Added type consistency.

graphene/types/argument.py

@@ -4,6 +4,7 @@ from itertools import chain
 from .mountedtype import MountedType
 from .structures import NonNull
 from .dynamic import Dynamic
+from .utils import get_type
 
 
 class Argument(MountedType):
@@ -15,10 +16,14 @@ class Argument(MountedType):
             type = NonNull(type)
 
         self.name = name
-        self.type = type
+        self._type = type
         self.default_value = default_value
         self.description = description
 
+    @property
+    def type(self):
+        return get_type(self._type)
+
     def __eq__(self, other):
         return isinstance(other, Argument) and (
             self.name == other.name,

graphene/types/tests/test_argument.py

@@ -1,4 +1,5 @@
 import pytest
+from functools import partial
 
 from ..argument import Argument, to_arguments
 from ..field import Field
@@ -61,3 +62,15 @@ def test_to_arguments_raises_if_inputfield():
         to_arguments(args)
 
     assert str(exc_info.value) == 'Expected arg_string to be Argument, but received InputField. Try using Argument(String).'
+
+
+def test_argument_with_lazy_type():
+    MyType = object()
+    arg = Field(lambda: MyType)
+    assert arg.type == MyType
+
+
+def test_argument_with_lazy_partial_type():
+    MyType = object()
+    arg = Field(partial(lambda: MyType))
+    assert arg.type == MyType