diff options
Diffstat (limited to 'Doc/whatsnew/3.0.rst')
| -rw-r--r-- | Doc/whatsnew/3.0.rst | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/Doc/whatsnew/3.0.rst b/Doc/whatsnew/3.0.rst index b7f7233..852f811 100644 --- a/Doc/whatsnew/3.0.rst +++ b/Doc/whatsnew/3.0.rst @@ -96,9 +96,9 @@ up if you're used to Python 2.5. Print Is A Function ------------------- -The :keyword:`print` statement has been replaced with a :func:`print` +The ``print`` statement has been replaced with a :func:`print` function, with keyword arguments to replace most of the special syntax -of the old :keyword:`print` statement (:pep:`3105`). Examples:: +of the old ``print`` statement (:pep:`3105`). Examples:: Old: print "The answer is", 2*2 New: print("The answer is", 2*2) @@ -126,7 +126,7 @@ which produces:: Note: * The :func:`print` function doesn't support the "softspace" feature of - the old :keyword:`print` statement. For example, in Python 2.x, + the old ``print`` statement. For example, in Python 2.x, ``print "A\n", "B"`` would write ``"A\nB\n"``; but in Python 3.0, ``print("A\n", "B")`` writes ``"A\n B\n"``. @@ -135,7 +135,7 @@ Note: ``print(x)`` instead! * When using the ``2to3`` source-to-source conversion tool, all - :keyword:`print` statements are automatically converted to + ``print`` statements are automatically converted to :func:`print` function calls, so this is mostly a non-issue for larger projects. @@ -178,7 +178,7 @@ Python 3.0 has simplified the rules for ordering comparisons: meaningful natural ordering. Thus, expressions like ``1 < ''``, ``0 > None`` or ``len <= len`` are no longer valid, and e.g. ``None < None`` raises :exc:`TypeError` instead of returning - :keyword:`False`. A corollary is that sorting a heterogeneous list + ``False``. A corollary is that sorting a heterogeneous list no longer makes sense -- all the elements must be comparable to each other. Note that this does not apply to the ``==`` and ``!=`` operators: objects of different incomparable types always compare @@ -397,9 +397,8 @@ Changed Syntax * :keyword:`as` and :keyword:`with` are now reserved words. (Since 2.6, actually.) -* :keyword:`True`, :keyword:`False`, and :keyword:`None` are reserved - words. (2.6 partially enforced the restrictions on :keyword:`None` - already.) +* ``True``, ``False``, and ``None`` are reserved words. (2.6 partially enforced + the restrictions on ``None`` already.) * Change from :keyword:`except` *exc*, *var* to :keyword:`except` *exc* :keyword:`as` *var*. See :pep:`3110`. @@ -906,7 +905,7 @@ best strategy is the following: It is not recommended to try to write source code that runs unchanged under both Python 2.6 and 3.0; you'd have to use a very contorted -coding style, e.g. avoiding :keyword:`print` statements, metaclasses, +coding style, e.g. avoiding ``print`` statements, metaclasses, and much more. If you are maintaining a library that needs to support both Python 2.6 and Python 3.0, the best approach is to modify step 3 above by editing the 2.6 version of the source code and running the |