Merged revisions 53304-53433,53435-53450 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r53304 | vinay.sajip | 2007-01-09 15:50:28 +0100 (Tue, 09 Jan 2007) | 1 line

  Bug #1627575: Added _open() method to FileHandler which can be used to reopen files. The FileHandler instance now saves the encoding (which can be None) in an attribute called "encoding".
........
  r53305 | vinay.sajip | 2007-01-09 15:51:36 +0100 (Tue, 09 Jan 2007) | 1 line

  Added entry about addition of _open() method to logging.FileHandler.
........
  r53306 | vinay.sajip | 2007-01-09 15:54:56 +0100 (Tue, 09 Jan 2007) | 1 line

  Added a docstring
........
  r53316 | thomas.heller | 2007-01-09 20:19:33 +0100 (Tue, 09 Jan 2007) | 4 lines

  Verify the sizes of the basic ctypes data types against the struct
  module.

  Will backport to release25-maint.
........
  r53340 | gustavo.niemeyer | 2007-01-10 17:13:40 +0100 (Wed, 10 Jan 2007) | 3 lines

  Mention in the int() docstring that a base zero has meaning, as
  stated in http://docs.python.org/lib/built-in-funcs.html as well.
........
  r53341 | gustavo.niemeyer | 2007-01-10 17:15:48 +0100 (Wed, 10 Jan 2007) | 2 lines

  Minor change in int() docstring for proper spacing.
........
  r53358 | thomas.heller | 2007-01-10 21:12:13 +0100 (Wed, 10 Jan 2007) | 1 line

  Change the ctypes version number to "1.1.0".
........
  r53361 | thomas.heller | 2007-01-10 21:51:19 +0100 (Wed, 10 Jan 2007) | 1 line

  Must change the version number in the _ctypes extension as well.
........
  r53362 | guido.van.rossum | 2007-01-11 00:12:56 +0100 (Thu, 11 Jan 2007) | 3 lines

  Fix the signature of log_error().  (A subclass that did the right thing
  was getting complaints from pychecker.)
........
  r53370 | matthias.klose | 2007-01-11 11:26:31 +0100 (Thu, 11 Jan 2007) | 2 lines

  - Make the documentation match the code and the docstring
........
  r53375 | matthias.klose | 2007-01-11 12:44:04 +0100 (Thu, 11 Jan 2007) | 2 lines

  - idle: Honor the "Cancel" action in the save dialog (Debian bug #299092).
........
  r53381 | raymond.hettinger | 2007-01-11 19:22:55 +0100 (Thu, 11 Jan 2007) | 1 line

  SF #1486663 -- Allow keyword args in subclasses of set() and frozenset().
........
  r53388 | thomas.heller | 2007-01-11 22:18:56 +0100 (Thu, 11 Jan 2007) | 4 lines

  Fixes for 64-bit Windows: In ctypes.wintypes, correct the definitions
  of HANDLE, WPARAM, LPARAM data types.  Make parameterless foreign
  function calls work.
........
  r53390 | thomas.heller | 2007-01-11 22:23:12 +0100 (Thu, 11 Jan 2007) | 2 lines

  Correct the comments: the code is right.
........
  r53393 | brett.cannon | 2007-01-12 08:27:52 +0100 (Fri, 12 Jan 2007) | 3 lines

  Fix error where the end of a funcdesc environment was accidentally moved too
  far down.
........
  r53397 | anthony.baxter | 2007-01-12 10:35:56 +0100 (Fri, 12 Jan 2007) | 3 lines

  add parsetok.h as a dependency - previously, changing this file doesn't
  cause the right files to be rebuilt.
........
  r53401 | thomas.heller | 2007-01-12 21:08:19 +0100 (Fri, 12 Jan 2007) | 3 lines

  Avoid warnings in the test suite because ctypes.wintypes cannot be
  imported on non-windows systems.
........
  r53402 | thomas.heller | 2007-01-12 21:17:34 +0100 (Fri, 12 Jan 2007) | 6 lines

  patch #1610795: BSD version of ctypes.util.find_library, by Martin
  Kammerhofer.

  release25-maint backport candidate, but the release manager has to
  decide.
........
  r53403 | thomas.heller | 2007-01-12 21:21:53 +0100 (Fri, 12 Jan 2007) | 3 lines

  patch #1610795: BSD version of ctypes.util.find_library, by Martin
  Kammerhofer.
........
  r53406 | brett.cannon | 2007-01-13 01:29:49 +0100 (Sat, 13 Jan 2007) | 2 lines

  Deprecate the sets module.
........
  r53407 | georg.brandl | 2007-01-13 13:31:51 +0100 (Sat, 13 Jan 2007) | 3 lines

  Fix typo.
........
  r53409 | marc-andre.lemburg | 2007-01-13 22:00:08 +0100 (Sat, 13 Jan 2007) | 16 lines

  Bump version number and change copyright year.

  Add new API linux_distribution() which supports reading the full distribution
  name and also knows how to parse LSB-style release files.

  Redirect the old dist() API to the new API (using the short distribution name
  taken from the release file filename).

  Add branch and revision to _sys_version().

  Add work-around for Cygwin to libc_ver().

  Add support for IronPython (thanks for Anthony Baxter) and make
  Jython support more robust.
........
  r53410 | neal.norwitz | 2007-01-13 22:22:37 +0100 (Sat, 13 Jan 2007) | 1 line

  Fix grammar in docstrings
........
  r53411 | marc-andre.lemburg | 2007-01-13 23:32:21 +0100 (Sat, 13 Jan 2007) | 9 lines

  Add parameter sys_version to _sys_version().

  Change the cache for _sys_version() to take the parameter into account.

  Add support for parsing the IronPython 1.0.1 sys.version value - even
  though it still returns '1.0.0'; the version string no longer includes
  the patch level.
........
  r53412 | peter.astrand | 2007-01-13 23:35:35 +0100 (Sat, 13 Jan 2007) | 1 line

  Fix for bug #1634343: allow specifying empty arguments on Windows
........
  r53414 | marc-andre.lemburg | 2007-01-13 23:59:36 +0100 (Sat, 13 Jan 2007) | 14 lines

  Add Python implementation to the machine details.

  Pretty-print the Python version used for running PyBench.

  Let the user know when calibration has finished.

  [ 1563844 ] pybench support for IronPython:

  Simplify Unicode version detection.

  Make garbage collection and check interval settings optional if
  the Python implementation doesn't support thess (e.g. IronPython).
........
  r53415 | marc-andre.lemburg | 2007-01-14 00:13:54 +0100 (Sun, 14 Jan 2007) | 5 lines

  Use defaults if sys.executable isn't set (e.g. on Jython).

  This change allows running PyBench under Jython.
........
  r53416 | marc-andre.lemburg | 2007-01-14 00:15:33 +0100 (Sun, 14 Jan 2007) | 3 lines

  Jython doesn't have sys.setcheckinterval() - ignore it in that case.
........
  r53420 | gerhard.haering | 2007-01-14 02:43:50 +0100 (Sun, 14 Jan 2007) | 29 lines

  Merged changes from standalone version 2.3.3. This should probably all be
  merged into the 2.5 maintenance branch:

  - self->statement was not checked while fetching data, which could
    lead to crashes if you used the pysqlite API in unusual ways.
    Closing the cursor and continuing to fetch data was enough.

  - Converters are stored in a converters dictionary. The converter name
    is uppercased first. The old upper-casing algorithm was wrong and
    was replaced by a simple call to the Python string's upper() method
    instead.

  -Applied patch by Glyph Lefkowitz that fixes the problem with
   subsequent SQLITE_SCHEMA errors.

  - Improvement to the row type: rows can now be iterated over and have a keys()
    method. This improves compatibility with both tuple and dict a lot.

  - A bugfix for the subsecond resolution in timestamps.

  - Corrected the way the flags PARSE_DECLTYPES and PARSE_COLNAMES are
    checked for. Now they work as documented.

  - gcc on Linux sucks. It exports all symbols by default in shared
    libraries, so if symbols are not unique it can lead to problems with
    symbol lookup.  pysqlite used to crash under Apache when mod_cache
    was enabled because both modules had the symbol cache_init. I fixed
    this by applying the prefix pysqlite_ almost everywhere. Sigh.
........
  r53423 | guido.van.rossum | 2007-01-14 04:46:33 +0100 (Sun, 14 Jan 2007) | 2 lines

  Remove a dependency of this test on $COLUMNS.
........
  r53425 | ka-ping.yee | 2007-01-14 05:25:15 +0100 (Sun, 14 Jan 2007) | 3 lines

  Handle old-style instances more gracefully (display documentation on
  the relevant class instead of documentation on <type 'instance'>).
........
  r53440 | vinay.sajip | 2007-01-14 22:49:59 +0100 (Sun, 14 Jan 2007) | 1 line

  Added WatchedFileHandler (based on SF patch #1598415)
........
  r53441 | vinay.sajip | 2007-01-14 22:50:50 +0100 (Sun, 14 Jan 2007) | 1 line

  Added documentation for WatchedFileHandler (based on SF patch #1598415)
........
  r53442 | guido.van.rossum | 2007-01-15 01:02:35 +0100 (Mon, 15 Jan 2007) | 2 lines

  Doc patch matching r53434 (htonl etc. now always take/return positive ints).
........

1 files changed, 300 insertions, 70 deletions

diff --git a/Lib/platform.py b/Lib/platform.py
index cf58819..ba24b28 100755
--- a/Lib/platform.py
+++ b/Lib/platform.py
@@ -28,12 +28,15 @@
 #      Betancourt, Randall Hopper, Karl Putland, John Farrell, Greg
 #      Andruk, Just van Rossum, Thomas Heller, Mark R. Levinson, Mark
 #      Hammond, Bill Tutt, Hans Nowak, Uwe Zessin (OpenVMS support),
-#      Colin Kong, Trent Mick, Guido van Rossum
+#      Colin Kong, Trent Mick, Guido van Rossum, Anthony Baxter
 #
 #    History:
 #
 #    <see CVS and SVN checkin messages for history>
 #
+#    1.0.6 - added linux_distribution()
+#    1.0.5 - fixed Java support to allow running the module on Jython
+#    1.0.4 - added IronPython support
 #    1.0.3 - added normalization of Windows system name
 #    1.0.2 - added more Windows support
 #    1.0.1 - reformatted to make doc.py happy
@@ -88,7 +91,7 @@
 
 __copyright__ = """
     Copyright (c) 1999-2000, Marc-Andre Lemburg; mailto:mal@lemburg.com
-    Copyright (c) 2000-2003, eGenix.com Software GmbH; mailto:info@egenix.com
+    Copyright (c) 2000-2007, eGenix.com Software GmbH; mailto:info@egenix.com
 
     Permission to use, copy, modify, and distribute this software and its
     documentation for any purpose and without fee or royalty is hereby granted,
@@ -107,7 +110,7 @@ __copyright__ = """
 
 """
 
-__version__ = '1.0.4'
+__version__ = '1.0.6'
 
 import sys,string,os,re
 
@@ -136,6 +139,11 @@ def libc_ver(executable=sys.executable,lib='',version='',
         The file is read and scanned in chunks of chunksize bytes.
 
     """
+    if hasattr(os.path, 'realpath'):
+        # Python 2.2 introduced os.path.realpath(); it is used
+        # here to work around problems with Cygwin not being
+        # able to open symlinks for reading
+        executable = os.path.realpath(executable)
     f = open(executable,'rb')
     binary = f.read(chunksize)
     pos = 0
@@ -218,14 +226,69 @@ def _dist_try_harder(distname,version,id):
     return distname,version,id
 
 _release_filename = re.compile(r'(\w+)[-_](release|version)')
-_release_version = re.compile(r'([\d.]+)[^(]*(?:\((.+)\))?')
-
-# Note:In supported_dists below we need 'fedora' before 'redhat' as in
-# Fedora redhat-release is a link to fedora-release.
-
-def dist(distname='',version='',id='',
-
-         supported_dists=('SuSE', 'debian', 'fedora', 'redhat', 'mandrake')):
+_lsb_release_version = re.compile(r'(.+)'
+                                   ' release '
+                                   '([\d.]+)'
+                                   '[^(]*(?:\((.+)\))?')
+_release_version = re.compile(r'([^0-9]+)'
+                               '(?: release )?'
+                               '([\d.]+)'
+                               '[^(]*(?:\((.+)\))?')
+
+# See also http://www.novell.com/coolsolutions/feature/11251.html
+# and http://linuxmafia.com/faq/Admin/release-files.html 
+# and http://data.linux-ntfs.org/rpm/whichrpm
+# and http://www.die.net/doc/linux/man/man1/lsb_release.1.html
+
+_supported_dists = ('SuSE', 'debian', 'fedora', 'redhat', 'centos',
+                    'mandrake', 'rocks', 'slackware', 'yellowdog',
+                    'gentoo', 'UnitedLinux')
+
+def _parse_release_file(firstline):
+    
+    # Parse the first line
+    m = _lsb_release_version.match(firstline)
+    if m is not None:
+        # LSB format: "distro release x.x (codename)"
+        return tuple(m.groups())
+
+    # Pre-LSB format: "distro x.x (codename)"
+    m = _release_version.match(firstline)
+    if m is not None:
+        return tuple(m.groups())
+
+    # Unkown format... take the first two words
+    l = string.split(string.strip(firstline))
+    if l:
+        version = l[0]
+        if len(l) > 1:
+            id = l[1]
+        else:
+            id = ''
+    return '', version, id
+
+def _test_parse_release_file():
+    
+    for input, output in (
+        # Examples of release file contents:
+        ('SuSE Linux 9.3 (x86-64)', ('SuSE Linux ', '9.3', 'x86-64'))
+        ('SUSE LINUX 10.1 (X86-64)', ('SUSE LINUX ', '10.1', 'X86-64'))
+        ('SUSE LINUX 10.1 (i586)', ('SUSE LINUX ', '10.1', 'i586'))
+        ('Fedora Core release 5 (Bordeaux)', ('Fedora Core', '5', 'Bordeaux'))
+        ('Red Hat Linux release 8.0 (Psyche)', ('Red Hat Linux', '8.0', 'Psyche'))
+        ('Red Hat Linux release 9 (Shrike)', ('Red Hat Linux', '9', 'Shrike'))
+        ('Red Hat Enterprise Linux release 4 (Nahant)', ('Red Hat Enterprise Linux', '4', 'Nahant'))
+        ('CentOS release 4', ('CentOS', '4', None))
+        ('Rocks release 4.2.1 (Cydonia)', ('Rocks', '4.2.1', 'Cydonia'))
+        ):
+        parsed = _parse_release_file(input)
+        if parsed != output:
+            print (input, parsed)
+
+def linux_distribution(distname='', version='', id='',
+
+                       supported_dists=_supported_dists,
+                       full_distribution_name=1):
 
     """ Tries to determine the name of the Linux OS distribution name.
 
@@ -233,6 +296,15 @@ def dist(distname='',version='',id='',
         /etc and then reverts to _dist_try_harder() in case no
         suitable files are found.
 
+        supported_dists may be given to define the set of Linux
+        distributions to look for. It defaults to a list of currently
+        supported Linux distributions identified by their release file
+        name.
+
+        If full_distribution_name is true (default), the full
+        distribution read from the OS is returned. Otherwise the short
+        name taken from supported_dists is used.
+
         Returns a tuple (distname,version,id) which default to the
         args given as parameters.
 
@@ -242,33 +314,50 @@ def dist(distname='',version='',id='',
     except os.error:
         # Probably not a Unix system
         return distname,version,id
+    etc.sort()
     for file in etc:
         m = _release_filename.match(file)
-        if m:
+        if m is not None:
             _distname,dummy = m.groups()
             if _distname in supported_dists:
                 distname = _distname
                 break
     else:
         return _dist_try_harder(distname,version,id)
-    f = open('/etc/'+file,'r')
+    
+    # Read the first line
+    f = open('/etc/'+file, 'r')
     firstline = f.readline()
     f.close()
-    m = _release_version.search(firstline)
-    if m:
-        _version,_id = m.groups()
-        if _version:
-            version = _version
-        if _id:
-            id = _id
-    else:
-        # Unkown format... take the first two words
-        l = string.split(string.strip(firstline))
-        if l:
-            version = l[0]
-            if len(l) > 1:
-                id = l[1]
-    return distname,version,id
+    _distname, _version, _id = _parse_release_file(firstline)
+
+    if _distname and full_distribution_name:
+        distname = _distname
+    if _version:
+        version = _version
+    if _id:
+        id = _id
+    return distname, version, id
+
+# To maintain backwards compatibility:
+    
+def dist(distname='',version='',id='',
+
+         supported_dists=_supported_dists):
+
+    """ Tries to determine the name of the Linux OS distribution name.
+
+        The function first looks for a distribution release file in
+        /etc and then reverts to _dist_try_harder() in case no
+        suitable files are found.
+
+        Returns a tuple (distname,version,id) which default to the
+        args given as parameters.
+
+    """
+    return linux_distribution(distname, version, id,
+                              supported_dists=supported_dists,
+                              full_distribution_name=0)
 
 class _popen:
 
@@ -357,7 +446,7 @@ def popen(cmd, mode='r', bufsize=None):
     else:
         return popen(cmd,mode,bufsize)
 
-def _norm_version(version,build=''):
+def _norm_version(version, build=''):
 
     """ Normalize the version and build strings and return a single
         version string using the format major.minor.build (or patchlevel).
@@ -378,7 +467,7 @@ _ver_output = re.compile(r'(?:([\w ]+) ([\w.]+) '
                          '.*'
                          'Version ([\d.]+))')
 
-def _syscmd_ver(system='',release='',version='',
+def _syscmd_ver(system='', release='', version='',
 
                supported_platforms=('win32','win16','dos','os2')):
 
@@ -418,7 +507,7 @@ def _syscmd_ver(system='',release='',version='',
     # Parse the output
     info = string.strip(info)
     m = _ver_output.match(info)
-    if m:
+    if m is not None:
         system,release,version = m.groups()
         # Strip trailing dots from version and release
         if release[-1] == '.':
@@ -615,8 +704,11 @@ def _java_getprop(name,default):
 
     from java.lang import System
     try:
-        return System.getProperty(name)
-    except:
+        value = System.getProperty(name)
+        if value is None:
+            return default
+        return value
+    except AttributeError:
         return default
 
 def java_ver(release='',vendor='',vminfo=('','',''),osinfo=('','','')):
@@ -637,20 +729,20 @@ def java_ver(release='',vendor='',vminfo=('','',''),osinfo=('','','')):
     except ImportError:
         return release,vendor,vminfo,osinfo
 
-    vendor = _java_getprop('java.vendor',vendor)
-    release = _java_getprop('java.version',release)
-    vm_name,vm_release,vm_vendor = vminfo
-    vm_name = _java_getprop('java.vm.name',vm_name)
-    vm_vendor = _java_getprop('java.vm.vendor',vm_vendor)
-    vm_release = _java_getprop('java.vm.version',vm_release)
-    vminfo = vm_name,vm_release,vm_vendor
-    os_name,os_version,os_arch = osinfo
-    os_arch = _java_getprop('java.os.arch',os_arch)
-    os_name = _java_getprop('java.os.name',os_name)
-    os_version = _java_getprop('java.os.version',os_version)
-    osinfo = os_name,os_version,os_arch
-
-    return release,vendor,vminfo,osinfo
+    vendor = _java_getprop('java.vendor', vendor)
+    release = _java_getprop('java.version', release)
+    vm_name, vm_release, vm_vendor = vminfo
+    vm_name = _java_getprop('java.vm.name', vm_name)
+    vm_vendor = _java_getprop('java.vm.vendor', vm_vendor)
+    vm_release = _java_getprop('java.vm.version', vm_release)
+    vminfo = vm_name, vm_release, vm_vendor
+    os_name, os_version, os_arch = osinfo
+    os_arch = _java_getprop('java.os.arch', os_arch)
+    os_name = _java_getprop('java.os.name', os_name)
+    os_version = _java_getprop('java.os.version', os_version)
+    osinfo = os_name, os_version, os_arch
+
+    return release, vendor, vminfo, osinfo
 
 ### System name aliasing
 
@@ -716,7 +808,7 @@ def _platform(*args):
     # Format the platform string
     platform = string.join(
         map(string.strip,
-            filter(len,args)),
+            filter(len, args)),
         '-')
 
     # Cleanup some possible filename obstacles...
@@ -871,7 +963,10 @@ def architecture(executable=sys.executable,bits='',linkage=''):
         bits = str(size*8) + 'bit'
 
     # Get data from the 'file' system command
-    output = _syscmd_file(executable,'')
+    if executable:
+        output = _syscmd_file(executable, '')
+    else:
+        output = ''
 
     if not output and \
        executable == sys.executable:
@@ -960,6 +1055,10 @@ def uname():
             release,version,csd,ptype = win32_ver()
             if release and version:
                 use_syscmd_ver = 0
+            # XXX Should try to parse the PROCESSOR_* environment variables
+            # available on Win XP and later; see
+            # http://support.microsoft.com/kb/888731 and
+            # http://www.geocities.com/rick_lively/MANUALS/ENV/MSWIN/PROCESSI.HTM
 
         # Try the 'ver' system command available on some
         # platforms
@@ -1092,36 +1191,136 @@ def processor():
 
 ### Various APIs for extracting information from sys.version
 
-_sys_version_parser = re.compile(r'([\w.+]+)\s*'
-                                  '\(#?([^,]+),\s*([\w ]+),\s*([\w :]+)\)\s*'
-                                  '\[([^\]]+)\]?')
-_sys_version_cache = None
+_sys_version_parser = re.compile(
+    r'([\w.+]+)\s*'
+    '\(#?([^,]+),\s*([\w ]+),\s*([\w :]+)\)\s*'
+    '\[([^\]]+)\]?')
+
+_jython_sys_version_parser = re.compile(
+    r'([\d\.]+)')
+
+_ironpython_sys_version_parser = re.compile(
+    r'IronPython\s*'
+    '([\d\.]+)'
+    '(?: \(([\d\.]+)\))?'
+    ' on (.NET [\d\.]+)')
 
-def _sys_version():
+_sys_version_cache = {}
+
+def _sys_version(sys_version=None):
 
     """ Returns a parsed version of Python's sys.version as tuple
-        (version, buildno, builddate, compiler) referring to the Python
-        version, build number, build date/time as string and the compiler
-        identification string.
+       (name, version, branch, revision, buildno, builddate, compiler)
+       referring to the Python implementation name, version, branch,
+       revision, build number, build date/time as string and the compiler
+       identification string.
 
         Note that unlike the Python sys.version, the returned value
         for the Python version will always include the patchlevel (it
         defaults to '.0').
 
+        The function returns empty strings for tuple entries that
+        cannot be determined.
+
+        sys_version may be given to parse an alternative version
+        string, e.g. if the version was read from a different Python
+        interpreter.
+
     """
-    global _sys_version_cache
+    # Get the Python version
+    if sys_version is None:
+        sys_version = sys.version
 
-    if _sys_version_cache is not None:
-        return _sys_version_cache
-    version, buildno, builddate, buildtime, compiler = \
-             _sys_version_parser.match(sys.version).groups()
-    builddate = builddate + ' ' + buildtime
+    # Try the cache first
+    result = _sys_version_cache.get(sys_version, None)
+    if result is not None:
+        return result
+
+    # Parse it
+    if sys_version[:10] == 'IronPython':
+        # IronPython
+        name = 'IronPython'
+        match = _ironpython_sys_version_parser.match(sys_version)
+        if match is None:
+            raise ValueError(
+                'failed to parse IronPython sys.version: %s' %
+                repr(sys_version))
+        version, alt_version, compiler = match.groups()
+        branch = ''
+        revision = ''
+        buildno = ''
+        builddate = ''
+
+    elif sys.platform[:4] == 'java':
+        # Jython
+        name = 'Jython'
+        match = _jython_sys_version_parser.match(sys_version)
+        if match is None:
+            raise ValueError(
+                'failed to parse Jython sys.version: %s' %
+                repr(sys_version))
+        version, = match.groups()
+        branch = ''
+        revision = ''
+        compiler = sys.platform
+        buildno = ''
+        builddate = ''
+
+    else:
+        # CPython
+        match = _sys_version_parser.match(sys_version)
+        if match is None:
+            raise ValueError(
+                'failed to parse CPython sys.version: %s' %
+                repr(sys_version))
+        version, buildno, builddate, buildtime, compiler = \
+              match.groups()
+        if hasattr(sys, 'subversion'):
+            # sys.subversion was added in Python 2.5
+            name, branch, revision = sys.subversion
+        else:
+            name = 'CPython'
+            branch = ''
+            revision = ''
+        builddate = builddate + ' ' + buildtime
+
+    # Add the patchlevel version if missing
     l = string.split(version, '.')
     if len(l) == 2:
         l.append('0')
         version = string.join(l, '.')
-    _sys_version_cache = (version, buildno, builddate, compiler)
-    return _sys_version_cache
+
+    # Build and cache the result
+    result = (name, version, branch, revision, buildno, builddate, compiler)
+    _sys_version_cache[sys_version] = result
+    return result
+
+def _test_sys_version():
+
+    _sys_version_cache.clear()
+    for input, output in (
+        ('2.4.3 (#1, Jun 21 2006, 13:54:21) \n[GCC 3.3.4 (pre 3.3.5 20040809)]',
+         ('CPython', '2.4.3', '', '', '1', 'Jun 21 2006 13:54:21', 'GCC 3.3.4 (pre 3.3.5 20040809)')),
+        ('IronPython 1.0.60816 on .NET 2.0.50727.42',
+         ('IronPython', '1.0.60816', '', '', '', '', '.NET 2.0.50727.42')),
+        ('IronPython 1.0 (1.0.61005.1977) on .NET 2.0.50727.42',
+         ('IronPython', '1.0.0', '', '', '', '', '.NET 2.0.50727.42')),
+        ):
+        parsed = _sys_version(input)
+        if parsed != output:
+            print (input, parsed)
+
+def python_implementation():
+
+    """ Returns a string identifying the Python implementation.
+
+        Currently, the following implementations are identified:
+        'CPython' (C implementation of Python),
+        'IronPython' (.NET implementation of Python),
+        'Jython' (Java implementation of Python).
+
+    """
+    return _sys_version()[0]
 
 def python_version():
 
@@ -1131,7 +1330,9 @@ def python_version():
         will always include the patchlevel (it defaults to 0).
 
     """
-    return _sys_version()[0]
+    if hasattr(sys, 'version_info'):
+        return '%i.%i.%i' % sys.version_info[:3]
+    return _sys_version()[1]
 
 def python_version_tuple():
 
@@ -1142,7 +1343,36 @@ def python_version_tuple():
         will always include the patchlevel (it defaults to 0).
 
     """
-    return string.split(_sys_version()[0], '.')
+    if hasattr(sys, 'version_info'):
+        return sys.version_info[:3]
+    return tuple(string.split(_sys_version()[1], '.'))
+
+def python_branch():
+
+    """ Returns a string identifying the Python implementation
+        branch.
+
+        For CPython this is the Subversion branch from which the
+        Python binary was built.
+
+        If not available, an empty string is returned.
+
+    """
+    
+    return _sys_version()[2]
+
+def python_revision():
+
+    """ Returns a string identifying the Python implementation
+        revision.
+
+        For CPython this is the Subversion revision from which the
+        Python binary was built.
+
+        If not available, an empty string is returned.
+
+    """
+    return _sys_version()[3]
 
 def python_build():
 
@@ -1150,7 +1380,7 @@ def python_build():
         build number and date as strings.
 
     """
-    return _sys_version()[1:3]
+    return _sys_version()[4:6]
 
 def python_compiler():
 
@@ -1158,7 +1388,7 @@ def python_compiler():
         Python.
 
     """
-    return _sys_version()[3]
+    return _sys_version()[6]
 
 ### The Opus Magnum of platform strings :-)
 
@@ -1219,7 +1449,7 @@ def platform(aliased=0, terse=0):
     elif system == 'Java':
         # Java platforms
         r,v,vminfo,(os_name,os_version,os_arch) = java_ver()
-        if terse:
+        if terse or not os_name:
             platform = _platform(system,release,version)
         else:
             platform = _platform(system,release,version,