Improved Mutation warning

UPGRADE-v2.0.md

@@ -9,6 +9,7 @@ developer have to write to use them.
 Deprecations:
 * [`AbstractType`](#abstracttype-deprecated)
 * [`resolve_only_args`](#resolve_only_args)
+* [`Mutation.Input`](#mutation-input)
 
 Breaking changes:
 * [`Node Connections`](#node-connections)
@@ -72,6 +73,26 @@ class User(ObjectType):
         return self.name
 ```
 
+### Mutation.Input
+
+`Mutation.Input` is now deprecated in favor using `Mutation.Arguments` (`ClientIDMutation` still uses `Input`).
+
+Before:
+
+```python
+class User(Mutation):
+    class Input:
+        name = String()
+```
+
+With 2.0:
+
+```python
+class User(Mutation):
+    class Arguments:
+        name = String()
+```
+
 
 ## Breaking Changes
 
@@ -177,6 +198,25 @@ class Dog(ObjectType, interfaces=[Pet]):
     name = String()
 ```
 
+
+### Abstract types
+
+Now you can create abstact types super easily, without the need of subclassing the meta.
+
+```python
+class Base(ObjectType):
+    class Meta:
+        abstract = True
+    
+    id = ID()
+
+    def resolve_id(self):
+        return "{type}_{id}".format(
+            type=self.__class__.__name__,
+            id=self.id
+        )
+```
+
 ### UUID Scalar
 
 In Graphene 2.0 there is a new dedicated scalar for UUIDs, `UUID`.

graphene/types/mutation.py

@@ -6,6 +6,7 @@ from .field import Field
 from .objecttype import ObjectType, ObjectTypeOptions
 from .utils import yank_fields_from_attrs
 from ..utils.auto_resolver import auto_resolver
+from ..utils.deprecated import warn_deprecation
 
 
 class MutationOptions(ObjectTypeOptions):
@@ -40,7 +41,11 @@ class Mutation(ObjectType):
             if not input_class:
                 input_class = getattr(cls, 'Input', None)
                 if input_class:
-                    print("WARNING: Please use Arguments for Mutation (Input is for ClientMutationID)")
+                    warn_deprecation((
+                        "Please use {name}.Arguments instead of {name}.Input."
+                        "Input is now only used in ClientMutationID.\n"
+                        "Read more: https://github.com/graphql-python/graphene/blob/2.0/UPGRADE-v2.0.md#mutation-input"
+                    ).format(name=cls.__name__))
 
             if input_class:
                 arguments = props(input_class)