$Id: README,v 1.30 2004/06/13 14:57:19 jt Exp $

Abstract:

This is the README for the Cygwin Python distribution.

Python is an interpreted, interactive, object-oriented programming
language often compared to Tcl, Perl, Scheme or Java. Python includes
modules, classes, exceptions, very high level dynamic data types and
dynamic typing. Python supports interfaces to many system calls and
libraries, as well as to various windowing systems (X11, Motif, Tk,
Mac and MFC).

As of Cygwin Python 2.3.3-2, all known 64-bit I/O issues have been
resolved.

As of Cygwin Python 2.2.2-3, it is assumed that your Cygwin system has
been rebased in order to prevent fork() failures due to DLL base address
conflicts.  Previous versions worked around this issue by building the
_socket module statically.  This hack no longer works with current
Cygwin versions.  See the issues section for more details.

As of Cygwin Python 2.2.1-1, the port supports threading.  Many thanks
to Rob Collins (and others) who enhanced Cygwin's pthreads support to
the level needed by Python.

Additionally, the package now includes the HTML version of the full Python
documentation.

As of Cygwin Python 2.1.1-2, the port is essentially complete (at least
for Windows NT 4.0 and 2000).  The most notable changes are the addition
of the _tkinter module and the elimination of the test_poll hang.

As of Cygwin Python 2.1, the port is built with a DLL core very similar
to how the Win32 port is built.  This enables Cygwin Python to support
building shared extensions with the traditional Misc/Makefile.pre.in
and the newer distutils methods.

Requirements:

The following packages or later are required to build and/or execute
Cygwin Python:

    cygwin 1.5.10-3
    binutils 20040312-1
    gcc 3.3.1-3

The following packages or later are required to build and/or execute
some of the standard Cygwin Python extension modules:

    gdbm 1.8.3-7            (gdbm)
    libdb4.2 4.2.52-1       (bsddb)
    libdb4.2-devel 4.2.52-1 (bsddb)
    libncurses7 5.3-4       (_curses and _curses_panel)
    libncurses-devel 5.3-4  (_curses and _curses_panel)
    openssl 0.9.7d-1        (_socket)
    openssl-devel 0.9.7d-1  (_socket)
    readline 4.3-5          (readline)
    tcltk 20030901-1        (_tkinter)
    zlib 1.2.1-1            (zlib)

Install:

Cygwin Python does not require any special installation procedures.
However, _tkinter users should see the issues section.

Source:

Although Python builds OOTB under Cygwin, one patch has been applied:

    http://sf.net/tracker/?func=detail&atid=105470&aid=794140&group_id=5470

to enable embedding Python in other Cygwin applications.

I also added the following files to the source archive:

    CYGWIN-PATCHES/README: (this) README file
    CYGWIN-PATCHES/build.sh: build script
    CYGWIN-PATCHES/python.patch
    CYGWIN-PATCHES/html-$version.tar.bz2: pre-generated Python HTML
        documentation since Cygwin cannot currently self-generate it

and renamed the original source archive to match Cygwin's setup.exe
naming conventions.

To restore the Python source to its original state, perform the following:

    $ cd python-$version-$package
    $ patch -R -p1 <CYGWIN-PATCHES/python.patch
    $ rm -fr CYGWIN-PATCHES

where $version is the Python version (e.g., 2.2.1) and $package is the
Cygwin package number.

Build:

This distribution has been configured as follows:

    configure --prefix=/usr --mandir='${prefix}/share/man'

See CYGWIN-PATCHES/build.sh in the source archive for my exact build
recipe for configuring, making, and packaging this distribution.

Test:

Under 2000 SP3, Cygwin 1.5.10-3, ntsec, and NTFS, Cygwin Python passes
all tests except that test_threadedtempfile hangs.

It is expected that Cygwin Python will behave the same as (or at least
very similar to) 2000 under NT 4.0 and XP.  Use the following to run the
regression test on these platforms:

    $ make test

Under 9X/Me, Cygwin Python is known to hang, freeze the system, or page
fault in some of the regression tests.  See the platform specific
details below.  Use the following to run the regression test:

    $ make TESTOPTS='-l -x $EXCLUDED_TESTS' test

where $EXCLUDED_TESTS is the list of tests to exclude from the test
suite.

The following are the reported regression test failures for the various
9X/Me platforms:

95: (no one)
    not available

95 OSR2: (Pete Forman)
    test_dircache
    test_fork1 [1]
    test_hotshot [2]
    test_mmap
    test_popen2 [1]
    test_pty [1]
    test_socket

98: (Hal Wine)
    test_dircache
    test_fork1 [3]
    test_hotshot [2]
    test_mmap
    test_popen2 [3]
    test_pty [1]
    test_socket [1]

98 SE: (Hannu E K Nevalainen)
    test_dircache
    test_fork1 [1]
    test_hotshot [2]
    test_mmap
    test_popen2 [1]
    test_pty [1]
    test_socket [1]

Me: (Pierre Humblet)
    test_dircache
    test_fork1 [1]
    test_hotshot [2]
    test_mmap
    test_popen2 [1]
    test_pty [1]

where:

[1] => invalid page faults
[2] => test hang
[3] => system hang

Issues:

The following are the known Cygwin Python issues:

1. On 9X/Me, some regression tests hang, freeze the system, or page
fault.

2. The _tkinter extension module will only be built if the xorg-x11-devel
package is installed.

3. Due to issues with Cygwin's fork() and DLL base address conflicts,
one should rebase their Cygwin system to prevent fork() failures.  Use
the following procedure to rebase your system:

    a. install the Cygwin rebase package (if necessary)
    b. shutdown all Cygwin processes
    c. start bash (do not use rxvt)
    d. execute rebaseall (in the bash window)

4. _tkinter users should note that Cygwin tcltk is really a Win32
package and hence, does *not* understand Cygwin style paths.  To use the
_tkinter module you must define the following environment variables:

    $ export TCL_LIBRARY=$(cygpath -w /usr/share/tcl$version)
    $ export TK_LIBRARY=$(cygpath -w /usr/share/tk$version)

where $version is the TCL/TK version (e.g., 8.4).

For another example of some cygpath coddling, see the following:

    http://cygwin.com/ml/cygwin/2002-10/msg00425.html

Homepage:

The primary Python web site is:

    http://www.python.org/

Download:

The primary Python ftp site is:

    ftp://ftp.python.org/pub/python/

Mailing Lists:

Please report problems, suggestions, etc. dependent on their nature to
one of the following:

    python-list@python.org
    cygwin@cygwin.com

Maintainer:

    Jason Tishler <jason@tishler.net>
