[Python-checkins] cpython: What's New in Python 3.5: add pep 461 (bytes%args) and 465 (a at b)

[victor.stinner]

https://hg.python.org/cpython/rev/00c982c9f681
changeset:   95297:00c982c9f681
user:        Victor Stinner <victor.stinner at gmail.com>
date:        Mon Mar 30 15:04:45 2015 +0200
summary:
  What's New in Python 3.5: add pep 461 (bytes%args) and 465 (a at b)

files:
  Doc/whatsnew/3.5.rst |  45 +++++++++++++++++++++++++++++--
  1 files changed, 42 insertions(+), 3 deletions(-)


diff --git a/Doc/whatsnew/3.5.rst b/Doc/whatsnew/3.5.rst
--- a/Doc/whatsnew/3.5.rst
+++ b/Doc/whatsnew/3.5.rst
@@ -64,12 +64,12 @@
 Summary -- Release highlights
 =============================
 
-.. This section singles out the most important changes in Python 3.3.
+.. This section singles out the most important changes in Python 3.5.
    Brevity is key.
 
 New syntax features:
 
-* None yet.
+*  :pep:`465`, a new matrix multiplication operator: ``a @ b``.
 
 New library modules:
 
@@ -78,7 +78,8 @@
 
 New built-in features:
 
-* None yet.
+* ``bytes % args``, ``bytearray % args``: :pep:`461` - Adding ``%`` formatting
+  to bytes and bytearray
 
 Implementation improvements:
 
@@ -114,6 +115,44 @@
        PEP written by Carl Meyer
 
 
+PEP 461 - Adding % formatting to bytes and bytearray
+----------------------------------------------------
+
+This PEP proposes adding % formatting operations similar to Python 2's ``str``
+type to :class:`bytes` and :class:`bytearray`.
+
+Examples::
+
+    >>> b'Hello %s!' % b'World'
+    b'Hello World!'
+    >>> b'x=%i y=%f' % (1, 2.5)
+    b'x=1 y=2.500000'
+
+Unicode is not allowed for ``%s``, but it is accepted by ``%a`` (equivalent of
+``repr(obj).encode('ascii', 'backslashreplace')``)::
+
+    >>> b'Hello %s!' % 'World'
+    Traceback (most recent call last):
+      File "<stdin>", line 1, in <module>
+    TypeError: %b requires bytes, or an object that implements __bytes__, not 'str'
+    >>> b'price: %a' % '10€'
+    b"price: '10\\u20ac'"
+
+.. seealso::
+
+   :pep:`461` -- Adding % formatting to bytes and bytearray
+
+
+PEP 465 - A dedicated infix operator for matrix multiplication
+--------------------------------------------------------------
+
+This PEP proposes a new binary operator to be used for matrix multiplication,
+called ``@``. (Mnemonic: ``@`` is ``*`` for mATrices.)
+
+.. seealso::
+
+   :pep:`465` -- A dedicated infix operator for matrix multiplication
+
 
 PEP 471 - os.scandir() function -- a better and faster directory iterator
 -------------------------------------------------------------------------

-- 
Repository URL: https://hg.python.org/cpython