diff options
Diffstat (limited to 'Doc/whatsnew/2.7.rst')
| -rw-r--r-- | Doc/whatsnew/2.7.rst | 95 |
1 files changed, 73 insertions, 22 deletions
diff --git a/Doc/whatsnew/2.7.rst b/Doc/whatsnew/2.7.rst index 2814915..be58df3 100644 --- a/Doc/whatsnew/2.7.rst +++ b/Doc/whatsnew/2.7.rst @@ -264,7 +264,9 @@ Some smaller changes made to the core Python language are: Windows, and on Unix platforms using the gcc, icc, or suncc compilers. There may be a small number of platforms where correct operation of this code cannot be guaranteed, so the code is not - used on such systems. + used on such systems. You can find out which code is being used + by checking :data:`sys.float_repr_style`, which will be ``short`` + if the new code is in use and ``legacy`` if it isn't. Implemented by Eric Smith and Mark Dickinson, using David Gay's :file:`dtoa.c` library; :issue:`7117`. @@ -358,6 +360,11 @@ Some smaller changes made to the core Python language are: on the :exc:`IOError` exception when trying to open a directory on POSIX platforms. (Noted by Jan Kaliszewski; :issue:`4764`.) +* The Python tokenizer now translates line endings itself, so the + :func:`compile` built-in function can now accept code using any + line-ending convention. Additionally, it no longer requires that the + code end in a newline. + * Extra parentheses in function definitions are illegal in Python 3.x, meaning that you get a syntax error from ``def f((x)): pass``. In Python3-warning mode, Python 2.7 will now warn about this odd usage. @@ -433,6 +440,8 @@ Several performance enhancements have been added: Various benchmarks show speedups of between 50% and 150% for long integer divisions and modulo operations. (Contributed by Mark Dickinson; :issue:`5512`.) + Bitwise operations are also significantly faster (initial patch by + Gregory Smith; :issue:`1087418`). * The implementation of ``%`` checks for the left-side operand being a Python string and special-cases it; this results in a 1-3% @@ -444,6 +453,16 @@ Several performance enhancements have been added: faster bytecode. (Patch by Antoine Pitrou, back-ported to 2.7 by Jeffrey Yasskin; :issue:`4715`.) +* Converting an integer or long integer to a decimal string was made + faster by special-casing base 10 instead of using a generalized + conversion function that supports arbitrary bases. + (Patch by Gawain Bolton; :issue:`6713`.) + +* The :meth:`rindex`, :meth:`rpartition`, and :meth:`rsplit` methods + of string objects now uses a fast reverse-search algorithm instead of + a character-by-character scan. This is often faster by a factor of 10. + (Added by Florent Xicluna; :issue:`7462`.) + * The :mod:`pickle` and :mod:`cPickle` modules now automatically intern the strings used for attribute names, reducing memory usage of the objects resulting from unpickling. (Contributed by Jake @@ -453,11 +472,6 @@ Several performance enhancements have been added: nearly halving the time required to pickle them. (Contributed by Collin Winter; :issue:`5670`.) -* Converting an integer or long integer to a decimal string was made - faster by special-casing base 10 instead of using a generalized - conversion function that supports arbitrary bases. - (Patch by Gawain Bolton; :issue:`6713`.) - .. ====================================================================== New and Improved Modules @@ -602,6 +616,10 @@ changes, or look through the Subversion logs for all the details. XXX link to file:///MacDev/svn.python.org/python-trunk/Doc/build/html/distutils/examples.html#reading-the-metadata (Contributed by Tarek Ziade; :issue:`7457`.) + :file:`setup.py` files will now accept a :option:`--no-user-cfg` switch + to skip reading the :file:`~/.pydistutils.cfg` file. (Suggested by + by Michael Hoffman, and implemented by Paul Winkler; :issue:`1180`.) + * The :class:`Fraction` class now accepts two rational numbers as arguments to its constructor. (Implemented by Mark Dickinson; :issue:`5812`.) @@ -625,14 +643,6 @@ changes, or look through the Subversion logs for all the details. recorded in a gzipped file by providing an optional timestamp to the constructor. (Contributed by Jacques Frechet; :issue:`4272`.) -* The :mod:`hashlib` module was inconsistent about accepting - input as a Unicode object or an object that doesn't support - the buffer protocol. The behavior was different depending on - whether :mod:`hashlib` was using an external OpenSSL library - or its built-in implementations. Python 2.7 makes the - behavior consistent, always rejecting such objects by raising a - :exc:`TypeError`. (Fixed by Gregory P. Smith; :issue:`3745`.) - * The default :class:`HTTPResponse` class used by the :mod:`httplib` module now supports buffering, resulting in much faster reading of HTTP responses. (Contributed by Kristjan Valur Jonsson; :issue:`4879`.) @@ -745,6 +755,10 @@ changes, or look through the Subversion logs for all the details. to store data. (Contributed by Tarek Ziade; :issue:`6693`.) +* The :mod:`socket` module's :class:`SSL` objects now support the + buffer API, which fixed a test suite failure. (Fixed by Antoine Pitrou; + :issue:`7133`.) + * The :mod:`SocketServer` module's :class:`TCPServer` class now has a :attr:`disable_nagle_algorithm` class attribute. The default value is False; if overridden to be True, @@ -858,6 +872,10 @@ GvR worked on merging them into Python's version of :mod:`unittest`. whether the two values evaluate to the same object or not. (Added by Michael Foord; :issue:`2578`.) +* :meth:`assertIsInstance` and :meth:`assertNotIsInstance` check whether + the resulting object is an instance of a particular class, or of + one of a tuple of classes. (Added by Georg Brandl; :issue:`7031`.) + * :meth:`assertGreater`, :meth:`assertGreaterEqual`, :meth:`assertLess`, and :meth:`assertLessEqual` compare two quantities. @@ -1025,6 +1043,11 @@ Changes to Python's build process and to the C API include: a :ctype:`long`, an *overflow* flag is set and returned to the caller. (Contributed by Case Van Horsen; :issue:`7528`.) +* New function: stemming from the rewrite of string-to-float conversion, + a new :cfunc:`PyOS_string_to_double` function was added. The old + :cfunc:`PyOS_ascii_strtod` and :cfunc:`PyOS_ascii_atof` functions + are now deprecated. + * New macros: the Python header files now define the following macros: :cmacro:`Py_ISALNUM`, :cmacro:`Py_ISALPHA`, @@ -1067,10 +1090,30 @@ Changes to Python's build process and to the C API include: (Fixed by Thomas Wouters; :issue:`1590864`.) +* The :cfunc:`Py_Finalize` function now calls the internal + :func:`threading._shutdown` function; this prevents some exceptions from + being raised when an interpreter shuts down. + (Patch by Adam Olsen; :issue:`1722344`.) + * Global symbols defined by the :mod:`ctypes` module are now prefixed with ``Py``, or with ``_ctypes``. (Implemented by Thomas Heller; :issue:`3102`.) +* New configure option: the :option:`--with-system-expat` switch allows + building the :mod:`pyexpat` module to use the system Expat library. + (Contributed by Arfrever Frehtes Taifersar Arahesis; :issue:`7609`.) + +* New configure option: Compiling Python with the + :option:`--with-valgrind` option will now disable the pymalloc + allocator, which is difficult for the Valgrind to analyze correctly. + Valgrind will therefore be better at detecting memory leaks and + overruns. (Contributed by James Henstridge; :issue:`2422`.) + +* New configure option: you can now supply no arguments to + :option:`--with-dbmliborder=` in order to build none of the various + DBM modules. (Added by Arfrever Frehtes Taifersar Arahesis; + :issue:`6491`.) + * The :program:`configure` script now checks for floating-point rounding bugs on certain 32-bit Intel chips and defines a :cmacro:`X87_DOUBLE_ROUNDING` preprocessor definition. No code currently uses this definition, @@ -1083,11 +1126,6 @@ Changes to Python's build process and to the C API include: * The build process now supports Subversion 1.7. (Contributed by Arfrever Frehtes Taifersar Arahesis; :issue:`6094`.) -* Compiling Python with the :option:`--with-valgrind` option will now - disable the pymalloc allocator, which is difficult for the Valgrind to - analyze correctly. Valgrind will therefore be better at detecting - memory leaks and overruns. (Contributed by James Henstridge; :issue:`2422`.) - .. ====================================================================== @@ -1139,12 +1177,14 @@ Other Changes and Fixes The :option:`-r` option also reports the seed that was used (Added by Collin Winter.) -* The :file:`regrtest.py` script now takes a :option:`-j` switch - that takes an integer specifying how many tests run in parallel. This +* Another :file:`regrtest.py` switch is :option:`-j`, which + takes an integer specifying how many tests run in parallel. This allows reducing the total runtime on multi-core machines. This option is compatible with several other options, including the :option:`-R` switch which is known to produce long runtimes. - (Added by Antoine Pitrou, :issue:`6152`.) + (Added by Antoine Pitrou, :issue:`6152`.) This can also be used + with a new :option:`-F` switch that runs selected tests in a loop + until they fail. (Added by Antoine Pitrou; :issue:`7312`.) .. ====================================================================== @@ -1175,6 +1215,17 @@ that may require changes to your code: nothing when a negative length is requested, as other file-like objects do. (:issue:`7348`). +For C extensions: + +* C extensions that use integer format codes with the ``PyArg_Parse*`` + family of functions will now raise a :exc:`TypeError` exception + instead of triggering a :exc:`DeprecationWarning` (:issue:`5080`). + +* Use the new :cfunc:`PyOS_string_to_double` function instead of the old + :cfunc:`PyOS_ascii_strtod` and :cfunc:`PyOS_ascii_atof` functions, + which are now deprecated. + + .. ====================================================================== |