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I'm tired -- checking in more news items. This isn't complete; I'm
about halfways.
This commit is contained in:
parent
8a81d27d58
commit
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335
Misc/NEWS
335
Misc/NEWS
|
@ -3,19 +3,37 @@ What's new in this release?
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Below is a partial list of changes. This list is much more detailed than
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previous; however it is still not complete. I did go through my CVS logs
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but ran out of time. I believe that at least all major changes are
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actually noted here. Note that I have not placed
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but ran out of time. Some changes made beteen Oct 1996 and April 1997
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have not yet been noted.
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Miscellaneous
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-------------
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- The default module search path is now much saner. Both on Unix and
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Windows, it is essentially derived from the path to the executable which
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can be overridden by setting the environment variable $PYTHONHOME). The
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value of $PYTHONPATH on Windows is now inserted in front of the default
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path, like in Unix (instead of overriding the default path). On Windows,
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the directory containing the executable is added to the end of the path.
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- The default module search path is now much saner. Both on Unix and
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Windows, it is essentially derived from the path to the executable
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(which can be overridden by setting the environment variable
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$PYTHONHOME). The value of $PYTHONPATH on Windows is now inserted in
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front of the default path, like in Unix (instead of overriding the
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default path). On Windows, the directory containing the executable is
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added to the end of the path.
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- On Unix, when using sys.argv[0] to insert the script directory in
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front of sys.path, expand a symbolic link. You can now install a
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program in a private directory and have a symbolic link to it in a
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public bin directory, and it will put the private directory in the
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module search path. Note that the symlink is expanded in sys.path[0]
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but not in sys.argv[0], so you can still tell the name by which you
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were invoked.
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- It is now recommended to use ``#!/usr/bin/env python'' instead of
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``#!/usr/local/bin/python'' at the start of executable scripts, except
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for CGI scripts. It has been determined that the use of /usr/bin/env
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is more portable than that of /usr/local/bin/python -- scripts almost
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never have to be edited when the Python interpreter lives in a
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non-standard place. Note that this doesn't work for CGI scripts since
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the python executable often doesn't live in the HTTP server's default
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search path.
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- The silly -s command line option and the corresponding
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PYTHONSUPPRESS environment variable (and the Py_SuppressPrint global
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@ -30,6 +48,20 @@ when using the debugger or profiler (reported by Just van Rossum).
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The simplest example is ``def f((a,b),(c,d)): print a,b,c,d''; this
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would print the wrong value when run under the debugger or profiler.
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- The sort() methods for lists no longer uses the C library qsort(); I
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wrote my own quicksort implementation, with help from Tim Peters.
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This solves a bug in dictionary comparisons on some Solaris versions
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when Python is built with threads, and makes sorting lists even
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faster.
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- The hacks that the dictionary implementation used to speed up
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repeated lookups of the same C string were removed; these were a
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source of subtle problems and don't seem to serve much of a purpose
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any longer.
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- All traces of support for the long dead access statement have been
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removed from the sources.
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- Plugged the two-byte memory leak in the tokenizer when reading an
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interactive EOF.
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@ -37,7 +69,8 @@ interactive EOF.
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Performance
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-----------
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- It's much faster (almost twice for pystone.py -- see Tools/scripts).
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- It's much faster (almost twice for pystone.py -- see
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Tools/scripts). See the entry on string interning below.
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- Some speedup by using separate free lists for method objects (both
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the C and the Python variety) and for floating point numbers.
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@ -52,6 +85,12 @@ types (e.g. i+i, i-i, and list[i]). Fredrik Lundh.
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- Small speedup by reordering the method tables of some common
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objects (e.g. list.append is now first).
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- Big optimization to the read() method of file objects. A read()
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without arguments now attempts to use fstat to allocate a buffer of
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the right size; for pipes and sockets, it will fall back to doubling
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the buffer size. While that the improvement is real on all systems,
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it is most dramatic on Windows.
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Documentation
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-------------
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@ -96,25 +135,34 @@ consisting of a backslash and a quote. (Raw strings are also
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affectionately known as Robin strings, after their inventor, Robin
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Friedrich.)
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- There's a simple assert statement, and a new exception AssertionError.
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For example, ``assert foo > 0'' is equivalent to ``if not foo > 0: raise
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AssertionError''. Sorry, the text of the asserted condition is not
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available; it would be too generate code for this. However, the text is
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displayed as part of the traceback! There's also a -O option to the
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interpreter that removes SET_LINENO instructions, assert statements; it
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uses and produces .pyo files instead of .pyc files. In the future it
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should be possible to write external bytecode optimizers that create better
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optimized .pyo files. Without -O, the assert statement actually generates
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code that first checks __debug__; if this variable is false, the assertion
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is not checked. __debug__ is a built-in variable whose value is
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initialized to track the -O flag (it's true iff -O is not specified). With
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-O, no code is generated for assert statements, nor for code of the form
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``if __debug__: <something>''. Sorry, no further constant folding happens.
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- There's a simple assert statement, and a new exception
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AssertionError. For example, ``assert foo > 0'' is equivalent to ``if
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not foo > 0: raise AssertionError''. Sorry, the text of the asserted
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condition is not available; it would be too generate code for this.
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However, the text is displayed as part of the traceback! There's also
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a -O option to the interpreter that removes SET_LINENO instructions,
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assert statements; it uses and produces .pyo files instead of .pyc
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files (the line numbers are still available in the .pyo file, as a
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separate table; but the removal of the SET_LINENO instructions means
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that the debugger can't set breakpoints on lines in -O mode). In the
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future it should be possible to write external bytecode optimizers
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that create better optimized .pyo files. Without -O, the assert
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statement actually generates code that first checks __debug__; if this
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variable is false, the assertion is not checked. __debug__ is a
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built-in variable whose value is initialized to track the -O flag
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(it's true iff -O is not specified). With -O, no code is generated
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for assert statements, nor for code of the form ``if __debug__:
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<something>''. Sorry, no further constant folding happens.
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Changes to builtin features
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---------------------------
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- There's a new exception FloatingPointError (used only by Lee Busby's
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patches to catch floating point exceptions, at the moment).
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- The obsolete exception ConflictError has been deleted.
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- There's a new function sys.exc_info() which returns the tuple
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(sys.exc_type, sys.exc_value, sys.exc_traceback) in a thread-safe way.
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@ -153,15 +201,14 @@ dictionary d into this one, overriding existing keys. BTW, the
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dictionary implementation file is now called dictobject.c rather than
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the confusing mappingobject.c.
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- The sort() methods for lists no longer uses the C library qsort(); I
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wrote my own quicksort implementation, with help from Tim Peters.
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This solves a bug in dictionary comparisons on some Solaris versions
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when Python is built with threads, and makes sorting lists even
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faster.
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- The intrinsic function dir() is much smarter; it looks in __dict__,
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__members__ and __methods__.
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- The intrinsic functions int(), long() and float() can now take a
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string argument and then do the same thing as string.atoi(),
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string.atol(), and string.atof(). No second 'base' argument is
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allowed, and complex() does not take a string (nobody cared enough).
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- When a module is deleted, its globals are now deleted in two phases.
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In the first phase, all variables whose name begins with exactly one
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underscore are replaced by None; in the second phase, all variables
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@ -181,6 +228,12 @@ class. Jim Fulton will love it -- it also works with instances of his
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"extension classes", since it is triggered by the presence of a
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__class__ attribute on the purported base class.
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- New optional parameter to the readlines() method of file objects.
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This indicates the number of bytes to read (the actual number of bytes
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read will be somewhat larger due to buffering reading until the end of
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the line). Some optimizations have also been made to speed it up (but
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not as much as read()).
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New extension modules
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---------------------
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@ -189,8 +242,9 @@ New extension modules
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Fulton and other folks at Digital Creations. These are much more
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efficient than their Python counterparts StringIO.py and pickle.py,
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but don't support subclassing. cPickle.c clocks up to 1000 times
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faster than pickle.py. The pickle.py module has been updated to make
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it compatible with the new binary format that cPickle.c produces (by
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faster than pickle.py; cStringIO.c's improvement is less dramatic but
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still significant. The pickle.py module has been updated to make it
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compatible with the new binary format that cPickle.c produces (by
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default it produces the old all-ASCII format compatible with the old
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pickle.py, still much faster than pickle.py; it can read both
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formats). A new helper module, copy_reg.py, is provided to register
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@ -231,6 +285,10 @@ database is still open before making any new calls.
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- Various modules now export their type object: socket.SocketType,
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array.ArrayType.
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- The socket module's accept() method now returns unknown addresses as
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a tuple rather than raising an exception. (This can happen in
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promiscuous mode.) Theres' also a new function getprotobyname().
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- The pthread support for the thread module now works on most platforms.
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- STDWIN is now officially obsolete. Support for it will eventually
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@ -239,6 +297,26 @@ be removed from the distribution.
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- The binascii extension module is now hopefully fully debugged. (XXX
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Oops -- Fredril Lundh promised me a fix that I never received.)
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- audioop.c: added a ratecv method
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- posixmodule.c: now exports the O_* flags (O_APPEND etc.). On
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Windows, also O_TEXT and O_BINARY. The 'error' variable (the
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exception is raises) is renamed -- its string value is now "os.error",
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so newbies don't believe they have to import posix (or nt) to catch
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it when they see os.error reported as posix.error.
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- A new version of the al (audio library) module for SGI was
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contributed by Sjoerd Mullender.
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- The regex module has a new function get_syntax() which retrieves the
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syntax setting set by set_syntax(). The code was also sanitized,
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removing worries about unclean error handling. See also below for its
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successor, re.py.
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- The "new" module (which creates new objects of various types) once
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again has a fully functioning new.function() method. Dangerous as
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ever!
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New library modules
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-------------------
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@ -298,7 +376,8 @@ cgi scripts more easily outside an http server. There's an optional
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limit to the size of uploads to POST (Skip Montanaro). Added a
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'strict_parsing' option to all parsing functions (Jim Fulton). The
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function parse_qs() now uses urllib.unquote() on the name as well as
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the value of fields (Clarence Gardner).
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the value of fields (Clarence Gardner). The FieldStorage class now
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has a __len__() method.
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- httplib.py: the socket object is no longer closed; all HTTP/1.*
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versions are now treated the same; and it is now thread-safe (by not
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@ -310,7 +389,8 @@ using the regex module).
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access to the standard error stream and the process id of the
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subprocess possible.
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- Added timezone support to the rfc822.py module; also added
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- Added timezone support to the rfc822.py module, in the form of a
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getdate_tz() method and a parsedate_tz() function. Also added
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recognition of some non-standard date formats, by Lars Wirzenius.
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- mhlib.py: various enhancements, including almost compatible parsing
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@ -325,16 +405,24 @@ Wirzenius.) (Of course, you should be using cStringIO for performance.)
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- Improvements for whrandom.py by Tim Peters: use 32-bit arithmetic to
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speed it up, and replace 0 seed values by 1 to avoid degeneration.
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- Module ftplib.py: added support for parsing a .netrc file. Fred
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Drake.
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- Module ftplib.py: added support for parsing a .netrc file (Fred
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Drake). Also added an ntransfercmd() method to the FTP class, which
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allows access to the expected size of a transfer when available, and a
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parse150() function to the module which parses the corresponding 150
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response.
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- urllib.py: the ftp cache is now limited to 10 entries. Added
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quote_plus() method which is like qupte() but also replaces spaces
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with '+', for encoding CGI form arguments. Catch all errors from the
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ftp module. HTTP requests now add the Host: header line. The proxy
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variable names are now mapped to lower case, for Windows.
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variable names are now mapped to lower case, for Windows. The
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spliturl() function no longer erroneously throws away all data past
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the first newline. The basejoin() function now intereprets "../"
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correctly.
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- shelve.py: use cPickle and cStringIO when available.
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- shelve.py: use cPickle and cStringIO when available. Also added
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a sync() method, which calls the database's sync() method if there is
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one.
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- The mimetools.py module now uses the available Python modules for
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decoding quoted-printable, uuencode and base64 formats, rather than
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@ -356,6 +444,35 @@ is set to 20 (not 2000 as it was in earlier alphas).
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includes functions to handle the funny encoding you sometimes see in mail
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headers. It is now documented.
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- mailbox.py: Added BabylMailbox. Improved the way the mailbox is
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gotten from the environment.
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- Many more modules now correctly open files in binary mode when this
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is necessary on non-Unix platforms.
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- The copying functions in the undocumented module shutil.py are
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smarter.
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- The Writer classes in the formatter.py module now have a flush()
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method.
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- The Python bytecode disassembler module, dis.py, has been enhanced
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quite a bit. There's now one main function, dis.dis(), which takes
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almost any kind of object (function, module, class, instance, method,
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code object) and disassembles it; without arguments it disassembles
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the last frame of the last traceback. The other functions have
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changed slightly, too.
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- The imghdr.py module recognizes new image types: BMP, PNG.
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- The string module has a new function replace(str, old, new,
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[maxsplit]) which does substring replacements. It is actually
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implemented in C in the strop module. The functions [r]find() an
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[r]index() have an optional 4th argument indicating the end of the
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substring to search, alsoo implemented by their strop counterparts.
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(Remember, never import strop -- import string uses strop when
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available with zero overhead.)
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Changes to the build process
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----------------------------
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@ -408,9 +525,17 @@ of always adding one byte to all malloc() arguments on most platforms.
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Change to the Python/C API
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--------------------------
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- I've completed the Grand Renaming, with the help of Roger Masse and Barry
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Warsaw. This makes reading or debugging the code much easier. Many other
|
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unrelated code reorganizations have also been carried out.
|
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- I've completed the Grand Renaming, with the help of Roger Masse and
|
||||
Barry Warsaw. This makes reading or debugging the code much easier.
|
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Many other unrelated code reorganizations have also been carried out.
|
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The allobjects.h header file is gone; instead, you would have to
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include Python.h followed by rename2.h. But you're better off running
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Tools/scripts/fixcid.py -s Misc/RENAME on your source, so you can omit
|
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the rename2.h; it will disappear in the next release.
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|
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- The API functions in the file cgensupport.c are no longer
|
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supported. This file has been moved to Modules and is only ever
|
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compiled when the SGI specific 'gl' module is built.
|
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|
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- PyObject_Compare() can now raise an exception. Check with
|
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PyErr_Occurred(). The comparison function in an object type may also
|
||||
|
@ -435,10 +560,10 @@ The old, half-hearted Py_Cleanup() routine is gone. Use of Py_Exit()
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is deprecated (it is nothing more than Py_Finalize() followed by
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||||
exit()).
|
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|
||||
- There are no known memory leaks. While Py_Finalize() doesn't free
|
||||
*all* allocated memory (some of it is hard to track down), repeated
|
||||
calls to Py_Finalize() and Py_Initialize() do not create unaccessible
|
||||
heap blocks.
|
||||
- There are no known memory leaks left. While Py_Finalize() doesn't
|
||||
free *all* allocated memory (some of it is hard to track down),
|
||||
repeated calls to Py_Finalize() and Py_Initialize() do not create
|
||||
unaccessible heap blocks.
|
||||
|
||||
- There is now explicit per-thread state. (Inspired by, but not the
|
||||
same as, Greg Stein's free threading patches.)
|
||||
|
@ -477,14 +602,28 @@ PyErr_Occurred() to check (there is *no* special return value).
|
|||
instead of clearing exceptions. This fixes an obscure bug where using
|
||||
these would clear a pending exception, discovered by Just van Rossum.
|
||||
|
||||
- PyArg_GetInt() is gone.
|
||||
|
||||
- It's no longer necessary to include graminit.h when calling one of
|
||||
the extended parser API functions. The three public grammar start
|
||||
symbols are now in Python.h as Py_single_input, Py_file_input, and
|
||||
Py_eval_input.
|
||||
|
||||
|
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Tkinter
|
||||
-------
|
||||
|
||||
- New standard dialog modules for Tkinter: tkColorChooser.py,
|
||||
tkCommonDialog.py, tkMessageBox.py, tkFileDialog.py, tkSimpleDialog.py
|
||||
These interface with the new Tk dialog scripts. Contributed by
|
||||
Fredrik Lundh.
|
||||
- On popular demand, _tkinter once again installs a hook for readline
|
||||
that processes certain Tk events while waiting for the user to type
|
||||
(using PyOS_InputHook).
|
||||
|
||||
- A patch by Craig McPheeters plugs the most obnoxious memory leaks,
|
||||
caused by command definitions referencing widget objects beyond their
|
||||
lifetime.
|
||||
|
||||
- New standard dialog modules: tkColorChooser.py, tkCommonDialog.py,
|
||||
tkMessageBox.py, tkFileDialog.py, tkSimpleDialog.py These interface
|
||||
with the new Tk dialog scripts. Contributed by Fredrik Lundh.
|
||||
|
||||
- Tkinter.py: when the first Tk object is destroyed, it sets the
|
||||
hiddel global _default_root to None, so that when another Tk object is
|
||||
|
@ -541,9 +680,11 @@ extension makefile (Misc/Makefile.pre.in).
|
|||
|
||||
- Tools/scripts/h2py.py now supports C++ comments.
|
||||
|
||||
- The pystone.py script is upgraded to version 1.1; there was a bug in
|
||||
version 1.0 (distributed with Python 1.4) that leaked memory. Also,
|
||||
in 1.1, the LOOPS variable is incremented to 10000.
|
||||
- Tools/scripts/pystone.py script is upgraded to version 1.1; there
|
||||
was a bug in version 1.0 (distributed with Python 1.4) that leaked
|
||||
memory. Also, in 1.1, the LOOPS variable is incremented to 10000.
|
||||
|
||||
- Demo/classes/Rat.py completely rewritten by Sjoerd Mullender.
|
||||
|
||||
|
||||
Windows (NT and 95)
|
||||
|
@ -576,82 +717,64 @@ expansion in expanduser().
|
|||
|
||||
- The freeze tool now works on Windows.
|
||||
|
||||
- See also the Tkinter category for a note on _tkinter.createfilehandler().
|
||||
- See also the Tkinter category for a sad note on
|
||||
_tkinter.createfilehandler().
|
||||
|
||||
- The truncate() method for file objects now works on Windows.
|
||||
|
||||
- Py_Initialize() is no longer called when the DLL is loaded. You
|
||||
must call it yourself. (And you can't call it twice -- it's a fatal
|
||||
error to call it when Python is already initialized.)
|
||||
|
||||
|
||||
Mac
|
||||
---
|
||||
|
||||
- As always, the Macintosh port was done by Jack Jansen. See his
|
||||
separate announcement for the Mac specific source code and the binary
|
||||
distribution(s).
|
||||
- As always, the Macintosh port will be done by Jack Jansen. He will
|
||||
make a separate announcement for the Mac specific source code and the
|
||||
binary distribution(s) when these are ready.
|
||||
|
||||
|
||||
More
|
||||
----
|
||||
Fixed after 1.5a3 was released
|
||||
------------------------------
|
||||
|
||||
The following items should be expanded upon:
|
||||
The following changes have been made to the source base after the
|
||||
release of 1.5a3. These need to be merged into their respective
|
||||
categories for the next release.
|
||||
|
||||
- formatter.*Writer.flush
|
||||
- regrtest.py is slightly more verbose, printing the name of each test
|
||||
as it runs them.
|
||||
|
||||
- dis.{cmp_op, hascompare}
|
||||
- fileobject.c: ftell() on Linux discards all buffered data; changed
|
||||
read() code to use lseek() instead
|
||||
|
||||
- ftplib: FTP.ntransfercmd, parse150
|
||||
- configure.in, configure, importdl.c: NeXT sharedlib fixes
|
||||
|
||||
- imghdr recognizes bmp, png
|
||||
- tupleobject.c: PyTuple_SetItem asserts refcnt==1
|
||||
|
||||
- mimify base64 support
|
||||
- resource.c: Change how and when to declare getpagesize() and
|
||||
getrlimit()
|
||||
|
||||
- new.function revived
|
||||
- mpzmodule.c: CPP hack to support GMP 1.x for real
|
||||
|
||||
- cgi.FieldStorage: __len__ added
|
||||
- importdl.c, configure*: set sharedlib extensions properly for NeXT
|
||||
|
||||
New exceptions:
|
||||
FloatingPointError
|
||||
Deleted exception:
|
||||
ConflictError
|
||||
- configure*, Makefile.in, Modules/Makefile.pre.in: AIX shared libraries
|
||||
fixed; moved addition of PURIFY to LINKCC to configure
|
||||
|
||||
> audioop.ratecv
|
||||
- reopmodule.c, regexmodule.c, regexpr.c, zlibmodule.c: casts to shut
|
||||
up Mac compiler
|
||||
|
||||
> posix.O_APPEND
|
||||
> posix.O_CREAT
|
||||
> posix.O_DSYNC
|
||||
> posix.O_EXCL
|
||||
> posix.O_NDELAY
|
||||
> posix.O_NOCTTY
|
||||
> posix.O_NONBLOCK
|
||||
> posix.O_RDONLY
|
||||
> posix.O_RDWR
|
||||
> posix.O_RSYNC
|
||||
> posix.O_SYNC
|
||||
> posix.O_TRUNC
|
||||
> posix.O_WRONLY
|
||||
posix.O_TEXT
|
||||
posix.O_BINARY
|
||||
(also in os, of course)
|
||||
- _tkinter.c: removed buggy mac #ifndef
|
||||
|
||||
> regex.get_syntax
|
||||
- Doc: various Mac documentation changes, added docs for 'ic' module
|
||||
|
||||
> socket.getprotobyname
|
||||
- PC/make_nt.in: deleted
|
||||
|
||||
> strop.replace
|
||||
Also string.replace
|
||||
- test_time.py, test_strftime.py: tweaks to catch %Z
|
||||
|
||||
- Jack's buffer interface!
|
||||
- supported by regex module!
|
||||
- test_rotor.py: print b -> print `b`
|
||||
|
||||
- posix.error, nt.error renamed to os.error
|
||||
- Tkinter.py: (tagOrId) -> (tagOrId,)
|
||||
|
||||
- rfc822 getdate_tz and parsedate_tz
|
||||
|
||||
- shelve.*.sync
|
||||
|
||||
- shutil improved interface
|
||||
|
||||
- socket.getprotobynameo
|
||||
|
||||
- new al module for SGI
|
||||
|
||||
Obsolete: cgensupport.[ch] are now in Modules and only linked with glmodule.c.
|
||||
|
||||
- much faster file.read() and readlines() on windows
|
||||
- faqwiz.py: Recognize https:// as URL
|
||||
|
|
Loading…
Reference in a new issue