diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 2a5b1ba2..172fc3bf 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -26,4 +26,4 @@ repos:
     rev: 3.7.7
     hooks:
     -   id: flake8
-        exclude: (^docs/.*$|^scripts/generate_ast.py$|test_.*$)
+        exclude: test_.*$
diff --git a/docs/conf.py b/docs/conf.py
index d5c9947c..0e34c364 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -14,7 +14,6 @@
 
 import sys
 import os
-import shlex
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
diff --git a/graphql/backend/__init__.py b/graphql/backend/__init__.py
index 9cd0e198..faeb0033 100644
--- a/graphql/backend/__init__.py
+++ b/graphql/backend/__init__.py
@@ -9,9 +9,6 @@
 from .decider import GraphQLDeciderBackend
 from .cache import GraphQLCachedBackend
 
-# Necessary for static type checking
-if False:  # flake8: noqa
-    from typing import Union
 
 _default_backend = None
 
diff --git a/graphql/backend/cache.py b/graphql/backend/cache.py
index 00680644..f35a45ca 100644
--- a/graphql/backend/cache.py
+++ b/graphql/backend/cache.py
@@ -7,7 +7,7 @@
 
 # Necessary for static type checking
 if False:  # flake8: noqa
-    from typing import Any, Dict, Optional, Union, Tuple, Hashable
+    from typing import Dict, Optional, Hashable
     from .base import GraphQLDocument
 
 _cached_schemas = {}  # type: Dict[GraphQLSchema, str]
diff --git a/graphql/backend/decider.py b/graphql/backend/decider.py
index 3abb3ce5..5fdd39bb 100644
--- a/graphql/backend/decider.py
+++ b/graphql/backend/decider.py
@@ -11,7 +11,7 @@
 
 # Necessary for static type checking
 if False:  # flake8: noqa
-    from typing import List, Union, Any, Optional, Hashable, Dict, Tuple, Type
+    from typing import List, Union, Optional, Hashable, Dict, Tuple, Type
     from ..type.schema import GraphQLSchema
 
 
diff --git a/graphql/error/format_error.py b/graphql/error/format_error.py
index a854095b..e88b1e0e 100644
--- a/graphql/error/format_error.py
+++ b/graphql/error/format_error.py
@@ -2,7 +2,7 @@
 
 # Necessary for static type checking
 if False:  # flake8: noqa
-    from typing import Any, Dict, Union
+    from typing import Any, Dict
 
 
 def format_error(error):
diff --git a/graphql/execution/executors/utils.py b/graphql/execution/executors/utils.py
index 1ba3aaa6..869a81cc 100644
--- a/graphql/execution/executors/utils.py
+++ b/graphql/execution/executors/utils.py
@@ -4,7 +4,7 @@
 if False:  # flake8: noqa
     from ..base import ResolveInfo
     from promise import Promise
-    from typing import Callable, Dict, Tuple, Union, Any
+    from typing import Callable, Dict, Tuple, Any
 
 
 def process(
diff --git a/graphql/execution/middleware.py b/graphql/execution/middleware.py
index be61abda..dd00fd44 100644
--- a/graphql/execution/middleware.py
+++ b/graphql/execution/middleware.py
@@ -2,12 +2,11 @@
 from functools import partial
 from itertools import chain
 
-from promise import Promise, promisify
+from promise import 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
+    from typing import Any, Callable, Iterator, Tuple, Dict, Iterable
 
 MIDDLEWARE_RESOLVER_FUNCTION = "resolve"
 
diff --git a/graphql/language/ast.py b/graphql/language/ast.py
index f7f407ea..0c40d440 100644
--- a/graphql/language/ast.py
+++ b/graphql/language/ast.py
@@ -1,7 +1,7 @@
 # Necessary for static type checking
 if False:  # flake8: noqa
     from .parser import Loc
-    from typing import Any, Optional, Union, List, Tuple, Iterable
+    from typing import Any, Optional, Union, List, Iterable
 
 # This is autogenerated code. DO NOT change this manually.
 # Run scripts/generate_ast.py to generate this file.
diff --git a/graphql/language/printer.py b/graphql/language/printer.py
index d2f27ef8..e540bce5 100644
--- a/graphql/language/printer.py
+++ b/graphql/language/printer.py
@@ -4,45 +4,8 @@
 
 # Necessary for static type checking
 if False:  # flake8: noqa
-    from typing import Any, List, Optional, Union
-    from graphql.language.ast import (
-        Node,
-        Name,
-        Variable,
-        Document,
-        OperationDefinition,
-        VariableDefinition,
-        SelectionSet,
-        Field,
-        Argument,
-        FragmentSpread,
-        InlineFragment,
-        FragmentDefinition,
-        IntValue,
-        StringValue,
-        BooleanValue,
-        EnumValue,
-        ListValue,
-        ObjectValue,
-        ObjectField,
-        Directive,
-        NamedType,
-        ListType,
-        NonNullType,
-        SchemaDefinition,
-        OperationTypeDefinition,
-        ScalarTypeDefinition,
-        ObjectTypeDefinition,
-        FieldDefinition,
-        InputValueDefinition,
-        InterfaceTypeDefinition,
-        UnionTypeDefinition,
-        EnumTypeDefinition,
-        EnumValueDefinition,
-        InputObjectTypeDefinition,
-        TypeExtensionDefinition,
-        DirectiveDefinition,
-    )
+    from typing import Any, List, Optional
+    from graphql.language.ast import Node
 
 __all__ = ["print_ast"]
 
diff --git a/graphql/language/visitor.py b/graphql/language/visitor.py
index 66dded46..42b1a2c9 100644
--- a/graphql/language/visitor.py
+++ b/graphql/language/visitor.py
@@ -9,9 +9,6 @@
 if False:  # flake8: noqa
     from typing import Any, List, Optional, Union, Tuple, Dict
     from ..utils.type_info import TypeInfo
-    from ..validation.validation import UsageVisitor
-    from .ast import Node, Document, OperationDefinition
-    from .printer import PrintingVisitor
 
 
 class _Falsey(object):
@@ -44,7 +41,7 @@ def __init__(self, in_array, index, keys, edits, prev):
 
 
 def visit(root, visitor, key_map=None):
-    # type: (Union[Node, List[Node]], Visitor, Optional[Dict[Node, Tuple]]) -> Any
+    # type: (Union[ast.Node, List[ast.Node]], Visitor, Optional[Dict[ast.Node, Tuple]]) -> Any
     visitor_keys = key_map or QUERY_DOCUMENT_KEYS
 
     stack = None  # type: Optional[Stack]
@@ -52,9 +49,9 @@ def visit(root, visitor, key_map=None):
     keys = [root]
     index = -1
     edits = []  # type: List[Tuple[Union[str, int], Any]]
-    parent = None  # type: Optional[Node]
+    parent = None  # type: Optional[ast.Node]
     path = []  # type: List
-    ancestors = []  # type: List[Node]
+    ancestors = []  # type: List[ast.Node]
     new_root = root
     leave = visitor.leave
     enter = visitor.enter
@@ -214,7 +211,7 @@ def __init__(self, visitors):
         self.visitors = visitors
         self.skipping = [None] * len(
             visitors
-        )  # type: List[Union[Node, _Break, _Falsey, None]]
+        )  # type: List[Union[ast.Node, _Break, _Falsey, None]]
         return None
 
     def enter(
diff --git a/graphql/pyutils/contain_subset.py b/graphql/pyutils/contain_subset.py
index 3b34c621..7c41ea55 100644
--- a/graphql/pyutils/contain_subset.py
+++ b/graphql/pyutils/contain_subset.py
@@ -1,6 +1,6 @@
 # Necessary for static type checking
 if False:  # flake8: noqa
-    from typing import Any, Dict
+    from typing import Any
 
 obj = (dict, list, tuple)
 
diff --git a/graphql/pyutils/default_ordered_dict.py b/graphql/pyutils/default_ordered_dict.py
index 61f8d67c..718b324b 100644
--- a/graphql/pyutils/default_ordered_dict.py
+++ b/graphql/pyutils/default_ordered_dict.py
@@ -3,7 +3,7 @@
 
 # Necessary for static type checking
 if False:  # flake8: noqa
-    from typing import Any, List
+    from typing import Any
 
 
 class DefaultOrderedDict(OrderedDict):
diff --git a/graphql/type/schema.py b/graphql/type/schema.py
index 618a2418..697a8ae9 100644
--- a/graphql/type/schema.py
+++ b/graphql/type/schema.py
@@ -16,7 +16,7 @@
         GraphQLUnionType,
         GraphQLType,
     )
-    from typing import Dict, Union, Any, List, Optional
+    from typing import Dict, Union, List, Optional
 
 
 class GraphQLSchema(object):
diff --git a/graphql/type/typemap.py b/graphql/type/typemap.py
index 62c017f9..427417ca 100644
--- a/graphql/type/typemap.py
+++ b/graphql/type/typemap.py
@@ -18,7 +18,7 @@
 # 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
+    from typing import List, Union, Dict, Set, DefaultDict
 
 
 class GraphQLTypeMap(OrderedDict):
diff --git a/graphql/utils/schema_printer.py b/graphql/utils/schema_printer.py
index 30a28abd..f3193330 100644
--- a/graphql/utils/schema_printer.py
+++ b/graphql/utils/schema_printer.py
@@ -17,7 +17,6 @@
         GraphQLArgument,
         GraphQLType,
         GraphQLField,
-        GraphQLInputObjectField,
         GraphQLEnumValue,
     )
     from ..type.schema import GraphQLSchema
diff --git a/graphql/utils/type_from_ast.py b/graphql/utils/type_from_ast.py
index 1694cfd4..6868c138 100644
--- a/graphql/utils/type_from_ast.py
+++ b/graphql/utils/type_from_ast.py
@@ -6,7 +6,7 @@
     from ..language.ast import ListType, NamedType, NonNullType
     from ..type.definition import GraphQLNamedType
     from ..type.schema import GraphQLSchema
-    from typing import Any, Union
+    from typing import Union
 
 
 def type_from_ast(schema, type_node):
diff --git a/graphql/utils/value_from_ast.py b/graphql/utils/value_from_ast.py
index ff012896..7ad52bca 100644
--- a/graphql/utils/value_from_ast.py
+++ b/graphql/utils/value_from_ast.py
@@ -11,7 +11,7 @@
 if False:  # flake8: noqa
     from ..language.ast import Node
     from ..type.definition import GraphQLType
-    from typing import Any, Dict, Union, Optional, List
+    from typing import Dict, Union, Optional, List
 
 
 def value_from_ast(value_ast, type, variables=None):
diff --git a/graphql/validation/rules/overlapping_fields_can_be_merged.py b/graphql/validation/rules/overlapping_fields_can_be_merged.py
index a46b66f1..f8b01e20 100644
--- a/graphql/validation/rules/overlapping_fields_can_be_merged.py
+++ b/graphql/validation/rules/overlapping_fields_can_be_merged.py
@@ -28,7 +28,7 @@
         InlineFragment,
         SelectionSet,
     )
-    from ...type.definition import GraphQLUnionType, GraphQLField, GraphQLScalarType
+    from ...type.definition import GraphQLField, GraphQLScalarType
     from typing import List, Union, Any, Optional, Dict, Tuple
 
 
diff --git a/graphql/validation/validation.py b/graphql/validation/validation.py
index ba8f28db..1c3948fd 100644
--- a/graphql/validation/validation.py
+++ b/graphql/validation/validation.py
@@ -11,11 +11,8 @@
     from ..error import GraphQLError
     from .rules.base import ValidationRule
     from ..type.definition import (
-        GraphQLList,
         GraphQLObjectType,
-        GraphQLScalarType,
         GraphQLInterfaceType,
-        GraphQLUnionType,
         GraphQLField,
         GraphQLArgument,
         GraphQLType,
diff --git a/scripts/generate_ast.py b/scripts/generate_ast.py
index 06e098a2..2e62a286 100644
--- a/scripts/generate_ast.py
+++ b/scripts/generate_ast.py
@@ -1,3 +1,5 @@
+from casing import snake
+
 if __name__ == "__main__":
     import os.path
     import sys
@@ -14,8 +16,6 @@
         sys.exit(process.wait())
 
 
-from casing import snake
-
 # Fix inconsistencies between libgraphqlparser and graphql-js
 REMAP_TYPES = {"ArrayValue": "ListValue"}
 
diff --git a/tox.ini b/tox.ini
index 242e45a4..4d39ef9b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -37,4 +37,4 @@ commands = sphinx-build -W -b html -d {envtmpdir}/doctrees . {envtmpdir}/html
 [flake8]
 # Must match black formatter default line length
 max-line-length = 88
-ignore = F401,E203,E501,W503,W504
+ignore = E203,E501,W503,W504