diff --git a/docs/conf.py b/docs/conf.py
index 26becbc2..0166d4c2 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -64,18 +64,18 @@ source_suffix = ".rst"
 master_doc = "index"
 
 # General information about the project.
-project = u"Graphene"
-copyright = u"Graphene 2016"
-author = u"Syrus Akbary"
+project = "Graphene"
+copyright = "Graphene 2016"
+author = "Syrus Akbary"
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
 # The short X.Y version.
-version = u"1.0"
+version = "1.0"
 # The full version, including alpha/beta/rc tags.
-release = u"1.0"
+release = "1.0"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
@@ -278,7 +278,7 @@ latex_elements = {
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).
 latex_documents = [
-    (master_doc, "Graphene.tex", u"Graphene Documentation", u"Syrus Akbary", "manual")
+    (master_doc, "Graphene.tex", "Graphene Documentation", "Syrus Akbary", "manual")
 ]
 
 # The name of an image file (relative to this directory) to place at the top of
@@ -318,7 +318,7 @@ latex_documents = [
 
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
-man_pages = [(master_doc, "graphene", u"Graphene Documentation", [author], 1)]
+man_pages = [(master_doc, "graphene", "Graphene Documentation", [author], 1)]
 
 # If true, show URL addresses after external links.
 #
@@ -334,7 +334,7 @@ texinfo_documents = [
     (
         master_doc,
         "Graphene",
-        u"Graphene Documentation",
+        "Graphene Documentation",
         author,
         "Graphene",
         "One line description of project.",
diff --git a/examples/simple_example.py b/examples/simple_example.py
index 9bff3070..b13d69c4 100644
--- a/examples/simple_example.py
+++ b/examples/simple_example.py
@@ -8,7 +8,6 @@ class Patron(graphene.ObjectType):
 
 
 class Query(graphene.ObjectType):
-
     patron = graphene.Field(Patron)
 
     def resolve_patron(self, info):
diff --git a/examples/starwars/tests/snapshots/snap_test_query.py b/examples/starwars/tests/snapshots/snap_test_query.py
index b4f05bdb..ff6d2d82 100644
--- a/examples/starwars/tests/snapshots/snap_test_query.py
+++ b/examples/starwars/tests/snapshots/snap_test_query.py
@@ -1,6 +1,4 @@
-# -*- coding: utf-8 -*-
 # snapshottest: v1 - https://goo.gl/zC4yUc
-from __future__ import unicode_literals
 
 from snapshottest import Snapshot
 
diff --git a/examples/starwars_relay/tests/snapshots/snap_test_connections.py b/examples/starwars_relay/tests/snapshots/snap_test_connections.py
index 57a7b7ea..f3181e45 100644
--- a/examples/starwars_relay/tests/snapshots/snap_test_connections.py
+++ b/examples/starwars_relay/tests/snapshots/snap_test_connections.py
@@ -1,6 +1,4 @@
-# -*- coding: utf-8 -*-
 # snapshottest: v1 - https://goo.gl/zC4yUc
-from __future__ import unicode_literals
 
 from snapshottest import Snapshot
 
diff --git a/examples/starwars_relay/tests/snapshots/snap_test_mutation.py b/examples/starwars_relay/tests/snapshots/snap_test_mutation.py
index 4608bdaf..db438891 100644
--- a/examples/starwars_relay/tests/snapshots/snap_test_mutation.py
+++ b/examples/starwars_relay/tests/snapshots/snap_test_mutation.py
@@ -1,6 +1,4 @@
-# -*- coding: utf-8 -*-
 # snapshottest: v1 - https://goo.gl/zC4yUc
-from __future__ import unicode_literals
 
 from snapshottest import Snapshot
 
diff --git a/examples/starwars_relay/tests/snapshots/snap_test_objectidentification.py b/examples/starwars_relay/tests/snapshots/snap_test_objectidentification.py
index 2d13cba3..6e252933 100644
--- a/examples/starwars_relay/tests/snapshots/snap_test_objectidentification.py
+++ b/examples/starwars_relay/tests/snapshots/snap_test_objectidentification.py
@@ -1,6 +1,4 @@
-# -*- coding: utf-8 -*-
 # snapshottest: v1 - https://goo.gl/zC4yUc
-from __future__ import unicode_literals
 
 from snapshottest import Snapshot
 
diff --git a/graphene/pyutils/compat.py b/graphene/pyutils/compat.py
index 2581446b..c730676d 100644
--- a/graphene/pyutils/compat.py
+++ b/graphene/pyutils/compat.py
@@ -1,5 +1,3 @@
-from __future__ import absolute_import
-
 from graphql.pyutils.compat import Enum
 
 try:
diff --git a/graphene/pyutils/init_subclass.py b/graphene/pyutils/init_subclass.py
index 81198c9c..58d55779 100644
--- a/graphene/pyutils/init_subclass.py
+++ b/graphene/pyutils/init_subclass.py
@@ -10,14 +10,13 @@ if not is_init_subclass_available:
             if __init_subclass__:
                 __init_subclass__ = classmethod(__init_subclass__)
                 ns["__init_subclass__"] = __init_subclass__
-            return super(InitSubclassMeta, cls).__new__(cls, name, bases, ns, **kwargs)
+            return super().__new__(cls, name, bases, ns, **kwargs)
 
         def __init__(cls, name, bases, ns, **kwargs):
-            super(InitSubclassMeta, cls).__init__(name, bases, ns)
+            super().__init__(name, bases, ns)
             super_class = super(cls, cls)
             if hasattr(super_class, "__init_subclass__"):
                 super_class.__init_subclass__.__func__(cls, **kwargs)
 
-
 else:
     InitSubclassMeta = type  # type: ignore
diff --git a/graphene/pyutils/signature.py b/graphene/pyutils/signature.py
index 7757d9d0..43c62265 100644
--- a/graphene/pyutils/signature.py
+++ b/graphene/pyutils/signature.py
@@ -3,7 +3,6 @@
 Back port of Python 3.3's function signature tools from the inspect module,
 modified to be compatible with Python 2.7 and 3.2+.
 """
-from __future__ import absolute_import, division, print_function
 
 import functools
 import itertools
@@ -177,11 +176,11 @@ def signature(obj):
     raise ValueError("callable {!r} is not supported by signature".format(obj))
 
 
-class _void(object):
+class _void:
     """A private marker - used in Parameter & Signature"""
 
 
-class _empty(object):
+class _empty:
     pass
 
 
@@ -205,7 +204,7 @@ _KEYWORD_ONLY = _ParameterKind(3, name="KEYWORD_ONLY")
 _VAR_KEYWORD = _ParameterKind(4, name="VAR_KEYWORD")
 
 
-class Parameter(object):
+class Parameter:
     """Represents a parameter in a function signature.
     Has the following public attributes:
     * name : str
@@ -236,7 +235,6 @@ class Parameter(object):
     def __init__(
         self, name, kind, default=_empty, annotation=_empty, _partial_kwarg=False
     ):
-
         if kind not in (
             _POSITIONAL_ONLY,
             _POSITIONAL_OR_KEYWORD,
@@ -361,7 +359,7 @@ class Parameter(object):
         return not self.__eq__(other)
 
 
-class BoundArguments(object):
+class BoundArguments:
     """Result of `Signature.bind` call.  Holds the mapping of arguments
     to the function's parameters.
     Has the following public attributes:
@@ -456,7 +454,7 @@ class BoundArguments(object):
         return not self.__eq__(other)
 
 
-class Signature(object):
+class Signature:
     """A Signature object represents the overall signature of a function.
     It stores a Parameter object for each parameter accepted by the
     function, as well as information specific to the function itself.
@@ -517,7 +515,7 @@ class Signature(object):
                         raise ValueError(msg)
                     params[name] = param
             else:
-                params = OrderedDict(((param.name, param) for param in parameters))
+                params = OrderedDict((param.name, param) for param in parameters)
 
         self._parameters = params
         self._return_annotation = return_annotation
diff --git a/graphene/pyutils/version.py b/graphene/pyutils/version.py
index f2005442..f3a11ae9 100644
--- a/graphene/pyutils/version.py
+++ b/graphene/pyutils/version.py
@@ -1,5 +1,3 @@
-from __future__ import unicode_literals
-
 import datetime
 import os
 import subprocess
diff --git a/graphene/relay/connection.py b/graphene/relay/connection.py
index c05160b5..fb92562b 100644
--- a/graphene/relay/connection.py
+++ b/graphene/relay/connection.py
@@ -4,7 +4,7 @@ from collections import OrderedDict
 try:
     from collections.abc import Iterable
 except ImportError:
-    from collections import Iterable
+    from collections.abc import Iterable
 
 from functools import partial
 
@@ -72,7 +72,7 @@ class Connection(ObjectType):
         edge_class = getattr(cls, "Edge", None)
         _node = node
 
-        class EdgeBase(object):
+        class EdgeBase:
             node = Field(_node, description="The item at the end of the edge")
             cursor = String(required=True, description="A cursor for use in pagination")
 
@@ -112,9 +112,7 @@ class Connection(ObjectType):
                 ),
             ]
         )
-        return super(Connection, cls).__init_subclass_with_meta__(
-            _meta=_meta, **options
-        )
+        return super().__init_subclass_with_meta__(_meta=_meta, **options)
 
 
 class IterableConnectionField(Field):
@@ -123,11 +121,11 @@ class IterableConnectionField(Field):
         kwargs.setdefault("after", String())
         kwargs.setdefault("first", Int())
         kwargs.setdefault("last", Int())
-        super(IterableConnectionField, self).__init__(type, *args, **kwargs)
+        super().__init__(type, *args, **kwargs)
 
     @property
     def type(self):
-        type = super(IterableConnectionField, self).type
+        type = super().type
         connection_type = type
         if isinstance(type, NonNull):
             connection_type = type.of_type
@@ -173,7 +171,7 @@ class IterableConnectionField(Field):
         return maybe_thenable(resolved, on_resolve)
 
     def get_resolver(self, parent_resolver):
-        resolver = super(IterableConnectionField, self).get_resolver(parent_resolver)
+        resolver = super().get_resolver(parent_resolver)
         return partial(self.connection_resolver, resolver, self.type)
 
 
diff --git a/graphene/relay/mutation.py b/graphene/relay/mutation.py
index ee758e78..eee14656 100644
--- a/graphene/relay/mutation.py
+++ b/graphene/relay/mutation.py
@@ -49,7 +49,7 @@ class ClientIDMutation(Mutation):
         if not name:
             name = "{}Payload".format(base_name)
 
-        super(ClientIDMutation, cls).__init_subclass_with_meta__(
+        super().__init_subclass_with_meta__(
             output=None, arguments=arguments, name=name, **options
         )
         cls._meta.fields["client_mutation_id"] = Field(String, name="clientMutationId")
diff --git a/graphene/relay/node.py b/graphene/relay/node.py
index 4b324a93..a86b0ae7 100644
--- a/graphene/relay/node.py
+++ b/graphene/relay/node.py
@@ -28,7 +28,7 @@ def is_node(objecttype):
 
 class GlobalID(Field):
     def __init__(self, node=None, parent_type=None, required=True, *args, **kwargs):
-        super(GlobalID, self).__init__(ID, required=required, *args, **kwargs)
+        super().__init__(ID, required=required, *args, **kwargs)
         self.node = node or Node
         self.parent_type_name = parent_type._meta.name if parent_type else None
 
@@ -53,7 +53,7 @@ class NodeField(Field):
         self.node_type = node
         self.field_type = type
 
-        super(NodeField, self).__init__(
+        super().__init__(
             # If we don's specify a type, the field type will be the node
             # interface
             type or node,
@@ -75,7 +75,7 @@ class AbstractNode(Interface):
         _meta.fields = OrderedDict(
             id=GlobalID(cls, description="The ID of the object.")
         )
-        super(AbstractNode, cls).__init_subclass_with_meta__(_meta=_meta, **options)
+        super().__init_subclass_with_meta__(_meta=_meta, **options)
 
 
 class Node(AbstractNode):
diff --git a/graphene/relay/tests/test_connection.py b/graphene/relay/tests/test_connection.py
index 6686f964..35bfde1f 100644
--- a/graphene/relay/tests/test_connection.py
+++ b/graphene/relay/tests/test_connection.py
@@ -39,7 +39,7 @@ def test_connection():
 
 
 def test_connection_inherit_abstracttype():
-    class BaseConnection(object):
+    class BaseConnection:
         extra = String()
 
     class MyObjectConnection(BaseConnection, Connection):
@@ -54,7 +54,7 @@ def test_connection_inherit_abstracttype():
 def test_connection_name():
     custom_name = "MyObjectCustomNameConnection"
 
-    class BaseConnection(object):
+    class BaseConnection:
         extra = String()
 
     class MyObjectConnection(BaseConnection, Connection):
@@ -86,7 +86,7 @@ def test_edge():
 
 
 def test_edge_with_bases():
-    class BaseEdge(object):
+    class BaseEdge:
         extra = String()
 
     class MyObjectConnection(Connection):
diff --git a/graphene/relay/tests/test_global_id.py b/graphene/relay/tests/test_global_id.py
index 6d328f23..2fe81300 100644
--- a/graphene/relay/tests/test_global_id.py
+++ b/graphene/relay/tests/test_global_id.py
@@ -17,7 +17,7 @@ class User(ObjectType):
     name = String()
 
 
-class Info(object):
+class Info:
     def __init__(self, parent_type):
         self.parent_type = GrapheneObjectType(
             graphene_type=parent_type,
diff --git a/graphene/relay/tests/test_mutation.py b/graphene/relay/tests/test_mutation.py
index b58a3ddf..c9540860 100644
--- a/graphene/relay/tests/test_mutation.py
+++ b/graphene/relay/tests/test_mutation.py
@@ -15,7 +15,7 @@ from ...types.scalars import String
 from ..mutation import ClientIDMutation
 
 
-class SharedFields(object):
+class SharedFields:
     shared = String()
 
 
@@ -37,7 +37,7 @@ class SaySomething(ClientIDMutation):
         return SaySomething(phrase=str(what))
 
 
-class FixedSaySomething(object):
+class FixedSaySomething:
     __slots__ = ("phrase",)
 
     def __init__(self, phrase):
diff --git a/graphene/relay/tests/test_node.py b/graphene/relay/tests/test_node.py
index a0f40608..c58adfdf 100644
--- a/graphene/relay/tests/test_node.py
+++ b/graphene/relay/tests/test_node.py
@@ -6,8 +6,7 @@ from ...types import ObjectType, Schema, String
 from ..node import Node, is_node
 
 
-class SharedNodeFields(object):
-
+class SharedNodeFields:
     shared = String()
     something_else = String()
 
diff --git a/graphene/test/__init__.py b/graphene/test/__init__.py
index 7d554fb6..96e7d94d 100644
--- a/graphene/test/__init__.py
+++ b/graphene/test/__init__.py
@@ -24,7 +24,7 @@ def format_execution_result(execution_result, format_error):
         return response
 
 
-class Client(object):
+class Client:
     def __init__(self, schema, format_error=None, **execute_options):
         assert isinstance(schema, Schema)
         self.schema = schema
diff --git a/graphene/tests/issues/test_425.py b/graphene/tests/issues/test_425.py
index 50c18758..66cb570a 100644
--- a/graphene/tests/issues/test_425.py
+++ b/graphene/tests/issues/test_425.py
@@ -16,9 +16,7 @@ class SpecialObjectType(ObjectType):
     def __init_subclass_with_meta__(cls, other_attr="default", **options):
         _meta = SpecialOptions(cls)
         _meta.other_attr = other_attr
-        super(SpecialObjectType, cls).__init_subclass_with_meta__(
-            _meta=_meta, **options
-        )
+        super().__init_subclass_with_meta__(_meta=_meta, **options)
 
 
 def test_special_objecttype_could_be_subclassed():
@@ -55,9 +53,7 @@ class SpecialInputObjectType(InputObjectType):
     def __init_subclass_with_meta__(cls, other_attr="default", **options):
         _meta = SpecialInputObjectTypeOptions(cls)
         _meta.other_attr = other_attr
-        super(SpecialInputObjectType, cls).__init_subclass_with_meta__(
-            _meta=_meta, **options
-        )
+        super().__init_subclass_with_meta__(_meta=_meta, **options)
 
 
 def test_special_inputobjecttype_could_be_subclassed():
@@ -92,7 +88,7 @@ class SpecialEnum(Enum):
     def __init_subclass_with_meta__(cls, other_attr="default", **options):
         _meta = SpecialEnumOptions(cls)
         _meta.other_attr = other_attr
-        super(SpecialEnum, cls).__init_subclass_with_meta__(_meta=_meta, **options)
+        super().__init_subclass_with_meta__(_meta=_meta, **options)
 
 
 def test_special_enum_could_be_subclassed():
diff --git a/graphene/tests/issues/test_720.py b/graphene/tests/issues/test_720.py
index ea961b25..fa1be25f 100644
--- a/graphene/tests/issues/test_720.py
+++ b/graphene/tests/issues/test_720.py
@@ -14,9 +14,7 @@ class MyInputClass(graphene.InputObjectType):
         if _meta is None:
             _meta = graphene.types.inputobjecttype.InputObjectTypeOptions(cls)
         _meta.fields = fields
-        super(MyInputClass, cls).__init_subclass_with_meta__(
-            container=container, _meta=_meta, **options
-        )
+        super().__init_subclass_with_meta__(container=container, _meta=_meta, **options)
 
 
 class MyInput(MyInputClass):
diff --git a/graphene/types/abstracttype.py b/graphene/types/abstracttype.py
index 4eeb7f9c..16fe08c9 100644
--- a/graphene/types/abstracttype.py
+++ b/graphene/types/abstracttype.py
@@ -8,4 +8,4 @@ class AbstractType(SubclassWithMeta):
             "Abstract type is deprecated, please use normal object inheritance instead.\n"
             "See more: https://github.com/graphql-python/graphene/blob/master/UPGRADE-v2.0.md#deprecations"
         )
-        super(AbstractType, cls).__init_subclass__(*args, **kwargs)
+        super().__init_subclass__(*args, **kwargs)
diff --git a/graphene/types/argument.py b/graphene/types/argument.py
index cb72322c..495e6239 100644
--- a/graphene/types/argument.py
+++ b/graphene/types/argument.py
@@ -48,7 +48,7 @@ class Argument(MountedType):
         required=False,
         _creation_counter=None,
     ):
-        super(Argument, self).__init__(_creation_counter=_creation_counter)
+        super().__init__(_creation_counter=_creation_counter)
 
         if required:
             type = NonNull(type)
diff --git a/graphene/types/base.py b/graphene/types/base.py
index 3bbebbe3..f6cf682d 100644
--- a/graphene/types/base.py
+++ b/graphene/types/base.py
@@ -4,7 +4,7 @@ from ..utils.trim_docstring import trim_docstring
 from typing import Type
 
 
-class BaseOptions(object):
+class BaseOptions:
     name = None  # type: str
     description = None  # type: str
 
@@ -18,7 +18,7 @@ class BaseOptions(object):
 
     def __setattr__(self, name, value):
         if not self._frozen:
-            super(BaseOptions, self).__setattr__(name, value)
+            super().__setattr__(name, value)
         else:
             raise Exception("Can't modify frozen Options {}".format(self))
 
@@ -42,4 +42,4 @@ class BaseType(SubclassWithMeta):
         _meta.description = description or trim_docstring(cls.__doc__)
         _meta.freeze()
         cls._meta = _meta
-        super(BaseType, cls).__init_subclass_with_meta__()
+        super().__init_subclass_with_meta__()
diff --git a/graphene/types/context.py b/graphene/types/context.py
index 70b1a5b2..fa405179 100644
--- a/graphene/types/context.py
+++ b/graphene/types/context.py
@@ -1,4 +1,4 @@
-class Context(object):
+class Context:
     """
     Context can be used to make a convenient container for attributes to provide
     for execution for resolvers of a GraphQL operation like a query.
diff --git a/graphene/types/datetime.py b/graphene/types/datetime.py
index ca96547f..df0b4352 100644
--- a/graphene/types/datetime.py
+++ b/graphene/types/datetime.py
@@ -1,5 +1,3 @@
-from __future__ import absolute_import
-
 import datetime
 
 from aniso8601 import parse_date, parse_datetime, parse_time
diff --git a/graphene/types/decimal.py b/graphene/types/decimal.py
index 2f99134d..92b9fa21 100644
--- a/graphene/types/decimal.py
+++ b/graphene/types/decimal.py
@@ -1,5 +1,3 @@
-from __future__ import absolute_import
-
 from decimal import Decimal as _Decimal
 
 from graphql.language import ast
diff --git a/graphene/types/definitions.py b/graphene/types/definitions.py
index a914008c..b097de93 100644
--- a/graphene/types/definitions.py
+++ b/graphene/types/definitions.py
@@ -8,7 +8,7 @@ from graphql import (
 )
 
 
-class GrapheneGraphQLType(object):
+class GrapheneGraphQLType:
     """
     A class for extending the base GraphQLType with the related
     graphene_type
@@ -16,7 +16,7 @@ class GrapheneGraphQLType(object):
 
     def __init__(self, *args, **kwargs):
         self.graphene_type = kwargs.pop("graphene_type")
-        super(GrapheneGraphQLType, self).__init__(*args, **kwargs)
+        super().__init__(*args, **kwargs)
 
 
 class GrapheneInterfaceType(GrapheneGraphQLType, GraphQLInterfaceType):
diff --git a/graphene/types/dynamic.py b/graphene/types/dynamic.py
index 588c53bb..97f34067 100644
--- a/graphene/types/dynamic.py
+++ b/graphene/types/dynamic.py
@@ -11,7 +11,7 @@ class Dynamic(MountedType):
     """
 
     def __init__(self, type, with_schema=False, _creation_counter=None):
-        super(Dynamic, self).__init__(_creation_counter=_creation_counter)
+        super().__init__(_creation_counter=_creation_counter)
         assert inspect.isfunction(type) or isinstance(type, partial)
         self.type = type
         self.with_schema = with_schema
diff --git a/graphene/types/enum.py b/graphene/types/enum.py
index 38dada0f..ad1ba5d5 100644
--- a/graphene/types/enum.py
+++ b/graphene/types/enum.py
@@ -50,7 +50,7 @@ class EnumMeta(SubclassWithMeta_Meta):
                 description=description,
                 deprecation_reason=deprecation_reason,
             )
-        return super(EnumMeta, cls).__call__(*args, **kwargs)
+        return super().__call__(*args, **kwargs)
         # return cls._meta.enum(*args, **kwargs)
 
     def from_enum(cls, enum, description=None, deprecation_reason=None):  # noqa: N805
@@ -98,7 +98,7 @@ class Enum(UnmountedType, BaseType, metaclass=EnumMeta):
         for key, value in _meta.enum.__members__.items():
             setattr(cls, key, value)
 
-        super(Enum, cls).__init_subclass_with_meta__(_meta=_meta, **options)
+        super().__init_subclass_with_meta__(_meta=_meta, **options)
 
     @classmethod
     def get_type(cls):
diff --git a/graphene/types/field.py b/graphene/types/field.py
index 39db65e9..82dd6169 100644
--- a/graphene/types/field.py
+++ b/graphene/types/field.py
@@ -4,7 +4,7 @@ from collections import OrderedDict
 try:
     from collections.abc import Mapping
 except ImportError:
-    from collections import Mapping
+    from collections.abc import Mapping
 
 from functools import partial
 
@@ -80,7 +80,7 @@ class Field(MountedType):
         default_value=None,
         **extra_args
     ):
-        super(Field, self).__init__(_creation_counter=_creation_counter)
+        super().__init__(_creation_counter=_creation_counter)
         assert not args or isinstance(args, Mapping), (
             'Arguments in a field have to be a mapping, received "{}".'
         ).format(args)
diff --git a/graphene/types/generic.py b/graphene/types/generic.py
index e5470dd9..e41dbb9c 100644
--- a/graphene/types/generic.py
+++ b/graphene/types/generic.py
@@ -1,5 +1,3 @@
-from __future__ import unicode_literals
-
 from graphql.language.ast import (
     BooleanValue,
     FloatValue,
diff --git a/graphene/types/inputfield.py b/graphene/types/inputfield.py
index ed9b96ab..5de03484 100644
--- a/graphene/types/inputfield.py
+++ b/graphene/types/inputfield.py
@@ -55,7 +55,7 @@ class InputField(MountedType):
         _creation_counter=None,
         **extra_args
     ):
-        super(InputField, self).__init__(_creation_counter=_creation_counter)
+        super().__init__(_creation_counter=_creation_counter)
         self.name = name
         if required:
             type = NonNull(type)
diff --git a/graphene/types/inputobjecttype.py b/graphene/types/inputobjecttype.py
index d1368931..e49d75f6 100644
--- a/graphene/types/inputobjecttype.py
+++ b/graphene/types/inputobjecttype.py
@@ -81,7 +81,7 @@ class InputObjectType(UnmountedType, BaseType):
         if container is None:
             container = type(cls.__name__, (InputObjectTypeContainer, cls), {})
         _meta.container = container
-        super(InputObjectType, cls).__init_subclass_with_meta__(_meta=_meta, **options)
+        super().__init_subclass_with_meta__(_meta=_meta, **options)
 
     @classmethod
     def get_type(cls):
diff --git a/graphene/types/interface.py b/graphene/types/interface.py
index 59184a1f..9db7bca3 100644
--- a/graphene/types/interface.py
+++ b/graphene/types/interface.py
@@ -60,7 +60,7 @@ class Interface(BaseType):
         else:
             _meta.fields = fields
 
-        super(Interface, cls).__init_subclass_with_meta__(_meta=_meta, **options)
+        super().__init_subclass_with_meta__(_meta=_meta, **options)
 
     @classmethod
     def resolve_type(cls, instance, info):
diff --git a/graphene/types/json.py b/graphene/types/json.py
index 6b87ae6e..972391bd 100644
--- a/graphene/types/json.py
+++ b/graphene/types/json.py
@@ -1,5 +1,3 @@
-from __future__ import absolute_import
-
 import json
 
 from graphql.language import ast
diff --git a/graphene/types/mutation.py b/graphene/types/mutation.py
index 31c32284..bd297cc1 100644
--- a/graphene/types/mutation.py
+++ b/graphene/types/mutation.py
@@ -129,7 +129,7 @@ class Mutation(ObjectType):
         _meta.resolver = resolver
         _meta.arguments = arguments
 
-        super(Mutation, cls).__init_subclass_with_meta__(_meta=_meta, **options)
+        super().__init_subclass_with_meta__(_meta=_meta, **options)
 
     @classmethod
     def Field(
diff --git a/graphene/types/objecttype.py b/graphene/types/objecttype.py
index 88c9f5bc..b01bf4c1 100644
--- a/graphene/types/objecttype.py
+++ b/graphene/types/objecttype.py
@@ -126,7 +126,7 @@ class ObjectType(BaseType):
         _meta.possible_types = possible_types
         _meta.default_resolver = default_resolver
 
-        super(ObjectType, cls).__init_subclass_with_meta__(_meta=_meta, **options)
+        super().__init_subclass_with_meta__(_meta=_meta, **options)
 
     is_type_of = None
 
diff --git a/graphene/types/scalars.py b/graphene/types/scalars.py
index 769c406f..d3c0272b 100644
--- a/graphene/types/scalars.py
+++ b/graphene/types/scalars.py
@@ -22,7 +22,7 @@ class Scalar(UnmountedType, BaseType):
     @classmethod
     def __init_subclass_with_meta__(cls, **options):
         _meta = ScalarOptions(cls)
-        super(Scalar, cls).__init_subclass_with_meta__(_meta=_meta, **options)
+        super().__init_subclass_with_meta__(_meta=_meta, **options)
 
     serialize = None
     parse_value = None
@@ -111,7 +111,7 @@ class String(Scalar):
     @staticmethod
     def coerce_string(value):
         if isinstance(value, bool):
-            return u"true" if value else u"false"
+            return "true" if value else "false"
         return str(value)
 
     serialize = coerce_string
diff --git a/graphene/types/schema.py b/graphene/types/schema.py
index 738ed746..4d2d8038 100644
--- a/graphene/types/schema.py
+++ b/graphene/types/schema.py
@@ -93,7 +93,7 @@ class Schema(GraphQLSchema):
 
         Example: using schema.Query for accessing the "Query" type in the Schema
         """
-        _type = super(Schema, self).get_type(type_name)
+        _type = super().get_type(type_name)
         if _type is None:
             raise AttributeError('Type "{}" not found in the Schema'.format(type_name))
         if isinstance(_type, GrapheneGraphQLType):
diff --git a/graphene/types/structures.py b/graphene/types/structures.py
index 3341e022..470651f4 100644
--- a/graphene/types/structures.py
+++ b/graphene/types/structures.py
@@ -9,7 +9,7 @@ class Structure(UnmountedType):
     """
 
     def __init__(self, of_type, *args, **kwargs):
-        super(Structure, self).__init__(*args, **kwargs)
+        super().__init__(*args, **kwargs)
         if not isinstance(of_type, Structure) and isinstance(of_type, UnmountedType):
             cls_name = type(self).__name__
             of_type_name = type(of_type).__name__
@@ -84,7 +84,7 @@ class NonNull(Structure):
     """
 
     def __init__(self, *args, **kwargs):
-        super(NonNull, self).__init__(*args, **kwargs)
+        super().__init__(*args, **kwargs)
         assert not isinstance(self._of_type, NonNull), (
             "Can only create NonNull of a Nullable GraphQLType but got: {}."
         ).format(self._of_type)
diff --git a/graphene/types/tests/test_base.py b/graphene/types/tests/test_base.py
index 2f70903c..8456bd52 100644
--- a/graphene/types/tests/test_base.py
+++ b/graphene/types/tests/test_base.py
@@ -9,7 +9,7 @@ class CustomType(BaseType):
     @classmethod
     def __init_subclass_with_meta__(cls, **options):
         _meta = CustomOptions(cls)
-        super(CustomType, cls).__init_subclass_with_meta__(_meta=_meta, **options)
+        super().__init_subclass_with_meta__(_meta=_meta, **options)
 
 
 def test_basetype():
diff --git a/graphene/types/tests/test_definition.py b/graphene/types/tests/test_definition.py
index 549847d5..1e3ea8bc 100644
--- a/graphene/types/tests/test_definition.py
+++ b/graphene/types/tests/test_definition.py
@@ -281,7 +281,7 @@ def test_stringifies_simple_types():
 
 
 def test_does_not_mutate_passed_field_definitions():
-    class CommonFields(object):
+    class CommonFields:
         field1 = String()
         field2 = String(id=String())
 
@@ -293,7 +293,7 @@ def test_does_not_mutate_passed_field_definitions():
 
     assert TestObject1._meta.fields == TestObject2._meta.fields
 
-    class CommonFields(object):
+    class CommonFields:
         field1 = String()
         field2 = String()
 
diff --git a/graphene/types/tests/test_enum.py b/graphene/types/tests/test_enum.py
index b29764f2..e0937992 100644
--- a/graphene/types/tests/test_enum.py
+++ b/graphene/types/tests/test_enum.py
@@ -113,7 +113,6 @@ def test_enum_from_builtin_enum_accepts_lambda_description():
 
 
 def test_enum_from_python3_enum_uses_enum_doc():
-
     from enum import Enum as PyEnum
 
     class Color(PyEnum):
diff --git a/graphene/types/tests/test_field.py b/graphene/types/tests/test_field.py
index 13c755fc..60bf3684 100644
--- a/graphene/types/tests/test_field.py
+++ b/graphene/types/tests/test_field.py
@@ -9,7 +9,7 @@ from ..structures import NonNull
 from .utils import MyLazyType
 
 
-class MyInstance(object):
+class MyInstance:
     value = "value"
     value_func = staticmethod(lambda: "value_func")
 
diff --git a/graphene/types/tests/test_inputobjecttype.py b/graphene/types/tests/test_inputobjecttype.py
index dc557b94..0ae6673c 100644
--- a/graphene/types/tests/test_inputobjecttype.py
+++ b/graphene/types/tests/test_inputobjecttype.py
@@ -8,7 +8,7 @@ from ..schema import Schema
 from ..unmountedtype import UnmountedType
 
 
-class MyType(object):
+class MyType:
     pass
 
 
@@ -78,7 +78,7 @@ def test_generate_inputobjecttype_as_argument():
 
 
 def test_generate_inputobjecttype_inherit_abstracttype():
-    class MyAbstractType(object):
+    class MyAbstractType:
         field1 = MyScalar(MyType)
 
     class MyInputObjectType(InputObjectType, MyAbstractType):
@@ -92,7 +92,7 @@ def test_generate_inputobjecttype_inherit_abstracttype():
 
 
 def test_generate_inputobjecttype_inherit_abstracttype_reversed():
-    class MyAbstractType(object):
+    class MyAbstractType:
         field1 = MyScalar(MyType)
 
     class MyInputObjectType(MyAbstractType, InputObjectType):
diff --git a/graphene/types/tests/test_interface.py b/graphene/types/tests/test_interface.py
index b524296b..df85472f 100644
--- a/graphene/types/tests/test_interface.py
+++ b/graphene/types/tests/test_interface.py
@@ -3,7 +3,7 @@ from ..interface import Interface
 from ..unmountedtype import UnmountedType
 
 
-class MyType(object):
+class MyType:
     pass
 
 
@@ -57,7 +57,7 @@ def test_generate_interface_unmountedtype():
 
 
 def test_generate_interface_inherit_abstracttype():
-    class MyAbstractType(object):
+    class MyAbstractType:
         field1 = MyScalar()
 
     class MyInterface(Interface, MyAbstractType):
@@ -80,7 +80,7 @@ def test_generate_interface_inherit_interface():
 
 
 def test_generate_interface_inherit_abstracttype_reversed():
-    class MyAbstractType(object):
+    class MyAbstractType:
         field1 = MyScalar()
 
     class MyInterface(MyAbstractType, Interface):
diff --git a/graphene/types/tests/test_mountedtype.py b/graphene/types/tests/test_mountedtype.py
index b964233e..2e8e9437 100644
--- a/graphene/types/tests/test_mountedtype.py
+++ b/graphene/types/tests/test_mountedtype.py
@@ -5,7 +5,7 @@ from ..scalars import String
 class CustomField(Field):
     def __init__(self, *args, **kwargs):
         self.metadata = kwargs.pop("metadata", None)
-        super(CustomField, self).__init__(*args, **kwargs)
+        super().__init__(*args, **kwargs)
 
 
 def test_mounted_type():
diff --git a/graphene/types/tests/test_objecttype.py b/graphene/types/tests/test_objecttype.py
index 2acb578f..97ae4dad 100644
--- a/graphene/types/tests/test_objecttype.py
+++ b/graphene/types/tests/test_objecttype.py
@@ -106,7 +106,7 @@ def test_ordered_fields_in_objecttype():
 
 
 def test_generate_objecttype_inherit_abstracttype():
-    class MyAbstractType(object):
+    class MyAbstractType:
         field1 = MyScalar()
 
     class MyObjectType(ObjectType, MyAbstractType):
@@ -120,7 +120,7 @@ def test_generate_objecttype_inherit_abstracttype():
 
 
 def test_generate_objecttype_inherit_abstracttype_reversed():
-    class MyAbstractType(object):
+    class MyAbstractType:
         field1 = MyScalar()
 
     class MyObjectType(MyAbstractType, ObjectType):
diff --git a/graphene/types/tests/test_query.py b/graphene/types/tests/test_query.py
index 0885e22b..69b0fa8f 100644
--- a/graphene/types/tests/test_query.py
+++ b/graphene/types/tests/test_query.py
@@ -28,7 +28,7 @@ def test_query():
 
 
 def test_query_source():
-    class Root(object):
+    class Root:
         _hello = "World"
 
         def hello(self):
@@ -45,10 +45,10 @@ def test_query_source():
 
 
 def test_query_union():
-    class one_object(object):
+    class one_object:
         pass
 
-    class two_object(object):
+    class two_object:
         pass
 
     class One(ObjectType):
@@ -83,10 +83,10 @@ def test_query_union():
 
 
 def test_query_interface():
-    class one_object(object):
+    class one_object:
         pass
 
-    class two_object(object):
+    class two_object:
         pass
 
     class MyInterface(Interface):
diff --git a/graphene/types/tests/test_resolver.py b/graphene/types/tests/test_resolver.py
index a03cf187..dcadb6d8 100644
--- a/graphene/types/tests/test_resolver.py
+++ b/graphene/types/tests/test_resolver.py
@@ -13,7 +13,7 @@ info = None
 demo_dict = {"attr": "value"}
 
 
-class demo_obj(object):
+class demo_obj:
     attr = "value"
 
 
diff --git a/graphene/types/tests/test_scalars_serialization.py b/graphene/types/tests/test_scalars_serialization.py
index a95e8bd4..a91efe2c 100644
--- a/graphene/types/tests/test_scalars_serialization.py
+++ b/graphene/types/tests/test_scalars_serialization.py
@@ -38,7 +38,7 @@ def test_serializes_output_string():
     assert String.serialize(-1.1) == "-1.1"
     assert String.serialize(True) == "true"
     assert String.serialize(False) == "false"
-    assert String.serialize(u"\U0001F601") == u"\U0001F601"
+    assert String.serialize("\U0001F601") == "\U0001F601"
 
 
 def test_serializes_output_boolean():
diff --git a/graphene/types/typemap.py b/graphene/types/typemap.py
index 9edb8518..d66a3f5e 100644
--- a/graphene/types/typemap.py
+++ b/graphene/types/typemap.py
@@ -77,7 +77,7 @@ class TypeMap(GraphQLTypeMap):
     def __init__(self, types, auto_camelcase=True, schema=None):
         self.auto_camelcase = auto_camelcase
         self.schema = schema
-        super(TypeMap, self).__init__(types)
+        super().__init__(types)
 
     def reducer(self, map, type):
         if not type:
diff --git a/graphene/types/union.py b/graphene/types/union.py
index 194ba1da..f38d457b 100644
--- a/graphene/types/union.py
+++ b/graphene/types/union.py
@@ -57,7 +57,7 @@ class Union(UnmountedType, BaseType):
 
         _meta = UnionOptions(cls)
         _meta.types = types
-        super(Union, cls).__init_subclass_with_meta__(_meta=_meta, **options)
+        super().__init_subclass_with_meta__(_meta=_meta, **options)
 
     @classmethod
     def get_type(cls):
diff --git a/graphene/types/unmountedtype.py b/graphene/types/unmountedtype.py
index 081c4ba0..574d3986 100644
--- a/graphene/types/unmountedtype.py
+++ b/graphene/types/unmountedtype.py
@@ -40,7 +40,7 @@ class UnmountedType(OrderedType):
     """
 
     def __init__(self, *args, **kwargs):
-        super(UnmountedType, self).__init__()
+        super().__init__()
         self.args = args
         self.kwargs = kwargs
 
diff --git a/graphene/types/uuid.py b/graphene/types/uuid.py
index d6d35eed..e0148b0a 100644
--- a/graphene/types/uuid.py
+++ b/graphene/types/uuid.py
@@ -1,4 +1,3 @@
-from __future__ import absolute_import
 from uuid import UUID as _UUID
 
 from graphql.language import ast
diff --git a/graphene/utils/crunch.py b/graphene/utils/crunch.py
index a84a0d31..e6d1542a 100644
--- a/graphene/utils/crunch.py
+++ b/graphene/utils/crunch.py
@@ -3,7 +3,7 @@ import json
 try:
     from collections.abc import Mapping
 except ImportError:
-    from collections import Mapping
+    from collections.abc import Mapping
 
 
 def to_key(value):
diff --git a/graphene/utils/deduplicator.py b/graphene/utils/deduplicator.py
index 57980772..ad0f10e1 100644
--- a/graphene/utils/deduplicator.py
+++ b/graphene/utils/deduplicator.py
@@ -3,7 +3,7 @@ from collections import OrderedDict
 try:
     from collections.abc import Mapping
 except ImportError:
-    from collections import Mapping
+    from collections.abc import Mapping
 
 
 def deflate(node, index=None, path=None):
diff --git a/graphene/utils/deprecated.py b/graphene/utils/deprecated.py
index 2f98d829..32d30209 100644
--- a/graphene/utils/deprecated.py
+++ b/graphene/utils/deprecated.py
@@ -2,7 +2,7 @@ import functools
 import inspect
 import warnings
 
-string_types = (type(b""), type(u""))
+string_types = (bytes, str)
 
 
 def warn_deprecation(text):
@@ -17,7 +17,6 @@ def deprecated(reason):
     """
 
     if isinstance(reason, string_types):
-
         # The @deprecated is used with a 'reason'.
         #
         # .. code-block:: python
@@ -27,7 +26,6 @@ def deprecated(reason):
         #      pass
 
         def decorator(func1):
-
             if inspect.isclass(func1):
                 fmt1 = "Call to deprecated class {name} ({reason})."
             else:
@@ -43,7 +41,6 @@ def deprecated(reason):
         return decorator
 
     elif inspect.isclass(reason) or inspect.isfunction(reason):
-
         # The @deprecated is used without any 'reason'.
         #
         # .. code-block:: python
diff --git a/graphene/utils/orderedtype.py b/graphene/utils/orderedtype.py
index a58f4d08..294ad54e 100644
--- a/graphene/utils/orderedtype.py
+++ b/graphene/utils/orderedtype.py
@@ -2,7 +2,7 @@ from functools import total_ordering
 
 
 @total_ordering
-class OrderedType(object):
+class OrderedType:
     creation_counter = 1
 
     def __init__(self, _creation_counter=None):
@@ -36,4 +36,4 @@ class OrderedType(object):
         return NotImplemented
 
     def __hash__(self):
-        return hash((self.creation_counter))
+        return hash(self.creation_counter)
diff --git a/graphene/utils/props.py b/graphene/utils/props.py
index 5ef3ba0a..26c697ec 100644
--- a/graphene/utils/props.py
+++ b/graphene/utils/props.py
@@ -2,7 +2,7 @@ class _OldClass:
     pass
 
 
-class _NewClass(object):
+class _NewClass:
     pass
 
 
diff --git a/graphene/utils/tests/test_str_converters.py b/graphene/utils/tests/test_str_converters.py
index 786149d9..761ce4ff 100644
--- a/graphene/utils/tests/test_str_converters.py
+++ b/graphene/utils/tests/test_str_converters.py
@@ -1,4 +1,3 @@
-# coding: utf-8
 from ..str_converters import to_camel_case, to_const, to_snake_case
 
 
diff --git a/graphene/utils/tests/test_trim_docstring.py b/graphene/utils/tests/test_trim_docstring.py
index 704d3997..232836d1 100644
--- a/graphene/utils/tests/test_trim_docstring.py
+++ b/graphene/utils/tests/test_trim_docstring.py
@@ -2,7 +2,7 @@ from ..trim_docstring import trim_docstring
 
 
 def test_trim_docstring():
-    class WellDocumentedObject(object):
+    class WellDocumentedObject:
         """
         This object is very well-documented. It has multiple lines in its
         description.
@@ -16,7 +16,7 @@ def test_trim_docstring():
         "description.\n\nMultiple paragraphs too"
     )
 
-    class UndocumentedObject(object):
+    class UndocumentedObject:
         pass
 
     assert trim_docstring(UndocumentedObject.__doc__) is None
diff --git a/graphene/utils/thenables.py b/graphene/utils/thenables.py
index a3089595..8c77ce82 100644
--- a/graphene/utils/thenables.py
+++ b/graphene/utils/thenables.py
@@ -9,7 +9,7 @@ try:
     from promise import Promise, is_thenable  # type: ignore
 except ImportError:
 
-    class Promise(object):  # type: ignore
+    class Promise:  # type: ignore
         pass
 
     def is_thenable(obj):  # type: ignore
diff --git a/tests_asyncio/test_relay_mutation.py b/tests_asyncio/test_relay_mutation.py
index 42ea5fc7..73348bfd 100644
--- a/tests_asyncio/test_relay_mutation.py
+++ b/tests_asyncio/test_relay_mutation.py
@@ -6,7 +6,7 @@ from graphene.types.scalars import String
 from graphene.relay.mutation import ClientIDMutation
 
 
-class SharedFields(object):
+class SharedFields:
     shared = String()