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The final version of Python 2.0 was released on October 16, 2000.DownloadWhat's new (overview)What's new (details)Post-release newsFor critical patches, a Python 2.0 specific FAQ, and other issuesthat have come up since the release, please go to the new Python 2.0 infoarea, a set of user-editable webpages. If you have informationabout Python 2.0 you can discuss it there.Bugs and PatchesTo report a bug, always use the SourceForge Bug Tracker. Ifyou have a patch, please use the SourceForge Patch Manager.DownloadThe final version of Python 2.0 is available for download now.Windows installer. To install Python, Windows users need only download the Windowsinstaller and run it.Source code (.tar.gz, 3.9MB) or(.tar.bz2, 3.3MB)Linux RPMsPackageSource (gzip)Source (bzip2)Source RPMRedHat 6.1 RPMBeOpen-Python-2.0.tar.gz.tar.bz2.src.rpm.i386.rpmexpat-1.1N/AN/A.src.rpm.i386.rpmTkinter-2.0-8.0.tar.gz.tar.bz2.src.rpm.i386.rpm browse or download documentationNotes for Windows users:If you're running Windows 95, 98, ME, NT or 2000, all you need isthe Windows installer. It includes Python, Tcl/Tk, and thedocumentation in HTML format. Simply download the installer and runit.Some browsers remove the ".exe"suffix of the downloaded installer file. If this happens to you,simply rename the downloaded file to "python20.exe" before youdouble-click it to run the installer. Also, if you have everinstalled an older Python version (especially distributions fromPythonWare), you may have to remove references to it from yourautoexec.bat. Advanced Windows developers may also wish to download the Win32 extensions, by Mark Hammond of ActiveState. These makemany Microsoft Windows APIs available from Python.Incompatibility warning: Norton Antivirus 2000 can causeblue screen crashes on Windows 98 when a function in the os.popen*()family is invoked. To prevent this problem, disable Norton Antiviruswhen using Python. (Confirmed on Windows 98 Second Edition withNorton Antivirus version 6.10.20. The same Norton Antivirus versiondoesn't have this problem on Windows 2000. Norton Antivirus version 5on Windows 98SE doesn't have this problem either.)What's New in Python 2.0?For a comprehensive discussion of the differences between Python2.0 and Python 1.5.2, please see the article What's New in Python 2.0 by A.M. Kuchlingand Moshe Zadka.What's new in 2.0 (since release candidate 1)?Standard libraryThe copy_reg module was modified to clarify its intended use: to register pickle support for extension types, not for classes. pickle() will raise a TypeError if it is passed a class.Fixed a bug in gettext's "normalize and expand" code that prevented it from finding an existing .mo file.Restored support for HTTP/0.9 servers in httplib.The math module was changed to stop raising OverflowError in case of underflow, and return 0 instead in underflow cases. Whether Python used to raise OverflowError in case of underflow was platform- dependent (it did when the platform math library set errno to ERANGE on underflow).Fixed a bug in StringIO that occurred when the file position was not at the end of the file and write() was called with enough data to extend past the end of the file.Fixed a bug that caused Tkinter error messages to get lost on Windows. The bug was fixed by replacing direct use of interp->result with Tcl_GetStringResult(interp).Fixed bug in urllib2 that caused it to fail when it received an HTTP redirect response.Several changes were made to distutils: Some debugging code was removed from util. Fixed the installer used when an external zip program (like WinZip) is not found; the source code for this installer is in Misc/distutils. check_lib() was modified to behave more like AC_CHECK_LIB by add other_libraries() as a parameter. The test for whether installed modules are on sys.path was changed to use both normcase() and normpath().Several minor bugs were fixed in the xml package (the minidom, pulldom, expatreader, and saxutils modules).The regression test driver (regrtest.py) behavior when invoked with -l changed: It now reports a count of objects that are recognized as garbage but not freed by the garbage collector.The regression test for the math module was changed to test exceptional behavior when the test is run in verbose mode. Python cannot yet guarantee consistent exception behavior across platforms, so the exception part of test_math is run only in verbose mode, and may fail on your platform.InternalsPyOS_CheckStack() has been disabled on Win64, where it caused test_sre to fail.Build issuesChanged compiler flags, so that gcc is always invoked with -Wall and -Wstrict-prototypes. Users compiling Python with GCC should see exactly one warning, except if they have passed configure the --with-pydebug flag. The expected warning is for getopt() in Modules/main.c. This warning will be fixed for Python 2.1.Fixed configure to add -threads argument during linking on OSF1. Tools and other miscellanyThe compiler in Tools/compiler was updated to support the new language features introduced in 2.0: extended print statement, list comprehensions, and augmented assignments. The new compiler should also be backwards compatible with Python 1.5.2; the compiler will always generate code for the version of the interpreter it runs under. What's new in 2.0 release candidate 1 (since beta 2)?What is release candidate 1?We believe that release candidate 1 will fix all known bugs that weintend to fix for the 2.0 final release. This release should be a bitmore stable than the previous betas. We would like to see even morewidespread testing before the final release, so we are producing thisrelease candidate. The final release will be exactly the same unlessany show-stopping (or brown bag) bugs are found by testers of therelease candidate.All the changes since the last beta release are bug fixes or changesto support building Python for specific platforms.Core language, builtins, and interpreterA 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 libraryKeyword arguments are now accepted for most pattern and match object methods in SRE, the standard regular expression engine.In SRE, fixed error with negative lookahead and lookbehind that manifested itself as a runtime error in patterns like "(?