From 2f6ddd7c7e68db1bbd523c79727655cc45853015 Mon Sep 17 00:00:00 2001
From: Syrus Akbary <me@syrusakbary.com>
Date: Mon, 2 Jul 2018 09:52:28 -0700
Subject: [PATCH] Added comments for if False checks

---
 graphql/backend/__init__.py                                  | 1 +
 graphql/backend/base.py                                      | 1 +
 graphql/backend/cache.py                                     | 1 +
 graphql/backend/compiled.py                                  | 1 +
 graphql/backend/core.py                                      | 1 +
 graphql/backend/decider.py                                   | 1 +
 graphql/error/base.py                                        | 1 +
 graphql/error/format_error.py                                | 1 +
 graphql/error/located_error.py                               | 1 +
 graphql/error/syntax_error.py                                | 1 +
 graphql/error/tests/test_base.py                             | 1 +
 graphql/execution/base.py                                    | 1 +
 graphql/execution/executor.py                                | 1 +
 graphql/execution/executors/asyncio.py                       | 1 +
 graphql/execution/executors/sync.py                          | 1 +
 graphql/execution/executors/thread.py                        | 1 +
 graphql/execution/executors/utils.py                         | 1 +
 graphql/execution/middleware.py                              | 1 +
 graphql/execution/tests/test_nonnull.py                      | 1 +
 graphql/execution/tests/test_subscribe.py                    | 1 +
 graphql/execution/utils.py                                   | 1 +
 graphql/execution/values.py                                  | 1 +
 graphql/graphql.py                                           | 1 +
 graphql/language/ast.py                                      | 1 +
 graphql/language/lexer.py                                    | 1 +
 graphql/language/location.py                                 | 1 +
 graphql/language/parser.py                                   | 1 +
 graphql/language/printer.py                                  | 1 +
 graphql/language/visitor.py                                  | 1 +
 graphql/pyutils/cached_property.py                           | 1 +
 graphql/pyutils/contain_subset.py                            | 1 +
 graphql/pyutils/default_ordered_dict.py                      | 3 ++-
 graphql/pyutils/pair_set.py                                  | 1 +
 graphql/type/definition.py                                   | 1 +
 graphql/type/introspection.py                                | 1 +
 graphql/type/scalars.py                                      | 1 +
 graphql/type/schema.py                                       | 1 +
 graphql/type/typemap.py                                      | 1 +
 graphql/utils/ast_to_code.py                                 | 1 +
 graphql/utils/concat_ast.py                                  | 1 +
 graphql/utils/get_field_def.py                               | 1 +
 graphql/utils/get_operation_ast.py                           | 1 +
 graphql/utils/is_valid_literal_value.py                      | 1 +
 graphql/utils/is_valid_value.py                              | 1 +
 graphql/utils/quoted_or_list.py                              | 1 +
 graphql/utils/schema_printer.py                              | 1 +
 graphql/utils/type_comparators.py                            | 1 +
 graphql/utils/type_from_ast.py                               | 1 +
 graphql/utils/type_info.py                                   | 1 +
 graphql/utils/value_from_ast.py                              | 1 +
 graphql/validation/rules/__init__.py                         | 1 +
 graphql/validation/rules/arguments_of_correct_type.py        | 1 +
 graphql/validation/rules/base.py                             | 1 +
 graphql/validation/rules/default_values_of_correct_type.py   | 1 +
 graphql/validation/rules/fields_on_correct_type.py           | 1 +
 graphql/validation/rules/fragments_on_composite_types.py     | 1 +
 graphql/validation/rules/known_argument_names.py             | 1 +
 graphql/validation/rules/known_type_names.py                 | 1 +
 graphql/validation/rules/lone_anonymous_operation.py         | 1 +
 graphql/validation/rules/no_fragment_cycles.py               | 1 +
 graphql/validation/rules/no_undefined_variables.py           | 1 +
 graphql/validation/rules/no_unused_fragments.py              | 1 +
 graphql/validation/rules/no_unused_variables.py              | 1 +
 graphql/validation/rules/overlapping_fields_can_be_merged.py | 1 +
 graphql/validation/rules/possible_fragment_spreads.py        | 1 +
 graphql/validation/rules/provided_non_null_arguments.py      | 1 +
 graphql/validation/rules/scalar_leafs.py                     | 1 +
 graphql/validation/rules/unique_argument_names.py            | 1 +
 graphql/validation/rules/unique_fragment_names.py            | 1 +
 graphql/validation/rules/unique_input_field_names.py         | 1 +
 graphql/validation/rules/unique_operation_names.py           | 1 +
 graphql/validation/rules/unique_variable_names.py            | 1 +
 graphql/validation/rules/variables_in_allowed_position.py    | 1 +
 graphql/validation/validation.py                             | 1 +
 74 files changed, 75 insertions(+), 1 deletion(-)

diff --git a/graphql/backend/__init__.py b/graphql/backend/__init__.py
index 87e9493e..9cd0e198 100644
--- a/graphql/backend/__init__.py
+++ b/graphql/backend/__init__.py
@@ -9,6 +9,7 @@
 from .decider import GraphQLDeciderBackend
 from .cache import GraphQLCachedBackend
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Union
 
diff --git a/graphql/backend/base.py b/graphql/backend/base.py
index ee6c143e..9d3420b3 100644
--- a/graphql/backend/base.py
+++ b/graphql/backend/base.py
@@ -4,6 +4,7 @@
 from abc import ABCMeta, abstractmethod
 import six
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Dict, Optional, Union, Callable
     from ..language.ast import Document
diff --git a/graphql/backend/cache.py b/graphql/backend/cache.py
index 1ecd1267..f6f0f4a1 100644
--- a/graphql/backend/cache.py
+++ b/graphql/backend/cache.py
@@ -4,6 +4,7 @@
 
 from .base import GraphQLBackend
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Any, Dict, Optional, Union, Tuple, Hashable
     from .base import GraphQLDocument
diff --git a/graphql/backend/compiled.py b/graphql/backend/compiled.py
index 7dc88e50..e3805cd1 100644
--- a/graphql/backend/compiled.py
+++ b/graphql/backend/compiled.py
@@ -1,6 +1,7 @@
 from six import string_types
 from .base import GraphQLDocument
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..type.schema import GraphQLSchema
     from typing import Any, Optional, Dict, Callable, Union
diff --git a/graphql/backend/core.py b/graphql/backend/core.py
index 9368c7de..0d956c15 100644
--- a/graphql/backend/core.py
+++ b/graphql/backend/core.py
@@ -8,6 +8,7 @@
 
 from .base import GraphQLBackend, GraphQLDocument
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Any, Optional, Union
     from .base import GraphQLDocument
diff --git a/graphql/backend/decider.py b/graphql/backend/decider.py
index 6019393c..409b28fa 100644
--- a/graphql/backend/decider.py
+++ b/graphql/backend/decider.py
@@ -1,5 +1,6 @@
 from .base import GraphQLBackend, GraphQLDocument
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import List, Union, Any, Optional
     from ..type.schema import GraphQLSchema
diff --git a/graphql/error/base.py b/graphql/error/base.py
index f84482f2..c57d0959 100644
--- a/graphql/error/base.py
+++ b/graphql/error/base.py
@@ -1,6 +1,7 @@
 import six
 from ..language.location import get_location
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..language.source import Source
     from ..language.location import SourceLocation
diff --git a/graphql/error/format_error.py b/graphql/error/format_error.py
index e60b6f1b..8cdec1ed 100644
--- a/graphql/error/format_error.py
+++ b/graphql/error/format_error.py
@@ -2,6 +2,7 @@
 
 from .base import GraphQLError
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from .base import GraphQLError
     from .located_error import GraphQLLocatedError
diff --git a/graphql/error/located_error.py b/graphql/error/located_error.py
index 06bcccea..fe84e495 100644
--- a/graphql/error/located_error.py
+++ b/graphql/error/located_error.py
@@ -2,6 +2,7 @@
 
 from .base import GraphQLError
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..language.ast import Field
     from typing import List, Union
diff --git a/graphql/error/syntax_error.py b/graphql/error/syntax_error.py
index 4be4a4b4..d38adc1f 100644
--- a/graphql/error/syntax_error.py
+++ b/graphql/error/syntax_error.py
@@ -1,6 +1,7 @@
 from ..language.location import get_location
 from .base import GraphQLError
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..language.source import Source
     from ..language.location import SourceLocation
diff --git a/graphql/error/tests/test_base.py b/graphql/error/tests/test_base.py
index 28d8e2a3..e53f152a 100644
--- a/graphql/error/tests/test_base.py
+++ b/graphql/error/tests/test_base.py
@@ -5,6 +5,7 @@
 from graphql.language.parser import parse
 from graphql.type import GraphQLField, GraphQLObjectType, GraphQLSchema, GraphQLString
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from graphql.execution.base import ResolveInfo
     from typing import Any
diff --git a/graphql/execution/base.py b/graphql/execution/base.py
index 36c42428..47bb71d4 100644
--- a/graphql/execution/base.py
+++ b/graphql/execution/base.py
@@ -12,6 +12,7 @@
 )
 from ..error.format_error import format_error as default_format_error
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Any, Optional, Dict, List, Union
     from ..language.ast import Field, OperationDefinition
diff --git a/graphql/execution/executor.py b/graphql/execution/executor.py
index d4043612..75f2ac95 100644
--- a/graphql/execution/executor.py
+++ b/graphql/execution/executor.py
@@ -35,6 +35,7 @@
 from .executors.sync import SyncExecutor
 from .middleware import MiddlewareManager
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Any, Optional, Union, Dict, List, Callable
     from rx import Observable
diff --git a/graphql/execution/executors/asyncio.py b/graphql/execution/executors/asyncio.py
index 8dc183eb..bafa492b 100644
--- a/graphql/execution/executors/asyncio.py
+++ b/graphql/execution/executors/asyncio.py
@@ -4,6 +4,7 @@
 
 from promise import Promise
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from asyncio.unix_events import _UnixSelectorEventLoop
     from typing import Optional, Any, Callable, List
diff --git a/graphql/execution/executors/sync.py b/graphql/execution/executors/sync.py
index df8aabb6..c45d8a8f 100644
--- a/graphql/execution/executors/sync.py
+++ b/graphql/execution/executors/sync.py
@@ -1,3 +1,4 @@
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Any, Callable
 
diff --git a/graphql/execution/executors/thread.py b/graphql/execution/executors/thread.py
index 1544ec98..f540a1a0 100644
--- a/graphql/execution/executors/thread.py
+++ b/graphql/execution/executors/thread.py
@@ -4,6 +4,7 @@
 from promise import Promise
 from .utils import process
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Any, Callable, List
 
diff --git a/graphql/execution/executors/utils.py b/graphql/execution/executors/utils.py
index d710e4c7..1ba3aaa6 100644
--- a/graphql/execution/executors/utils.py
+++ b/graphql/execution/executors/utils.py
@@ -1,5 +1,6 @@
 from sys import exc_info
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..base import ResolveInfo
     from promise import Promise
diff --git a/graphql/execution/middleware.py b/graphql/execution/middleware.py
index 97cbec11..be61abda 100644
--- a/graphql/execution/middleware.py
+++ b/graphql/execution/middleware.py
@@ -4,6 +4,7 @@
 
 from promise import Promise, promisify
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from .base import ResolveInfo
     from typing import Any, Callable, Iterator, Tuple, Union, List, Dict, Iterable
diff --git a/graphql/execution/tests/test_nonnull.py b/graphql/execution/tests/test_nonnull.py
index ebd1e844..6f8a3725 100644
--- a/graphql/execution/tests/test_nonnull.py
+++ b/graphql/execution/tests/test_nonnull.py
@@ -12,6 +12,7 @@
 
 from .utils import rejected, resolved
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from promise import Promise
     from typing import Any, Optional, Dict, Tuple, Union
diff --git a/graphql/execution/tests/test_subscribe.py b/graphql/execution/tests/test_subscribe.py
index f6ad3f34..2fa039c3 100644
--- a/graphql/execution/tests/test_subscribe.py
+++ b/graphql/execution/tests/test_subscribe.py
@@ -15,6 +15,7 @@
     subscribe,
 )
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from graphql.execution.base import ResolveInfo
     from rx import Observable
diff --git a/graphql/execution/utils.py b/graphql/execution/utils.py
index a44cd503..a942c729 100644
--- a/graphql/execution/utils.py
+++ b/graphql/execution/utils.py
@@ -15,6 +15,7 @@
 from ..utils.type_from_ast import type_from_ast
 from .values import get_argument_values, get_variable_values
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..type.definition import GraphQLObjectType, GraphQLField
     from ..type.schema import GraphQLSchema
diff --git a/graphql/execution/values.py b/graphql/execution/values.py
index c1a20f22..18388b4b 100644
--- a/graphql/execution/values.py
+++ b/graphql/execution/values.py
@@ -18,6 +18,7 @@
 from ..utils.type_from_ast import type_from_ast
 from ..utils.value_from_ast import value_from_ast
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..language.ast import VariableDefinition, Argument
     from ..type.schema import GraphQLSchema
diff --git a/graphql/graphql.py b/graphql/graphql.py
index f7c394b7..7e22be53 100644
--- a/graphql/graphql.py
+++ b/graphql/graphql.py
@@ -3,6 +3,7 @@
 
 from promise import promisify
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from rx import Observable
     from typing import Any, Union, Optional
diff --git a/graphql/language/ast.py b/graphql/language/ast.py
index a05072d3..f7f407ea 100644
--- a/graphql/language/ast.py
+++ b/graphql/language/ast.py
@@ -1,3 +1,4 @@
+# Necessary for static type checking
 if False:  # flake8: noqa
     from .parser import Loc
     from typing import Any, Optional, Union, List, Tuple, Iterable
diff --git a/graphql/language/lexer.py b/graphql/language/lexer.py
index ce4f3179..a60bc6e2 100644
--- a/graphql/language/lexer.py
+++ b/graphql/language/lexer.py
@@ -4,6 +4,7 @@
 
 from ..error import GraphQLSyntaxError
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Optional, Any, List
     from .source import Source
diff --git a/graphql/language/location.py b/graphql/language/location.py
index 6cf48f50..71c19bd9 100644
--- a/graphql/language/location.py
+++ b/graphql/language/location.py
@@ -1,3 +1,4 @@
+# Necessary for static type checking
 if False:  # flake8: noqa
     from .source import Source
     from typing import Any
diff --git a/graphql/language/parser.py b/graphql/language/parser.py
index f8a20b84..8b658e50 100644
--- a/graphql/language/parser.py
+++ b/graphql/language/parser.py
@@ -5,6 +5,7 @@
 from .lexer import Lexer, TokenKind, get_token_desc, get_token_kind_desc
 from .source import Source
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Dict, Union, Any, Optional, Callable, List
     from ..error.syntax_error import GraphQLSyntaxError
diff --git a/graphql/language/printer.py b/graphql/language/printer.py
index 02e15ee9..d2f27ef8 100644
--- a/graphql/language/printer.py
+++ b/graphql/language/printer.py
@@ -2,6 +2,7 @@
 
 from .visitor import Visitor, visit
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Any, List, Optional, Union
     from graphql.language.ast import (
diff --git a/graphql/language/visitor.py b/graphql/language/visitor.py
index c2a7bbac..66dded46 100644
--- a/graphql/language/visitor.py
+++ b/graphql/language/visitor.py
@@ -5,6 +5,7 @@
 from . import ast
 from .visitor_meta import QUERY_DOCUMENT_KEYS, VisitorMeta
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Any, List, Optional, Union, Tuple, Dict
     from ..utils.type_info import TypeInfo
diff --git a/graphql/pyutils/cached_property.py b/graphql/pyutils/cached_property.py
index 119b9e2a..c17a4dbe 100644
--- a/graphql/pyutils/cached_property.py
+++ b/graphql/pyutils/cached_property.py
@@ -1,3 +1,4 @@
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Any
 
diff --git a/graphql/pyutils/contain_subset.py b/graphql/pyutils/contain_subset.py
index da3aea78..3b34c621 100644
--- a/graphql/pyutils/contain_subset.py
+++ b/graphql/pyutils/contain_subset.py
@@ -1,3 +1,4 @@
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Any, Dict
 
diff --git a/graphql/pyutils/default_ordered_dict.py b/graphql/pyutils/default_ordered_dict.py
index 83a0b307..2408cb43 100644
--- a/graphql/pyutils/default_ordered_dict.py
+++ b/graphql/pyutils/default_ordered_dict.py
@@ -1,6 +1,7 @@
 import copy
 from collections import OrderedDict
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Any, List
 
@@ -18,7 +19,7 @@ def __init__(self, default_factory=None, *a, **kw):
         self.default_factory = default_factory
 
     def __missing__(self, key):
-        # type: (str) -> List
+        # type: (str) -> Any
         if self.default_factory is None:
             raise KeyError(key)
         self[key] = value = self.default_factory()
diff --git a/graphql/pyutils/pair_set.py b/graphql/pyutils/pair_set.py
index 9b369a4c..e7b18ebb 100644
--- a/graphql/pyutils/pair_set.py
+++ b/graphql/pyutils/pair_set.py
@@ -1,3 +1,4 @@
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Dict, Any
 
diff --git a/graphql/type/definition.py b/graphql/type/definition.py
index 2aba9352..9099242e 100644
--- a/graphql/type/definition.py
+++ b/graphql/type/definition.py
@@ -7,6 +7,7 @@
 from ..utils.assert_valid_name import assert_valid_name
 from ..utils.undefined import Undefined
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import List, Dict, Any, Callable, Optional, Union, Type
 
diff --git a/graphql/type/introspection.py b/graphql/type/introspection.py
index 1f5d1292..520011f2 100644
--- a/graphql/type/introspection.py
+++ b/graphql/type/introspection.py
@@ -18,6 +18,7 @@
 from .directives import DirectiveLocation
 from .scalars import GraphQLBoolean, GraphQLString
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..execution.base import ResolveInfo
     from .definition import GraphQLInputObjectField
diff --git a/graphql/type/scalars.py b/graphql/type/scalars.py
index 0169e825..137cf279 100644
--- a/graphql/type/scalars.py
+++ b/graphql/type/scalars.py
@@ -3,6 +3,7 @@
 from ..language.ast import BooleanValue, FloatValue, IntValue, StringValue
 from .definition import GraphQLScalarType
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Any, Optional, Union
 
diff --git a/graphql/type/schema.py b/graphql/type/schema.py
index 54e0a09f..3fe84659 100644
--- a/graphql/type/schema.py
+++ b/graphql/type/schema.py
@@ -5,6 +5,7 @@
 from .introspection import IntrospectionSchema
 from .typemap import GraphQLTypeMap
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from .definition import (
         GraphQLNamedType,
diff --git a/graphql/type/typemap.py b/graphql/type/typemap.py
index 146bd129..f492b7de 100644
--- a/graphql/type/typemap.py
+++ b/graphql/type/typemap.py
@@ -15,6 +15,7 @@
     is_output_type,
 )
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..type.definition import GraphQLNamedType
     from typing import Any, List, Optional, Union, Dict, Set, Mapping, DefaultDict
diff --git a/graphql/utils/ast_to_code.py b/graphql/utils/ast_to_code.py
index 2db01b35..07b8068b 100644
--- a/graphql/utils/ast_to_code.py
+++ b/graphql/utils/ast_to_code.py
@@ -1,6 +1,7 @@
 from ..language.ast import Node
 from ..language.parser import Loc
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Any
 
diff --git a/graphql/utils/concat_ast.py b/graphql/utils/concat_ast.py
index 8685bbc0..1f5cfdc0 100644
--- a/graphql/utils/concat_ast.py
+++ b/graphql/utils/concat_ast.py
@@ -2,6 +2,7 @@
 
 from ..language.ast import Document
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Iterable
 
diff --git a/graphql/utils/get_field_def.py b/graphql/utils/get_field_def.py
index 5b06973f..b690fbfb 100644
--- a/graphql/utils/get_field_def.py
+++ b/graphql/utils/get_field_def.py
@@ -5,6 +5,7 @@
     TypeNameMetaFieldDef,
 )
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..language.ast import Field
     from ..type.definition import GraphQLField, GraphQLInterfaceType, GraphQLObjectType
diff --git a/graphql/utils/get_operation_ast.py b/graphql/utils/get_operation_ast.py
index 56dccd4e..cd5ba26d 100644
--- a/graphql/utils/get_operation_ast.py
+++ b/graphql/utils/get_operation_ast.py
@@ -1,5 +1,6 @@
 from ..language import ast
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..language.ast import Document, OperationDefinition
     from typing import Optional
diff --git a/graphql/utils/is_valid_literal_value.py b/graphql/utils/is_valid_literal_value.py
index 9e99d587..0949e6f4 100644
--- a/graphql/utils/is_valid_literal_value.py
+++ b/graphql/utils/is_valid_literal_value.py
@@ -8,6 +8,7 @@
     GraphQLScalarType,
 )
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..language.ast import ObjectValue, StringValue
     from ..type.definition import GraphQLInputObjectType, GraphQLScalarType
diff --git a/graphql/utils/is_valid_value.py b/graphql/utils/is_valid_value.py
index 2dd83bfc..8b403c94 100644
--- a/graphql/utils/is_valid_value.py
+++ b/graphql/utils/is_valid_value.py
@@ -15,6 +15,7 @@
     GraphQLScalarType,
 )
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import Any, List
 
diff --git a/graphql/utils/quoted_or_list.py b/graphql/utils/quoted_or_list.py
index c968b73f..8931cec1 100644
--- a/graphql/utils/quoted_or_list.py
+++ b/graphql/utils/quoted_or_list.py
@@ -1,5 +1,6 @@
 import functools
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import List
 
diff --git a/graphql/utils/schema_printer.py b/graphql/utils/schema_printer.py
index 5fe2df68..30a28abd 100644
--- a/graphql/utils/schema_printer.py
+++ b/graphql/utils/schema_printer.py
@@ -11,6 +11,7 @@
 from .ast_from_value import ast_from_value
 
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..type.definition import (
         GraphQLArgument,
diff --git a/graphql/utils/type_comparators.py b/graphql/utils/type_comparators.py
index 4789df26..ba8867e1 100644
--- a/graphql/utils/type_comparators.py
+++ b/graphql/utils/type_comparators.py
@@ -7,6 +7,7 @@
     is_abstract_type,
 )
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..type.definition import (
         GraphQLScalarType,
diff --git a/graphql/utils/type_from_ast.py b/graphql/utils/type_from_ast.py
index c76a2d28..1694cfd4 100644
--- a/graphql/utils/type_from_ast.py
+++ b/graphql/utils/type_from_ast.py
@@ -1,6 +1,7 @@
 from ..language import ast
 from ..type.definition import GraphQLList, GraphQLNonNull
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..language.ast import ListType, NamedType, NonNullType
     from ..type.definition import GraphQLNamedType
diff --git a/graphql/utils/type_info.py b/graphql/utils/type_info.py
index 6a17de9b..76433eb6 100644
--- a/graphql/utils/type_info.py
+++ b/graphql/utils/type_info.py
@@ -11,6 +11,7 @@
 from .get_field_def import get_field_def
 from .type_from_ast import type_from_ast
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..type.schema import GraphQLSchema
     from ..type.definition import (
diff --git a/graphql/utils/value_from_ast.py b/graphql/utils/value_from_ast.py
index f8a78c70..ff012896 100644
--- a/graphql/utils/value_from_ast.py
+++ b/graphql/utils/value_from_ast.py
@@ -7,6 +7,7 @@
     GraphQLScalarType,
 )
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..language.ast import Node
     from ..type.definition import GraphQLType
diff --git a/graphql/validation/rules/__init__.py b/graphql/validation/rules/__init__.py
index e9f19cbf..056a530d 100644
--- a/graphql/validation/rules/__init__.py
+++ b/graphql/validation/rules/__init__.py
@@ -23,6 +23,7 @@
 from .variables_are_input_types import VariablesAreInputTypes
 from .variables_in_allowed_position import VariablesInAllowedPosition
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import List, Type
     from .base import ValidationRule
diff --git a/graphql/validation/rules/arguments_of_correct_type.py b/graphql/validation/rules/arguments_of_correct_type.py
index d9d7d950..7b9f87d3 100644
--- a/graphql/validation/rules/arguments_of_correct_type.py
+++ b/graphql/validation/rules/arguments_of_correct_type.py
@@ -3,6 +3,7 @@
 from ...utils.is_valid_literal_value import is_valid_literal_value
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ...language.ast import Argument
     from typing import Any, List, Union
diff --git a/graphql/validation/rules/base.py b/graphql/validation/rules/base.py
index 821dd747..53541c9c 100644
--- a/graphql/validation/rules/base.py
+++ b/graphql/validation/rules/base.py
@@ -1,5 +1,6 @@
 from ...language.visitor import Visitor
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..validation import ValidationContext
 
diff --git a/graphql/validation/rules/default_values_of_correct_type.py b/graphql/validation/rules/default_values_of_correct_type.py
index d09500c4..d35c0872 100644
--- a/graphql/validation/rules/default_values_of_correct_type.py
+++ b/graphql/validation/rules/default_values_of_correct_type.py
@@ -4,6 +4,7 @@
 from ...utils.is_valid_literal_value import is_valid_literal_value
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ...language.ast import Document, OperationDefinition, SelectionSet
     from typing import List, Union
diff --git a/graphql/validation/rules/fields_on_correct_type.py b/graphql/validation/rules/fields_on_correct_type.py
index 03a68984..fdcec447 100644
--- a/graphql/validation/rules/fields_on_correct_type.py
+++ b/graphql/validation/rules/fields_on_correct_type.py
@@ -7,6 +7,7 @@
 from ...utils.suggestion_list import suggestion_list
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ...language.ast import Field, InlineFragment
     from typing import Any, List, Union
diff --git a/graphql/validation/rules/fragments_on_composite_types.py b/graphql/validation/rules/fragments_on_composite_types.py
index e775b700..33324b40 100644
--- a/graphql/validation/rules/fragments_on_composite_types.py
+++ b/graphql/validation/rules/fragments_on_composite_types.py
@@ -3,6 +3,7 @@
 from ...type.definition import is_composite_type
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ...language.ast import Field, InlineFragment
     from typing import Any, List, Union
diff --git a/graphql/validation/rules/known_argument_names.py b/graphql/validation/rules/known_argument_names.py
index e7b4839a..96966a8c 100644
--- a/graphql/validation/rules/known_argument_names.py
+++ b/graphql/validation/rules/known_argument_names.py
@@ -4,6 +4,7 @@
 from ...utils.suggestion_list import suggestion_list
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ...language.ast import Argument
     from typing import Any, List, Union
diff --git a/graphql/validation/rules/known_type_names.py b/graphql/validation/rules/known_type_names.py
index b0a95aeb..4c68c27b 100644
--- a/graphql/validation/rules/known_type_names.py
+++ b/graphql/validation/rules/known_type_names.py
@@ -3,6 +3,7 @@
 from ...utils.suggestion_list import suggestion_list
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ...language.ast import NamedType
     from typing import Any
diff --git a/graphql/validation/rules/lone_anonymous_operation.py b/graphql/validation/rules/lone_anonymous_operation.py
index 89c480f6..51b1ae23 100644
--- a/graphql/validation/rules/lone_anonymous_operation.py
+++ b/graphql/validation/rules/lone_anonymous_operation.py
@@ -2,6 +2,7 @@
 from ...language import ast
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..validation import ValidationContext
     from ...language.ast import Document, OperationDefinition
diff --git a/graphql/validation/rules/no_fragment_cycles.py b/graphql/validation/rules/no_fragment_cycles.py
index f9a85a1f..e3cc06b0 100644
--- a/graphql/validation/rules/no_fragment_cycles.py
+++ b/graphql/validation/rules/no_fragment_cycles.py
@@ -1,6 +1,7 @@
 from ...error import GraphQLError
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..validation import ValidationContext
     from ...language.ast import Document, OperationDefinition, FragmentSpread
diff --git a/graphql/validation/rules/no_undefined_variables.py b/graphql/validation/rules/no_undefined_variables.py
index 8a9ed3d3..59df5bb0 100644
--- a/graphql/validation/rules/no_undefined_variables.py
+++ b/graphql/validation/rules/no_undefined_variables.py
@@ -1,6 +1,7 @@
 from ...error import GraphQLError
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..validation import ValidationContext
     from ...language.ast import Document, OperationDefinition
diff --git a/graphql/validation/rules/no_unused_fragments.py b/graphql/validation/rules/no_unused_fragments.py
index e8d2dfc1..320a0c4a 100644
--- a/graphql/validation/rules/no_unused_fragments.py
+++ b/graphql/validation/rules/no_unused_fragments.py
@@ -1,6 +1,7 @@
 from ...error import GraphQLError
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..validation import ValidationContext
     from ...language.ast import Document, OperationDefinition, FragmentDefinition
diff --git a/graphql/validation/rules/no_unused_variables.py b/graphql/validation/rules/no_unused_variables.py
index 65b50337..49b81faf 100644
--- a/graphql/validation/rules/no_unused_variables.py
+++ b/graphql/validation/rules/no_unused_variables.py
@@ -1,6 +1,7 @@
 from ...error import GraphQLError
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..validation import ValidationContext
     from ...language.ast import Document, OperationDefinition, VariableDefinition
diff --git a/graphql/validation/rules/overlapping_fields_can_be_merged.py b/graphql/validation/rules/overlapping_fields_can_be_merged.py
index ae8ee6c5..8506e2cd 100644
--- a/graphql/validation/rules/overlapping_fields_can_be_merged.py
+++ b/graphql/validation/rules/overlapping_fields_can_be_merged.py
@@ -17,6 +17,7 @@
 from ...utils.type_from_ast import type_from_ast
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..validation import ValidationContext
     from ...language.ast import (
diff --git a/graphql/validation/rules/possible_fragment_spreads.py b/graphql/validation/rules/possible_fragment_spreads.py
index d8bf329c..460d9191 100644
--- a/graphql/validation/rules/possible_fragment_spreads.py
+++ b/graphql/validation/rules/possible_fragment_spreads.py
@@ -3,6 +3,7 @@
 from ...utils.type_from_ast import type_from_ast
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ...language.ast import Field, InlineFragment
     from typing import Any, List, Union
diff --git a/graphql/validation/rules/provided_non_null_arguments.py b/graphql/validation/rules/provided_non_null_arguments.py
index 5558fd6d..bfdbabe8 100644
--- a/graphql/validation/rules/provided_non_null_arguments.py
+++ b/graphql/validation/rules/provided_non_null_arguments.py
@@ -2,6 +2,7 @@
 from ...type.definition import GraphQLNonNull
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ...language.ast import Field, InlineFragment
     from typing import Any, List, Optional, Union
diff --git a/graphql/validation/rules/scalar_leafs.py b/graphql/validation/rules/scalar_leafs.py
index 76d25a24..a36c4e8d 100644
--- a/graphql/validation/rules/scalar_leafs.py
+++ b/graphql/validation/rules/scalar_leafs.py
@@ -2,6 +2,7 @@
 from ...type.definition import get_named_type, is_leaf_type
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ...language.ast import Field, InlineFragment
     from typing import Any, List, Union
diff --git a/graphql/validation/rules/unique_argument_names.py b/graphql/validation/rules/unique_argument_names.py
index e59a5f85..4f7cefc1 100644
--- a/graphql/validation/rules/unique_argument_names.py
+++ b/graphql/validation/rules/unique_argument_names.py
@@ -1,6 +1,7 @@
 from ...error import GraphQLError
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..validation import ValidationContext
     from ...language.ast import Field, InlineFragment, Argument, Name
diff --git a/graphql/validation/rules/unique_fragment_names.py b/graphql/validation/rules/unique_fragment_names.py
index cc67f8a4..aa7fa5ba 100644
--- a/graphql/validation/rules/unique_fragment_names.py
+++ b/graphql/validation/rules/unique_fragment_names.py
@@ -1,6 +1,7 @@
 from ...error import GraphQLError
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..validation import ValidationContext
     from ...language.ast import Document, OperationDefinition, Name
diff --git a/graphql/validation/rules/unique_input_field_names.py b/graphql/validation/rules/unique_input_field_names.py
index dde35ec9..b0e64077 100644
--- a/graphql/validation/rules/unique_input_field_names.py
+++ b/graphql/validation/rules/unique_input_field_names.py
@@ -1,6 +1,7 @@
 from ...error import GraphQLError
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..validation import ValidationContext
     from ...language.ast import Argument, ObjectValue, ObjectField, Name
diff --git a/graphql/validation/rules/unique_operation_names.py b/graphql/validation/rules/unique_operation_names.py
index d44d6ee2..f7546595 100644
--- a/graphql/validation/rules/unique_operation_names.py
+++ b/graphql/validation/rules/unique_operation_names.py
@@ -1,6 +1,7 @@
 from ...error import GraphQLError
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..validation import ValidationContext
     from ...language.ast import Document, OperationDefinition, Name
diff --git a/graphql/validation/rules/unique_variable_names.py b/graphql/validation/rules/unique_variable_names.py
index 425d43f4..6d7bfcbf 100644
--- a/graphql/validation/rules/unique_variable_names.py
+++ b/graphql/validation/rules/unique_variable_names.py
@@ -1,6 +1,7 @@
 from ...error import GraphQLError
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..validation import ValidationContext
     from ...language.ast import Document, OperationDefinition
diff --git a/graphql/validation/rules/variables_in_allowed_position.py b/graphql/validation/rules/variables_in_allowed_position.py
index 5bdd5da5..8a0209d1 100644
--- a/graphql/validation/rules/variables_in_allowed_position.py
+++ b/graphql/validation/rules/variables_in_allowed_position.py
@@ -4,6 +4,7 @@
 from ...utils.type_from_ast import type_from_ast
 from .base import ValidationRule
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from ..validation import ValidationContext
     from ...language.ast import Document, OperationDefinition, VariableDefinition
diff --git a/graphql/validation/validation.py b/graphql/validation/validation.py
index 9422ad56..ed647742 100644
--- a/graphql/validation/validation.py
+++ b/graphql/validation/validation.py
@@ -4,6 +4,7 @@
 from ..utils.type_info import TypeInfo
 from .rules import specified_rules
 
+# Necessary for static type checking
 if False:  # flake8: noqa
     from typing import List, Union, Optional, Dict, Set, Any, Type
     from ..language.ast import Document, OperationDefinition, SelectionSet, Node