apply black and isort (#4287)

* apply black and isort

* move some type ignores

stdlib/3/ast.pyi

@@ -9,6 +9,7 @@
 import sys
 import typing as _typing
 from typing import Any, Iterator, Optional, TypeVar, Union, overload
+
 from typing_extensions import Literal
 
 from _ast import *  # type: ignore
@@ -19,6 +20,7 @@ if sys.version_info >= (3, 8):
     class Bytes(Constant): ...
     class NameConstant(Constant): ...
     class Ellipsis(Constant): ...
+
 if sys.version_info >= (3, 9):
     class slice(AST): ...
     class ExtSlice(slice): ...
@@ -180,16 +182,23 @@ if sys.version_info >= (3, 9):
     def unparse(ast_obj: AST) -> str: ...
 
 def copy_location(new_node: _T, old_node: AST) -> _T: ...
+
 if sys.version_info >= (3, 9):
-    def dump(node: AST, annotate_fields: bool = ..., include_attributes: bool = ..., *, indent: Union[int, str, None] = ...) -> str: ...
+    def dump(
+        node: AST, annotate_fields: bool = ..., include_attributes: bool = ..., *, indent: Union[int, str, None] = ...
+    ) -> str: ...
+
 else:
     def dump(node: AST, annotate_fields: bool = ..., include_attributes: bool = ...) -> str: ...
+
 def fix_missing_locations(node: _T) -> _T: ...
 def get_docstring(node: AST, clean: bool = ...) -> str: ...
 def increment_lineno(node: _T, n: int = ...) -> _T: ...
 def iter_child_nodes(node: AST) -> Iterator[AST]: ...
 def iter_fields(node: AST) -> Iterator[_typing.Tuple[str, Any]]: ...
 def literal_eval(node_or_string: Union[str, AST]) -> Any: ...
+
 if sys.version_info >= (3, 8):
     def get_source_segment(source: str, node: AST, *, padded: bool = ...) -> Optional[str]: ...
+
 def walk(node: AST) -> Iterator[AST]: ...