apply black and isort (#4287)

* apply black and isort

* move some type ignores

stdlib/2/io.pyi

@@ -5,36 +5,40 @@
 # Only a subset of functionality is included.
 
 from typing import IO, Any, Union
+
 import _io
+from _io import (
+    DEFAULT_BUFFER_SIZE as DEFAULT_BUFFER_SIZE,
+    BlockingIOError as BlockingIOError,
+    BufferedRandom as BufferedRandom,
+    BufferedReader as BufferedReader,
+    BufferedRWPair as BufferedRWPair,
+    BufferedWriter as BufferedWriter,
+    BytesIO as BytesIO,
+    FileIO as FileIO,
+    IncrementalNewlineDecoder as IncrementalNewlineDecoder,
+    StringIO as StringIO,
+    TextIOWrapper as TextIOWrapper,
+    UnsupportedOperation as UnsupportedOperation,
+    open as open,
+)
 
-from _io import BlockingIOError as BlockingIOError
-from _io import BufferedRWPair as BufferedRWPair
-from _io import BufferedRandom as BufferedRandom
-from _io import BufferedReader as BufferedReader
-from _io import BufferedWriter as BufferedWriter
-from _io import BytesIO as BytesIO
-from _io import DEFAULT_BUFFER_SIZE as DEFAULT_BUFFER_SIZE
-from _io import FileIO as FileIO
-from _io import IncrementalNewlineDecoder as IncrementalNewlineDecoder
-from _io import StringIO as StringIO
-from _io import TextIOWrapper as TextIOWrapper
-from _io import UnsupportedOperation as UnsupportedOperation
-from _io import open as open
-
-def _OpenWrapper(file: Union[str, unicode, int],
-                 mode: unicode = ..., buffering: int = ..., encoding: unicode = ...,
-                 errors: unicode = ..., newline: unicode = ...,
-                 closefd: bool = ...) -> IO[Any]: ...
+def _OpenWrapper(
+    file: Union[str, unicode, int],
+    mode: unicode = ...,
+    buffering: int = ...,
+    encoding: unicode = ...,
+    errors: unicode = ...,
+    newline: unicode = ...,
+    closefd: bool = ...,
+) -> IO[Any]: ...
 
 SEEK_SET: int
 SEEK_CUR: int
 SEEK_END: int
 
-
 class IOBase(_io._IOBase): ...
-
 class RawIOBase(_io._RawIOBase, IOBase): ...
-
 class BufferedIOBase(_io._BufferedIOBase, IOBase): ...
 
 # Note: In the actual io.py, TextIOBase subclasses IOBase.