Mailman 3 August 2004 - Python-announce-list

ANN: PythonCard 0.8
by Kevin Altis 23 Aug '04

23 Aug '04

PythonCard is a GUI construction kit for building cross-platform desktop applications on Windows, Mac OS X, and Linux. Release 0.8 includes over 50 sample applications and tools to help users build applications in Python, including codeEditor, findfiles, and resourceEditor (layout editor). A list of changes since release 0.7.3.1 is at the end of this message. New samples include ataxx, lsystem, moderator, montyhall, mp3player, reversi, twistedEchoClient. There is also an experimental reStructuredText and HTML editor in the codeEditor directory called restEditor.py. PythonCard requires Python 2.3 or later and wxPython 2.5.2.7 or later. You can download the latest release at: http://sourceforge.net/project/showfiles.php?group_id=19015 Please be sure to look at the migration_guide.txt file in the docs directory if you are upgrading from a previous release. Since the package name has changed, you can continue to use the older PythonCardPrototype package simultaneously with the new PythonCard package, but you must upgrade to wxPython 2.5.2.7. All the information you need about PythonCard can be found on the project web page at: http://pythoncard.sourceforge.net/ The installation instructions and walkthroughs are available on the main documentation page: http://pythoncard.sourceforge.net/documentation.html For a list of most of the samples that have been built with PythonCard and screenshots of them in action go to: http://pythoncard.sourceforge.net/samples/samples.html The kind people at SourceForge host the project: http://sourceforge.net/projects/pythoncard/ If you want to get involved the main contact point is the Mailing list: http://lists.sourceforge.net/lists/listinfo/pythoncard-users Additional Notes: Remember to backup or just delete your old PythonCard directory before installing a new version, so that the old files aren't still in the package directory. If you installed a previous version of PythonCard on Windows using the binary installer, then you should be able to remove the old package via the Add/Remove Programs Control Panel. The distutils installer will put the framework, components, docs, samples, and tools in Lib\site-packages or your Python directory (typically C:\Python23). Of course, on Linux and Mac OS X that path will be slightly different and have forward slashes. Windows users should get a PythonCard menu in the Start->Programs menu with links to the documentation, samples, codeEditor, findfiles, and resourceEditor. The tools and most of the samples will now keep their config and data file info in the "pythoncard_config" directory created by the framework. On Unix, the directory will be ~/pythoncard_config. On Windows, the directory varies as described in the following post: http://aspn.activestate.com/ASPN/Mail/Message/PythonCard/1496793 So, if you run a PythonCard app with any of the runtime tools and select "Save Configuration" from the "Debug" menu, the window positions and sizes of your runtime windows (Shell, Message Watcher, etc.) will be saved in "pythoncard_config/pythoncard_config.txt" not the PythonCard directory. Likewise, when you change the text style used by the codeEditor via the "Styles..." menu item under the "Format" menu, the modification will be saved in "pythoncard_config/stc-styles.cfg" ka --- Kevin Altis altis(a)semi-retired.com http://altis.pycs.net/ changelog.txt changes since release 0.7.3.1 Release 0.8 2004-08-18 getCommandLineArgs moved to util.py runOptionsDialog moved to templates.dialogs.runOptionsDialog.py dialog.py is now a thin wrapper around wx.lib.dialogs.py all dialog results now use DialogResults class instead of dictionary e.g. result.accepted instead of result['accepted'] see dialogs sample and other samples and tools for examples of change menuDialog changed to insert in place, added default naming based on label changed Calendar component to CAL_SEQUENTIAL_MONTH_SELECTION style added mp3player sample switched to using wx.lib.statbmp.GenStaticBitmap on GTK for Image component Created unit-test facility. defined ignore files for files that should not be imported to check for tests. runAllTests.py runs all tests from the current working directory down, minus ignored. added sample unit test class, in UnitTestSample.py Added two unit tests for LSystem. Pulled out drawAbstractFractal() to allow this. Changed console_server.py and minimalTest.py so that importing the file didn't run code. updated childWindow resource loading to better support standalones refactored resourceEditor to query component spec for default set of attributes in on_componentAdd_command refactored resourceEditor to dynamically build list of available Components instead of using static list converted turtle sample to use Python modules for the script examples fixed resourceEditor so it saves on Run and validates component names changed all occurances of stack in resources to application removed Stack class the application is now the "parent" of the main Background changed __init__ for Background and CustomDialog so they don't take a stack parameter changed childWindow function self.stack.app references are now self.application added lsystem sample added ToggleButton component fixed enableCommand and disableCommand for components & menus added ataxx sample codeEditor now persists all View menu settings added reversi (Othello) sample made spirographInteractive its own sample added restore (inverse of minimize) background window event added twistedEchoClient sample added twistedModel.py module to hold TwistedApplication added redraw method to Widget to simplify immediate redraws added event.target workaround for timer events moved getStyleConfigPath to configuration module renamed stc-styles.rc.cfg to stc-styles.cfg removed unneeded WXMAC code blocks removed get/set methods for position, size, foregroundColor, backgroundColor in Background and CustomDialog and replaced with properties added removeListener method to EventQueue to enable the clean removal of the Message Watcher window when closing app changed codeEditor file dialog default from *.py to *.* fixed Windows border offset in resourceEditor by querying SystemSettings.GetMetric added Bruce Eckel's moderator sample updated Choice, ComboBox, List, RadioGroup to use 'selection' and 'stringSelection' attributes instead of mixed-capability 'selected' and 'selection' attribute see migration guide for more info added templates sub-package to hold common backgrounds and dialogs updated all samples and tools to use lowercase skip() removed CamelCase methods from BitmapCanvas (Draw -> draw) changed Component __init__ init underlying control before Widget class added makeNewId function removed postInit event binding is now part of component init removed getId() from Widget, using GetId() calls in framework *ROWLAND describe binding and spec changes here* added SetValue workaround for TextArea component on Windows removed dispatch.py and moved classes to event.py SetFocus -> setFocus Hide/Show -> visible attribute added visible, position, and size properties to tool windows added Tom Jacobs' montyhall sample added about.py module added About PythonCard dialog to codeEditor and resourceEditor added singleton.py module used by configuration.py, log.py, registry.py, and resource.py removed Ptr classes from isinstance checks removed old addresses052.py sample renamed res.py to resource.py replaced the use of __getattr__ and __setattr__ in Font, StatusBar, and Widget classes with property(), so those classes and components no longer have restrictive attribute access this change also eliminated the need for the _createAttributes and _getAttributeNames methods changed to wx.Frame for runtime tools on Windows to make them the same across platforms removed conditional code check PyCrust since PyCrust is a standard part of wxPython now added createStatusBar method to Background and CustomDialog classes so applications can override that method if they want to use a more complex StatusBar made statusbar.StatusBar a direct subclass of wx.StatusBar renamed PythonCardApp to Application refactored config.py to configuration.py removed PythonCardObject and all references to it removed ObjectMap and all references to it removed ObjectLookup and all references to it changed on_openBackground to on_initialize renamed pom.py to component.py added test.py added timer.py module and simple Timer wrapper added deactivate event to Background updated sound.py to use wx.Sound changed model.py to require Python >= 2.3 and wxPython >= 2.5 converted DC methods to use tuples instead of separate x, y and width, height args changed wx.NULL to None switched to wx package from wxPython import changed to import wx changed wx.wx style prefixes to wx. except for wx.wxEVT constants changed wx.wxHtmlEasyPrinting to wx.html.HtmlEasyPrinting changed default on Message Watcher to show unused events PythonCardPrototype package renamed to PythonCard all references to Prototype updated in source and docs

1 0

Mailing list for Python grant proposals
by "Martin v. Löwis" 23 Aug '04

23 Aug '04

After posting the call for grant proposals, at http://www.python.org/psf/call-2004.html we found that submitters still have a number of questions. In order to encourage a public discussion of such questions, we have created a mailing list grants-discuss(a)python.org, whose info page is at http://mail.python.org/mailman/listinfo/grants-discuss People interested in the call are encourage to subscribe to this list, and post questions and comments. Martin v. Löwis

1 0

ANN: libgmail 0.0.8 - Gmail access via Python - POP3 Proxy added!
by follower＠gmail.com 22 Aug '04

22 Aug '04

libgmail -- Python binding for Google's Gmail service <http://libgmail.sf.net/> The `libgmail` project is a pure Python binding to provide access to Google's Gmail web-mail service. The library currently ships with a demonstration utility to archive messages from a Gmail account into mbox files, suitable for importing into a local email client. Also includes a demonstration utility that acts as a SMTP proxy to allow mail to be sent from any standard mail client that uses SMTP (e.g. Mail.app, Mozilla etc). (Now handles attachments.) New demonstration utility acts as a POP3 proxy to allow mail to be retrieved from any standard mail client that uses POP3 (e.g. Mail.app, Mozilla etc). Features demonstration utility to provide access to Gmail message attachments via a download-only FTP proxy--this allows retrieval of suitably marked attachments by a standard FTP client. Utilize more of your Gmail space! License: GPL 2.0 (gmailftpd.py/gmailpopd.py are dual licensed with PSF) Major changes since 0.0.7: * Fixed login to work again after it was broken by a Gmail change. * Added trash/delete message thread & trash/delete single message functionality. (By request.) * POP3 proxy server demo. (By request.) * Added `GmailLoginFailure` exception to enable tidier handling of login failures (which could be bad username/password or a Gmail change). <p><a href="http://libgmail.sf.net/">libgmail 0.0.8</a> - The `libgmail` project is a pure Python binding to provide access to Google's Gmail web-mail service; includes SMTP, POP3 & FTP proxies. (23-Aug-04)</p>

1 0

[ANN]PyCrash-0.4-pre3 released
by Carmine Noviello 21 Aug '04

21 Aug '04

Hi, a new version of PyCrash is released with new features and improvement.You can download it at: http://sourceforge.net/project/showfiles.php?group_id=98026&package_id=1110… What's new in this release: * Many bug-fixes expecially related to the Win32 platform. Special thanks to Gary Herron and Michele Petrazzo for their support. Enjoy! _______________________________________________________________________ About PyCrash Project: PyCrash is a Run-Time Exception Dumper which handles uncaught exceptions during the execution of Python programs and collects information about the program context. PyCrash can be very useful in report bug information, because the programmer can easily analyse the program execution context of the crashed application. Major information collected by PyCrash in the crash dump is: - Information about operating system, Python and Python Standard Library version and general information about the program that is crashed (e.g., program name and version, time at witch program started and ended, and so on) - Information about the uncaught exceptions, like the exception type, the context (namely method name) in which the exception occurred and the exception value - General information about variables state - Information about the stack of each thread, like the list of stack frames, the variables value in each stack frame, and so on - General information about source code, like variable and function position in source file that can be useful for the programmer to find quickly bugs in source tree The format of the crash dump file generated by PyCrash is XML, so the programmer can easily read this file to understand why the program is crashed. Now, is also available a GUI browser, named PyCrash Viewer, which allows developers to analyze quickly and easily PyCrash crash dump files in a graphical manner. * Starting from next version, we'll try to document all the PyCrash API More information can be found at: http://www.pycrash.org Thanks! <P><A HREF="http://www.pycrash.org";>PyCrash 0.4pre3</A> - a crash handler for Python written applications. (21-08-04)</P>

1 0

[ANN] includer, proxycleaner and pyhtonutils updates
by Voidspace 20 Aug '04

20 Aug '04

Several new scripts and module updates over at pythonutils. Visit http://www.voidspace.org.uk/atlantibots/pythonutils.html *NEW* includer.py Version 1.0.0 Adds an INCLUDE command to python scripts for including other modules into them. Lots of nifty features including recursive include, incdir command, will remove relevant import statements and anything under the 'if __name__ ==...' line from included scripts etc.... Useful for distributing modules with several dependencies as a single file. The features mean that it's possible to test a module using normal import statements (of the type from module import....). When you run includer.py, the INCLUDE command causes your included script (minus the test code under a 'if __name__ ==...' line) to be added in *and* the import statements are removed. Using ##INCLUDE is the equivalent of 'from module import *' - avoiding namespace pollution is up to you. python includer.py infilename outfilename Easy hey ! *NEW* proxycleaner.py Version 1.0.0 *NEW* approxClientproxy.py Version 0.1.0 *UPDATED* approx.py Version 0.4.0 approx.py is a cgiproxy for use by those in restricted internet environments. (Work, internet cafes, colleges, libraries, restrictive regimes etc). It is still at beta stage but functional. Cookie handling with ClientCookie now works although support for multiple users and cookie management will be added. Authentication and POST methods are the next issues to work on. DEBUG mode added. proxycleaner.py will 'clean' webpages that have been fetched through approx or the James Marshall perl cgiproxy. Both these scripts modify URLs a pages are fetched through them - this script undoes the modification. approxClientproxy.py is a client script that works in conjunction with approx.py - it runs on your machine. Instead of having approx modify pages you can point your browser at approxClientproxy which handles the communication between itself and approx. Things like javascript, which approx can't modify, work through aPc which transparently mangles *all* access to go through approx... At the moment it's a crude hack of TCPwatch by the Zope corp.. but it works fine and will only improve. Allows transparent unrestricted http access in a restricted environment. *UPDATE* ConfigObj Version 3.2.0 Removed the charmap 'function' that eliminated unicode errors by stamping on unicode. Unicode problems will now raise an exception. If this causes you problems let me know (with examples if possible) and I'll work on the unicode issues. The test for list type entries is not an 'isinstance' test but a 'hasattr' test (append is the attribute tested for). This isn't ubiquitous though. Added the 'stringify' keyword - including changes to the listquote module for this (which is also now a bit faster). fullconfigobj.py is now built using includer.py Uses a newer version of caseless than the previous distribution. Changed license text. *UPDATE* listquote Version 1.1.0 Added handling for non-string elements in elem_quote (optional). Replaced some old += with lists and ''.join() for speed improvements... Using basestring and hasattr('__getitem__') tests instead of isinstance(list) and str in a couple of places. Changed license text. Made the tests useful. *NEW* http_test.py Version 1.2.0 Now at http://www.voidspace.org.uk/atlantibots/recipebook.html (was previously just online in the Python Cookbook) A CGI script that will fetch a URL and display all server headers, saved cookies, the first part of the content (as raw HTML) *and* all the CGI environment variables. Some authentication code as well. Very useful for debugging in various situation or as an illustration of several aspects of basic CGI. # Copyright Michael Foord # Free to use, modify and relicense. # No warranty express or implied for the accuracy, fitness to purpose or otherwise for this code.... # Use at your own risk !!! # E-mail michael AT foord DOT me DOT uk # Maintained at www.voidspace.org.uk/atlantibots/pythonutils.html -- http://www.Voidspace.org.uk The Place where headspace meets cyberspace. Online resource site - covering science, technology, computing, cyberpunk, psychology, spirituality, fiction and more. --- http://www.Voidspace.org.uk/atlantibots/pythonutils.html Python utilities, modules and apps. Including Nanagram, Dirwatcher and more. --- http://www.fuchsiashockz.co.uk http://groups.yahoo.com/group/void-shockz --- Everyone has talent. What is rare is the courage to follow talent to the dark place where it leads. -Erica Jong Ambition is a poor excuse for not having sense enough to be lazy. -Milan Kundera

1 0

ANN: SCons.0.96 adds Fortran 90/95 support, better Qt support, platform-independent file system actions, improved debugging, lots more
by Steven Knight 18 Aug '04

18 Aug '04

SCons is a software construction tool (build tool, or make tool) written in Python. It is based on the design which won the Software Carpentry build tool competition in August 2000. Version 0.96 of SCons has been released and is available for download from the SCons web site: http://www.scons.org/ Or through the download link at the SCons project page at SourceForge: http://sourceforge.net/projects/scons/ RPM and Debian packages and a Win32 installer are all available, in addition to the traditional .tar.gz and .zip files. WHAT'S NEW IN THIS RELEASE? IMPORTANT: Release 0.96 contains the following interface changes: - All Builder calls now return a *list* of Nodes, even when the Builder only builds one file. This may require SConscript file changes if you were manipulating the return values from Builders. - The SConsignFile() function now uses a different internal database format by default. This will cause a rebuild when you upgrade to 0.96 unless you modify your SConsignFile() call. - The internal format of .sconsign files has been changed. The change was coded to be backwards-compatible, but there might be corner cases that cause warnings about "ignoring corrupt .sconsign files" and rebuilds when you use SCons 0.96 for the first time in an already-built tree. - The scan_check function that can be supplied to a custom Scanner now must take two arguments, the Node to be checked and a construction environment. It previously only used the Node as an argument. - The internal "node_factory" and "scanner" keyword arguments have been removed from the Builder() function, in favor of separate "target_factory," "source_factory," "target_scanner" and "source"scanner" keywords, which are now documented. - The Scanner add_skey() function has been dropped in favor of using construction variables for the lists of file suffixes known to a Scanner. - File name extensions that contain all digits are now assumed to be version numbers and treated as part of the file basename. - The env.Append() and env.Prepend() methods have been changed to behave like the rest of Python when either argument is a UserList. See the release notes for more information about these changes. This release adds the following new features: - A new --debug=explain option tells SCons to report the reason(s) why it thinks it must rebuild something. - New Moc() and Uic() Builders provide more explicit control over Qt builds, plus new construction variables to control them: $QT_AUTOSCAN, $QT_DEBUG, $QT_MOCCXXPREFIX, $QT_MOCCXXSUFFIX, $QT_MOCHPREFIX, $QT_MOCHSUFFIX, $QT_UICDECLPREFIX, $QT_UICDECLSUFFIX, $QT_UICIMPLPREFIX, $QT_UICIMPLSUFFIX and $QT_UISUFFIX. - Support for Fortran 90 and Fortran 95 has been added. - The newer "ifort" versions of the Intel Fortran Compiler for Linux are now supported. - New functions have been added to return platform-independent Actions that Chmod(), Copy(), Delete(), Mkdir(), Move() and Touch() files and/or directories. - A new Execute() function can now execute Actions directly at SConscript-read time. - A new $RPATH variable has been added that specifies a list of directories for the GNU and IRIX linkers to search for shared libraries. - New $CPPSUFFIXES, $DSUFFIXES, $FORTRANSUFFIXES and $IDLSUFFIXES variables have been added that make it easier to arrange for additional file suffixes to be scanned by the default Scanners. - A new Flatten() function can be used to turn nested lists of Nodes (or other arguments) into a flat list. - A new --debug=presub option prints the commands to be executed before their construction variables are expanded. - A new .win32 Node attribute will expand file names with Windows backslash path separators on any system. - A new ARGLIST variable makes it possible to fetch keyword=value arguments in the order specified on the command line. - Support has been added for the .dylib shared library suffix and -dynamiclib linker option on Mac OS X (darwin). This release enhances the following existing features: - Environment override keywords can now be passed to the Command() Builder. - An emitter argument to a Builder() can now be a list of emitters that will be called in sequence. - The Java() Builder can now take more than one source directory. - Scanners can now use suffix lists from construction variable expansions. - ParseConfig() now recognizes the -Wa, -Wl, -Wp and -pthread flags and adds them to the appropriate variable(s). - Dir (directory) Nodes can now be be created with user-specified Builder objects. - The SConf.CheckLib() method can now search a list of libraries. - The env.WhereIs() method now takes a "reject" argument to weed out specific path names. - When calling Builders, SCons now issues a warning upon use of the keywords "targets" and "sources", which are virtually always typographic errors that otherwise silently (and confusingly) turn into construction variable overrides. - The $ASCOM, $ASPPCOM, $LINKCOM, $SHLINKCOM, $ARCOM, $LEXCOM and $YACCCOM variables all have wrapper Actions by default. This makes it easier to replace the default print behavior with a custom strfunction(). - Individual tools that create libraries now override the default $LIBPREFIX and $LIBSUFFIX values set by the platform. This makes it easier to use Microsoft Visual Studio tools on a CygWin platform. - If Visual Studio is installed, SCons now assumes its C/C++ compiler, its linker and its MIDL compiler are available, too. - SCons now searches for the ICL license file path name in the external environment and the registry before resorting to the hard-coded path name. - When using Visual Studio, SCons now generates the PDB files at link time, not compile time. - Dependency tracking has been modified to eliminate spurious circular dependencies in certain corner cases involving generated header files, and to avoid rebuilding generated .h files when a #included .h file changes. - The internal Task.make_ready() method now creates a list of the out-of-date Nodes for the task for use by the wrapping interface. - A new single_source keyword argument when creating a Builder enforces a single source file on calls to that Builder. The following fixes have been added: - The CacheDir() directory is now created if it doesn't exist. - Construction variables can now be substituted in $LIBS expansions, and $LIBS expansions now properly ignore null library values. - Construction variables that can be searched for libraries now remove .dll files from the list before feeding the list to Win32 compilers. - All *PATH variables can now expand to include Nodes. - The name of a Scanner.Classic instance is now initialized correctly. - SCons now handles dangling symlinks without generating a stack trace. - env.SourceCode() now works properly when called with an individual file name or Node, not just with a directory name or Node. - SCons now handles the lack of an external PATH environment variable. - Use of $MSVS_IGNORE_IDE_PATHS was broken in 0.95 and is now fixed. - The Command() global function now works properly with string actions; this was broken in 0.95. - A bug introduced in 0.95 in building shared libraries under MinGW has been fixed. - SCons now handles null entries (None or '') in tool lists or CPPPATH. - SCons now handles exceptions in thread-safe ways, according to Pythonic standards. - Error messages have been improved when the evaluation of a construction variable expansion yields a Python syntax error. - File names on command lines are now escaped properly when the expansion is concatenated with another string. Performance has been improved as follows: - Node creation has been sped up when calling a Builder by comparing whether environments are the same object, not whether they have equivalent construction variables. - File system Nodes now cache their generated string values after we've finished reading the SConscript() files. - Node lookup has been made slightly more efficient. - Deleting parents' implicit dependencies after a Node has been built has been made more efficient. The documentation has been improved: - The User's Guide has had the following chapters and sections added: A chapter describing how to install Python and SCons; a section describing the declarative nature of SCons functions in SConscript files; a chapter describing File and Directory Nodes and the return values from Builders; a chapter describing the SConf (Autoconf-like) functionality; a chapter describing Java builds. - The early chapters of the User's Guide have been reorganized to better explain concepts for new users (based on input from Robert P. J. Day, many thanks). - User's Guide fixes: the signatures of the various example *Options() calls; triple-quote properly a multi-line Split() example. - Man page additions: an example and explanation of how to use "tools = ['default', ..." when creating a construction environment; a section describing File and Directory Nodes and some of their attributes and methods; a section describing use of the target_factory and source_factory keyword arguments when creating Builder objects. - Man page fixes: formatting typos, misspellings, fix a bad example. ABOUT SCONS Distinctive features of SCons include: - a global view of all dependencies; no multiple passes to get everything built properly - configuration files are Python scripts, allowing the full use of a real scripting language to solve difficult build problems - a modular architecture allows the SCons Build Engine to be embedded in other Python software - the ability to scan files for implicit dependencies (#include files); - improved parallel build (-j) support that provides consistent build speedup regardless of source tree layout - use of MD5 signatures to decide if a file has really changed; no need to "touch" files to fool make that something is up-to-date - easily extensible through user-defined Builder and Scanner objects - build actions can be Python code, as well as external commands An scons-users mailing list is available for those interested in getting started using SCons. You can subscribe at: http://lists.sourceforge.net/lists/listinfo/scons-users Alternatively, we invite you to subscribe to the low-volume scons-announce mailing list to receive notification when new versions of SCons become available: http://lists.sourceforge.net/lists/listinfo/scons-announce ACKNOWLEDGEMENTS Special thanks to Chad Austin, Charles Crain, Tom Epperly, Ralf W. Grosse-Kunstleve, Jonathan Gurley, Bob Halley, Chris Hoeppler, James Juhasz, Chris Murray, Gary Oberbrunner, Simon Perkins, Kevin Quick, Anthony Roach, sam th and Christoph Wiedemann for their contributions to this release. On behalf of the SCons team, --SK

1 0

Python Success Stories Update
by Stephan Deibel 18 Aug '04

18 Aug '04

Hi, I just wanted to let y'all know that the Python Success Stories collection has nine new additions: http://www.pythonology.com/success These 28 stories include significant testimonials that can make it easier to sell technical decision-makers (i.e., your boss) on Python. Whether you're building an online singles community or an air traffic control system -- be sure to check it out! Also In Print ------------- Twelve stories, including the new ones, have been included in the second O'Reilly Python Success Stories booklet, which recently went into print and should be available at O'Reilly exhibit booths at conferences. Thanks, Stephan Deibel -- Wingware Wing IDE for Python Advancing Software Development www.wingware.com

1 0

Dr. Dobb's Python-URL! - weekly Python news and links (Aug 18)
by Peter Otten 18 Aug '04

18 Aug '04

QOTW "Implementations are always preferred over rhetoric." - Robert Brewer "The programmers you'll be able to hire to work on a Java project won't be as smart as the ones you could get to work on a project written in Python." - Paul Graham http://www.paulgraham.com/gh.html Colin J. Williams shows Mizrandir how to subclass numarray's arrays. http://groups.google.com/groups?threadm=df3955c3.0408140908.1b9bfb63%40post… Hoang Do receives various suggestions how to drop into the interpreter from a running script. http://groups.google.com/groups?threadm=mailman.1679.1092569474.5135.python… Kyle Root asks for help arranging a dependency tree of Python modules and receives both theoretical background information on the problem and code implementing a "topological sort". http://groups.google.com/groups?threadm=6ccff37a.0408111831.6eb25a4e%40post… Timothy Fitz starts a discussion of the differences between Python's generators (an overwhelming success) and coroutines. http://groups.google.com/groups?threadm=972ec5bd.0408141032.385fe115%40post… Fazer learns that he has competition in the area of scripts that retrieve weather forecasts from the web. http://groups.google.com/groups?threadm=6491b0ab.0408121917.5103b770%40post… Coming from a C++ background, Olivier Parisy feels uneasy with the use of exceptions to control program flow in non-exceptional situations. Peter Hansen and several others tell him not to worry. http://groups.google.com/groups?threadm=411775aa%240%2417867%24626a14ce%40n… Roman Suzi has a clear vision of Python 3.0's design process in 2015. http://groups.google.com/groups?selm=mailman.1672.1092553249.5135.python-li… We resist all urges to say more about decorators or white space. ======================================================================== Everything Python-related you want is probably one or two clicks away in these pages: Python.org's Python Language Website is the traditional center of Pythonia http://www.python.org Notice especially the master FAQ http://www.python.org/doc/FAQ.html PythonWare complements the digest you're reading with the marvelous daily python url http://www.pythonware.com/daily Mygale is a news-gathering webcrawler that specializes in (new) World-Wide Web articles related to Python. http://www.awaretek.com/nowak/mygale.html While cosmetically similar, Mygale and the Daily Python-URL are utterly different in their technologies and generally in their results. comp.lang.python.announce announces new Python software. Be sure to scan this newsgroup weekly. http://groups.google.com/groups?oi=djq&as_ugroup=comp.lang.python.announce Brett Cannon continues the marvelous tradition established by Andrew Kuchling and Michael Hudson of intelligently summarizing action on the python-dev mailing list once every other week. http://www.python.org/dev/summary/ The Python Package Index catalogues packages. http://www.python.org/pypi/ The somewhat older Vaults of Parnassus ambitiously collects references to all sorts of Python resources. http://www.vex.net/~x/parnassus/ Much of Python's real work takes place on Special-Interest Group mailing lists http://www.python.org/sigs/ The Python Business Forum "further[s] the interests of companies that base their business on ... Python." http://www.python-in-business.org The Python Software Foundation (PSF) has replaced the Python Consortium as an independent nexus of activity. It has official responsibility for Python's development and maintenance. http://www.python.org/psf/ Among the ways you can support PSF is with a donation. http://www.python.org/psf/donate.html Cetus collects Python hyperlinks. http://www.cetus-links.org/oo_python.html Python FAQTS http://python.faqts.com/ The Cookbook is a collaborative effort to capture useful and interesting recipes. http://aspn.activestate.com/ASPN/Cookbook/Python Among several Python-oriented RSS/RDF feeds available are http://www.python.org/channews.rdf http://bootleg-rss.g-blog.net/pythonware_com_daily.pcgi http://python.de/backend.php For more, see http://www.syndic8.com/feedlist.php?ShowMatch=python&ShowStatus=all The old Python "To-Do List" now lives principally in a SourceForge reincarnation. http://sourceforge.net/tracker/?atid=355470&group_id=5470&func=browse http://python.sourceforge.net/peps/pep-0042.html The online Python Journal is posted at pythonjournal.cognizor.com. editor(a)pythonjournal.com and editor(a)pythonjournal.cognizor.com welcome submission of material that helps people's understanding of Python use, and offer Web presentation of your work. *Py: the Journal of the Python Language* http://www.pyzine.com Archive probing tricks of the trade: http://groups.google.com/groups?oi=djq&as_ugroup=comp.lang.python&num=100 http://groups.google.com/groups?meta=site%3Dgroups%26group%3Dcomp.lang.pyth… Previous - (U)se the (R)esource, (L)uke! - messages are listed here: http://www.ddj.com/topics/pythonurl/ http://purl.org/thecliff/python/url.html (dormant) or http://groups.google.com/groups?oi=djq&as_q=+Python-URL!&as_ugroup=comp.lan… Suggestions/corrections for next week's posting are always welcome. E-mail to <Python-URL(a)phaseit.net> should get through. To receive a new issue of this posting in e-mail each Monday morning (approximately), ask <claird(a)phaseit.net> to subscribe. Mention "Python-URL!". -- The Python-URL! Team-- Dr. Dobb's Journal (http://www.ddj.com) is pleased to participate in and sponsor the "Python-URL!" project.

1 0

ANN: Python Decrypt PDF script -- builds on pdftools
by follower＠gmail.com 17 Aug '04

17 Aug '04

Hi, I wanted to extract the meta-data from an encrypted/protected PDF file and could not find any Python scripts to do this. So, I decided to write something myself, the result follows. This demonstration utility requires the `pdftools` files from <http://www.boddie.org.uk/david/Projects/Python/pdftools/> but the decryption functions themselves should be usable with other Python PDF libraries. Documentation is marginal and all I can say is that worked on the three PDF files I tested it on... :-) --Phil. P.S. The usual Usenet-mangling warning applies--yeah, I know--I should put it up on a web site somewhere... :-) #!/usr/bin/python # # Decrypt PDF Info # # Decrypts PDF files and displays meta-data associated with them. (If the # file isn't encrypted the information is displayed as is.) # # The results are similar to xpdf's `pdfinfo` utility. # # It should be possible to decrypt all of the objects contained # in the PDF, but this only reads the Document Information Dictionary. # # (Note: All the PDF handling is provided by `pdftools`, this just adds # the ability to deal with encrypted PDF files.) # # Requires: # + pdftools # <http://www.boddie.org.uk/david/Projects/Python/pdftools/> # # Based on: # + `pdfdecrypt.pl` # <http://www-2.cs.cmu.edu/~dst/Adobe/Gallery/pdfdecrypt.pl> [PDFPL] # # Incorporates: # + RC4 from CipherSaber implementation by Ka-Ping Yee <ping(a)lfw.org> # <http://www.xs4all.nl/~cg/ciphersaber/comp/python.txt> # # References: # + <http://www-2.cs.cmu.edu/~dst/Adobe/Gallery/anon21jul01-pdf-encryption.txt> [PDFE] # # Author: # follower(a)myrealbox.com (Standing on *many* shoulders...) # import sys import md5 import struct from pdftools import PDFdocument def arcfour(input, key): """ Perform the ARCFOUR (RC4) algorithm on a given input list of bytes with a key given as a list of bytes, and return the output as a list of bytes. (From CipherSaber implementation by Ka-Ping Yee <ping(a)lfw.org> <http://www.xs4all.nl/~cg/ciphersaber/comp/python.txt>) """ i, j, state = 0, 0, range(256) for i in range(256): j = (j + state[i] + key[i % len(key)]) % 256 state[i], state[j] = state[j], state[i] i, j, output = 0, 0, [] for byte in input: i = (i + 1) % 256 j = (j + state[i]) % 256 state[i], state[j] = state[j], state[i] n = (state[i] + state[j]) % 256 output.append(byte ^ state[n]) return output _passwordPad = [ 0x28, 0xbf, 0x4e, 0x5e, 0x4e, 0x75, 0x8a, 0x41, 0x64, 0x00, 0x4e, 0x56, 0xff, 0xfa, 0x01, 0x08, 0x2e, 0x2e, 0x00, 0xb6, 0xd0, 0x68, 0x3e, 0x80, 0x2f, 0x0c, 0xa9, 0xfe, 0x64, 0x53, 0x69, 0x7a] passwordPad = "".join([chr(b) for b in _passwordPad]) def calculateFileKey(fileId, ownerHash, userHash, permissions, userPassword = ""): """ Calculates the file key for the document as described in references (see [PDFE] and [PDFPL]). """ md = md5.new() md.update((userPassword + passwordPad)[:32]) md.update(ownerHash) md.update(struct.pack("<L", permissions)) md.update(fileId) fileKey = md.digest()[:5] return fileKey def calculateObjectKey(fileKey, objectNumber, generationNumber): """ Calculates the key for the object as described in references (see [PDFE] and [PDFPL]). """ md = md5.new() md.update(fileKey) md.update(struct.pack("<L", objectNumber)[:3]) md.update(struct.pack("<L", generationNumber)[:2]) objectKey = md.digest()[:10] return objectKey class NotEncryptedException(Exception): """ The supplied PDF document is not encrypted. """ KEY_OWNER_HASH = 'O' KEY_USER_HASH = 'U' KEY_PERMISSIONS = 'P' def getFileKey(doc, userPassword = ""): """ Extracts the information required to calculate the file key from the supplied PDF document. In most cases `userPassword` can be left empty. """ fileId = doc.trailer_dict['ID'][0] # Is the ID always repeated? try: encryptDict = doc.dereference(doc.trailer_dict['Encrypt']) except KeyError: raise NotEncryptedException # TODO: Check encryption version is ok. (filter/standard/v/1/r/2) ownerHash = encryptDict[KEY_OWNER_HASH] userHash = encryptDict[KEY_USER_HASH] # `permissions` should be "four-byte integer, LSB first." permissions = encryptDict[KEY_PERMISSIONS] fileKey = calculateFileKey(fileId, ownerHash, userHash, permissions, userPassword) # Sanity check user password assert(decrypt(userHash, fileKey) == passwordPad) return fileKey def decrypt(text, key): """ Decrypts the supplied object (as a string) with the supplied key. Returns "plain text" form of object as a string. """ return "".join([chr(b) for b in arcfour(map(ord, text), map(ord, key))]) def showDocumentInfo(doc, fileKey): """ Displays the content of the (optionally encrypted) Document Information Dictionary for the supplied PDF document. """ infoDictRef = doc.trailer_dict['Info'] objectNumber = infoDictRef.obj generationNumber = infoDictRef.gen infoDict = doc.dereference(infoDictRef) objectKey = calculateObjectKey(fileKey, objectNumber, generationNumber) for field, encryptedValue in infoDict.iteritems(): if fileKey: value = decrypt(encryptedValue, objectKey) else: value = encryptedValue print "%s: %s" % (field, value) if __name__ == "__main__": try: filename = sys.argv[1] except IndexError: raise SystemExit("Usage %s <filename.pdf>" % sys.argv[0]) doc = PDFdocument(filename) try: fileKey = getFileKey(doc) except NotEncryptedException: fileKey = "" showDocumentInfo(doc, fileKey)

1 0

ANN: Python Decrypt PDF script -- builds on pdftools
by follower＠gmail.com 17 Aug '04

17 Aug '04

Hi, I wanted to extract the meta-data from an encrypted/protected PDF file and could not find any Python scripts to do this. So, I decided to write something myself, the result follows. This demonstration utility requires the `pdftools` files from <http://www.boddie.org.uk/david/Projects/Python/pdftools/> but the decryption functions themselves should be usable with other Python PDF libraries. Documentation is marginal and all I can say is that worked on the three PDF files I tested it on... :-) --Phil. P.S. The usual Usenet-mangling warning applies--yeah, I know--I should put it up on a web site somewhere... :-) #!/usr/bin/python # # Decrypt PDF Info # # Decrypts PDF files and displays meta-data associated with them. (If the # file isn't encrypted the information is displayed as is.) # # The results are similar to xpdf's `pdfinfo` utility. # # It should be possible to decrypt all of the objects contained # in the PDF, but this only reads the Document Information Dictionary. # # (Note: All the PDF handling is provided by `pdftools`, this just adds # the ability to deal with encrypted PDF files.) # # Requires: # + pdftools # <http://www.boddie.org.uk/david/Projects/Python/pdftools/> # # Based on: # + `pdfdecrypt.pl` # <http://www-2.cs.cmu.edu/~dst/Adobe/Gallery/pdfdecrypt.pl> [PDFPL] # # Incorporates: # + RC4 from CipherSaber implementation by Ka-Ping Yee <ping(a)lfw.org> # <http://www.xs4all.nl/~cg/ciphersaber/comp/python.txt> # # References: # + <http://www-2.cs.cmu.edu/~dst/Adobe/Gallery/anon21jul01-pdf-encryption.txt> [PDFE] # # Author: # follower(a)myrealbox.com (Standing on *many* shoulders...) # import sys import md5 import struct from pdftools import PDFdocument def arcfour(input, key): """ Perform the ARCFOUR (RC4) algorithm on a given input list of bytes with a key given as a list of bytes, and return the output as a list of bytes. (From CipherSaber implementation by Ka-Ping Yee <ping(a)lfw.org> <http://www.xs4all.nl/~cg/ciphersaber/comp/python.txt>) """ i, j, state = 0, 0, range(256) for i in range(256): j = (j + state[i] + key[i % len(key)]) % 256 state[i], state[j] = state[j], state[i] i, j, output = 0, 0, [] for byte in input: i = (i + 1) % 256 j = (j + state[i]) % 256 state[i], state[j] = state[j], state[i] n = (state[i] + state[j]) % 256 output.append(byte ^ state[n]) return output _passwordPad = [ 0x28, 0xbf, 0x4e, 0x5e, 0x4e, 0x75, 0x8a, 0x41, 0x64, 0x00, 0x4e, 0x56, 0xff, 0xfa, 0x01, 0x08, 0x2e, 0x2e, 0x00, 0xb6, 0xd0, 0x68, 0x3e, 0x80, 0x2f, 0x0c, 0xa9, 0xfe, 0x64, 0x53, 0x69, 0x7a] passwordPad = "".join([chr(b) for b in _passwordPad]) def calculateFileKey(fileId, ownerHash, userHash, permissions, userPassword = ""): """ Calculates the file key for the document as described in references (see [PDFE] and [PDFPL]). """ md = md5.new() md.update((userPassword + passwordPad)[:32]) md.update(ownerHash) md.update(struct.pack("<L", permissions)) md.update(fileId) fileKey = md.digest()[:5] return fileKey def calculateObjectKey(fileKey, objectNumber, generationNumber): """ Calculates the key for the object as described in references (see [PDFE] and [PDFPL]). """ md = md5.new() md.update(fileKey) md.update(struct.pack("<L", objectNumber)[:3]) md.update(struct.pack("<L", generationNumber)[:2]) objectKey = md.digest()[:10] return objectKey class NotEncryptedException(Exception): """ The supplied PDF document is not encrypted. """ KEY_OWNER_HASH = 'O' KEY_USER_HASH = 'U' KEY_PERMISSIONS = 'P' def getFileKey(doc, userPassword = ""): """ Extracts the information required to calculate the file key from the supplied PDF document. In most cases `userPassword` can be left empty. """ fileId = doc.trailer_dict['ID'][0] # Is the ID always repeated? try: encryptDict = doc.dereference(doc.trailer_dict['Encrypt']) except KeyError: raise NotEncryptedException # TODO: Check encryption version is ok. (filter/standard/v/1/r/2) ownerHash = encryptDict[KEY_OWNER_HASH] userHash = encryptDict[KEY_USER_HASH] # `permissions` should be "four-byte integer, LSB first." permissions = encryptDict[KEY_PERMISSIONS] fileKey = calculateFileKey(fileId, ownerHash, userHash, permissions, userPassword) # Sanity check user password assert(decrypt(userHash, fileKey) == passwordPad) return fileKey def decrypt(text, key): """ Decrypts the supplied object (as a string) with the supplied key. Returns "plain text" form of object as a string. """ return "".join([chr(b) for b in arcfour(map(ord, text), map(ord, key))]) def showDocumentInfo(doc, fileKey): """ Displays the content of the (optionally encrypted) Document Information Dictionary for the supplied PDF document. """ infoDictRef = doc.trailer_dict['Info'] objectNumber = infoDictRef.obj generationNumber = infoDictRef.gen infoDict = doc.dereference(infoDictRef) objectKey = calculateObjectKey(fileKey, objectNumber, generationNumber) for field, encryptedValue in infoDict.iteritems(): if fileKey: value = decrypt(encryptedValue, objectKey) else: value = encryptedValue print "%s: %s" % (field, value) if __name__ == "__main__": try: filename = sys.argv[1] except IndexError: raise SystemExit("Usage %s <filename.pdf>" % sys.argv[0]) doc = PDFdocument(filename) try: fileKey = getFileKey(doc) except NotEncryptedException: fileKey = "" showDocumentInfo(doc, fileKey)

1 0