Do not interpret Enum members called 'description' as description properties

This is a workaround for `TypeError`s being raised when initialising schemas with
Enum members named `description` or `deprecation_reason`.

It is still not ideal as you can't have an enum with both a "description" member
and a description property. Fixing this would require some more thought though.
Potentially we could allow something like `__description__` as an alternative way of
naming the description property in cases where it conflicts with one of the members.

Fixes #1321

graphene/types/schema.py

@@ -1,3 +1,4 @@
+from enum import Enum as PyEnum
 import inspect
 from functools import partial
 
@@ -169,10 +170,16 @@ class TypeMap(dict):
         values = {}
         for name, value in graphene_type._meta.enum.__members__.items():
             description = getattr(value, "description", None)
-            deprecation_reason = getattr(value, "deprecation_reason", None)
+            # if the "description" attribute is an Enum, it is likely an enum member
+            # called description, not a description property
+            if isinstance(description, PyEnum):
+                description = None
             if not description and callable(graphene_type._meta.description):
                 description = graphene_type._meta.description(value)
 
+            deprecation_reason = getattr(value, "deprecation_reason", None)
+            if isinstance(deprecation_reason, PyEnum):
+                deprecation_reason = None
             if not deprecation_reason and callable(
                 graphene_type._meta.deprecation_reason
             ):

graphene/types/tests/test_enum.py

@@ -565,3 +565,36 @@ def test_iterable_instance_creation_enum():
     for c in TestEnum:
         result.append(c.name)
     assert result == expected_values
+
+
+# https://github.com/graphql-python/graphene/issues/1321
+def test_enum_description_member_not_interpreted_as_property():
+    class RGB(Enum):
+        """Description"""
+
+        red = "red"
+        green = "green"
+        blue = "blue"
+        description = "description"
+        deprecation_reason = "deprecation_reason"
+
+    class Query(ObjectType):
+        color = RGB()
+
+        def resolve_color(_, info):
+            return RGB.description
+
+    values = RGB._meta.enum.__members__.values()
+    assert sorted(v.name for v in values) == [
+        "blue",
+        "deprecation_reason",
+        "description",
+        "green",
+        "red",
+    ]
+
+    schema = Schema(query=Query)
+
+    results = schema.execute("query { color }")
+    assert not results.errors
+    assert results.data["color"] == RGB.description.name