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Note how bytes alias is expected to be used

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Andrew M. Kuchling 2008-10-08 13:21:27 +00:00
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Doc/whatsnew/2.6.rst
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@ -949,6 +949,20 @@ or using a :class:`bytes` constructor. For future compatibility,
Python 2.6 adds :class:`bytes` as a synonym for the :class:`str` type,
and it also supports the ``b''`` notation.
The 2.6 :class:`str` differs from 3.0's :class:`bytes` type in various
ways; most notably, the constructor is completely different. In 3.0,
``bytes([65, 66, 67])`` is 3 elements long, containing the bytes
representing ``ABC``; in 2.6, ``bytes([65, 66, 67])`` returns the
12-byte string representing the :func:`str` of the list.
The primary use of :class:`bytes` in 2.6 will be to write tests of
object type such as ``isinstance(x, bytes)``. This will help the 2to3
converter, which can't tell whether 2.x code intends strings to
contain either characters or 8-bit bytes; you can now
use either :class:`bytes` or :class:`str` to represent your intention
exactly, and the resulting code will also be correct in Python 3.0.
There's also a ``__future__`` import that causes all string literals
to become Unicode strings. This means that ``\u`` escape sequences
can be used to include Unicode characters::