diff between py2 and 2and3

gistfile1.txt

$ diff stdlib/2/codecs.pyi stdlib/2and3/codecs.pyi 
2c2
< # https://docs.python.org/2/library/codecs.html
---
> # https://docs.python.org/2/library/codecs.html and https://docs.python.org/3/library/codecs.html
9d8
<     Optional,
18c17
< # str is the raw form and unicode is the cooked form.
---
> # bytes (py2 str) is the raw form and str (py2 unicode) is the cooked form.
20,24c19,28
< # There *are* str->str and unicode->unicode encodings in the standard library.
< # And unlike python 3, they are in fairly widespread use.
< 
< _decoded = unicode
< _encoded = str
---
> # There *are* bytes->bytes and str->str encodings in the standard library.
> # They are much more common in Python 2 than in Python 3.
> # Python 3.5 supposedly might change something there.
> 
> if sys.version_info >= (3, 0):
>     _decoded = str
>     _encoded = bytes
> else:
>     _decoded = unicode
>     _encoded = str
44d47
<     def __init__(self, encode: _encode_type, decode: _decode_type, streamreader: _stream_reader_type = ..., streamwriter: _stream_writer_type = ..., incrementalencoder: _incremental_encoder_type = ..., incrementaldecoder: _incremental_decoder_type = ..., name: str = ...) -> None: ...
51a55
>     def __init__(self, encode: _encode_type, decode: _decode_type, streamreader: _stream_reader_type = ..., streamwriter: _stream_writer_type = ..., incrementalencoder: _incremental_encoder_type = ..., incrementaldecoder: _incremental_decoder_type = ..., name: str = ...) -> None: ...
72c76
< def EncodedFile(file: BinaryIO, data_encoding: str, file_encoding: str = ..., errors: Optional[str] = ...) -> 'StreamRecoder':
---
> def EncodedFile(file: BinaryIO, data_encoding: str, file_encoding: str = ..., errors: str = ...) -> 'StreamRecoder':
158c162
<     buffer = ...  # type: str
---
>     buffer = ...  # type: bytes
196c200
<     def __enter__(self) -> BinaryIO:
---
>     def __enter__(self) -> StreamReaderWriter: