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Batuhan Osman TASKAYA
cpython
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ed9e6447
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ed9e6447
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Eki 09, 2000
tarafından
Jeremy Hylton
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Summary of changes between 2.0b2 and 2.0c1
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ed9e6447
What's New in Python 2.0
b2
?
What's New in Python 2.0
c1
?
===========================
Below is a list of all relevant changes since release 1.6. Older
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@@ -14,6 +14,129 @@ http://starship.python.net/crew/amk/python/writing/new-python/.
======================================================================
What's new in 2.0 release candidate 1 (since beta 2)?
=====================================================
All the changes since the last beta release are bug fixes or changes
to build support for specific platforms.
Core language, builtins, and interpreter
- A bug that caused crashes when __coerce__ was used with augmented
assignment, e.g. +=, was fixed.
- Raise ZeroDivisionError when raising zero to a negative number,
e.g. 0.0 ** -2.0. Note that math.pow is unrelated to the builtin
power operator and the result of math.pow(0.0, -2.0) will vary by
platform. On Linux, it raises a ValueError.
- A bug in Unicode string interpolation was fixed that occasionally
caused errors with formats including "%%". For example, the
following expression "%% %s" % u"abc" no longer raises a TypeError.
- Compilation of deeply nested expressions raises MemoryError instead
of SyntaxError, e.g. eval("[" * 50 + "]" * 50).
- In 2.0b2 on Windows, the interpreter wrote .pyc files in text mode,
rendering them useless. They are now written in binary mode again.
Standard library
- Keyword arguments are now accepted for most pattern and match object
methods in SRE, the standard regular expression engine.
- In SRE, fix error with negative lookahead and lookbehind that
manifested itself as a runtime error in patterns like "?<!abc)(def)".
- Tkinter now supports Unicode strings and will set a Python exception
when an error occurs handling a specific Unicode string.
- Fix memory management errors in Merge() and Tkapp_Call() routines.
- Several changes were made to cStringIO to make it compatible with
the file-like object interface and with StringIO. If operations are
performed on a closed object, an exception is raised. The truncate
method now accepts a position argument and readline accepts a size
argument.
- There were many changes made to the linuxaudiodev module and its
test suite; as a result, a short, unexpected audio sample should now
play when the regression test is run.
Note that this module is named poorly, because it should work
correctly on any platform that supports the Open Sound System
(OSS).
The module now raises exceptions when errors occur instead of
crashing. It also defines the AFMT_A_LAW format (logarithmic A-law
audio) and defines a getptr() method that calls the
SNDCTL_DSP_GETxPTR ioctl defined in the OSS Programmer's Guide.
- The library_version attribute, introduced in an earlier beta, was
removed because it can not be supported with early versions of the C
readline library, which provides no way to determine the version at
compile-time.
- The binascii module is now enabled on Win64.
Internals
- Fix several buffer overflow vulnerabilities in calculate_path(),
which is called when the interpreter starts up to determine where
the standard library is installed. These vulnerabilities affect all
previous versions of Python and can be exploited by setting very
long values for PYTHONHOME or argv[0]. The risk is greatest for a
setuid Python script, although use of the wrapper in
Misc/setuid-prog.c will eliminate the vulnerability.
- Fixed garbage collection bugs in instance creation that were
triggered when errors occurred during initialization. The solution,
applied in cPickle and in PyInstance_New(), is to call
PyObject_GC_Init() after the initialization of the object's
container attributes is complete.
- pyexpat adds definitions of PyModule_AddStringConstant and
PyModule_AddObject if the Python version is less than 2.0, which
provides compatibility with PyXML on Python 1.5.2.
- If the platform has a bogus definition for LONG_BIT (the number of
bits in a long), an error will be reported at compile time.
- Fix bugs in _PyTuple_Resize() which caused hard-to-interpret garbage
collection crashes and possibly other, unreported crashes.
- Fixed a memory leak in _PyUnicode_Fini().
Build issues
- configure now accepts a --with-suffix option that specifies the
executable. This is useful for builds on Cygwin and Mac OS X, for
example.
- The mmap.PAGESIZE constant is now initialized using sysconf when
possible, which eliminates a dependency on -lucb for Reliant UNIX.
- The md5 file should now compile on all platforms.
- The select module now compiles on platforms that do not define
POLLRDNORM and related constants.
- Darwin (Mac OS X): Initial support for static builds on this
platform.
- BeOS: Many changes were made to support compilation on BeOS 4.5 and
5.0.
- Cygwin: Support for shared libraries, Tkinter, and sockets.
- SunOS 4.1.4_JL: Fix test for directory existence in configure.
Tools and other miscellany
- Removed debugging prints from main used with freeze.
- IDLE auto-indent internals no longer crashes when it encounters
Unicode characters in the range 128 to 255.
What's new in 2.0 beta 2 (since beta 1)?
========================================
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