCrasher(error_on_hash=True):
                 hash(m)
 
+    def test_abc_1(self):
+        self.assertTrue(issubclass(self.Map, collections.abc.Mapping))
+
 
 class PyMapTest(BaseMapTest, unittest.TestCase):