add some tests, fix _has method

ramda/private/_has.py

@@ -8,8 +8,14 @@ def _has(obj, key):
   if key is None:
     return isinstance(obj, dict) and key in obj
   if isinstance(obj, dict):
-    return key in obj or hasattr(obj, key)
+    try:
+      return key in obj or hasattr(obj, key)
+    except(TypeError):
+      return False
   if _isArrayLike(obj):
     if isinstance(key, int):
       return key < len(obj)
-  return hasattr(obj, key)
+  try:
+    return hasattr(obj, key)
+  except(TypeError):
+    return False

test/test_assocPath.py

@@ -38,8 +38,16 @@ def test_empty_path_replaces_the_whole_object(self):
   def test_replaces_None_with_a_new_object(self):
     self.assertEqual({'foo': {'bar': {'baz': 42}}}, R.assocPath(['foo', 'bar', 'baz'], 42, {'foo': None}))
 
+  def test_assoc_with_numeric_index(self):
+    self.assertEqual(['a'], R.assocPath([0], 'a', []))
+    self.assertEqual([['a']], R.assocPath([0, 0], 'a', []))
+    self.assertEqual([[None, 'a']], R.assocPath([0, 1], 'a', []))
+
+    self.assertEqual({0: 'a'}, R.assocPath([0], 'a', {}))
+    self.assertEqual({0: ['a']}, R.assocPath([0, 0], 'a', {}))
+
   def test_throws_exception_if_3rd_argument_is_not_array_nor_object(self):
-    with self.assertRaises(Exception):
+    with self.assertRaises(Exception, msg='We only support dict or array for assoc'):
       R.assocPath([1, 2, 3], 42, 'str')