Python-announce-list July 2003

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ANN: SciParam 1.0.0
by Thomas Koester 29 Sep '03

29 Sep '03

SciParam 1.0.0 is a Python package to easily add additional quality control for entering scientific parameters in wxPython-based user interfaces. See http://great-er.intevation.org/sciparam/ for download, documentation and screenshots. License ======= Copyright (C) 2002, 2003 Intevation GmbH <intevation(a)intevation.de> Georgstrasse 4 D-49074 Osnabrueck Germany Author: Thomas Koester <tkoester(a)intevation.de> After my wedding on July 30th, 2003: Thomas Arendsen Hein <thomas(a)intevation.de> SciParam is released under the GNU General Public License. -- Email: rufus(a)o-town.de (at work: tkoester(a)intevation.de) http://rufus.o-town.de/

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ANN: PyTables 0.7 released
by Francesc Alted 31 Jul '03

31 Jul '03

Announcing PyTables 0.7 ----------------------- PyTables is a hierarchical database package designed to efficently manage very large amounts of data. PyTables is built on top of the HDF5 library and the numarray package and features an object-oriented interface that, combined with C-code generated from Pyrex sources, makes it a fast, yet extremely easy to use tool for interactively save and retrieve large amounts of data. Release 0.7 is the third public beta release. The version 0.6 was internal and will never be released. On this release you will find: - new AttributeSet class - 25% I/O speed improvement - fully multidimensional table cells support - new column descriptors - row deletion in tables is finally here - much more! More in detail: What's new ----------- - A new AttributeSet class has been added. This will allow the addition and deletion of generic attributes (any scalar type plus any Python object supported by Pickle) as easy as this: table.attrs.date = "2003/07/28 10:32" # Attach a string to table group._v_attrs.tempShift = 1.2 # Attach a float to group array.attrs.detectorList = [1,2,3,4] # Attach a list to array del array.attrs.detectorList # Detach detectorList attr from array - PyTables now has support for fully multidimensional table cells. This has been made possible in part by implementation of multidimensional cells in numarray.records.RecArray object. Thanks to numarray crew, and especially to Jin-chung Hsu, for willingly accepting to do that, and also for including some cache improvements in RecArray. - New column descriptors added: IntCol, Int8Col, UInt8Col, Int16Col, UInt16Col, Int32Col, UInt32Col, Int64Col, UInt64Col, FloatCol, Float32Col, Float64Col and StringCol. I think they are more explicit and easy-to-use than the now deprecated (but still supported) Col() descriptor. All the examples and user's manual has been accordingly updated. - The new Table.removeRows(start, stop) function allows you to remove rows from tables. This feature was requested a long time ago. There are still limitations, however: you cannot delete rows in extremely large Tables (as the remaining rows after the stop parameter are stored in memory). Nor is the performance optimized. These issues will hopefully be addressed in future releases. - Added iterators to File, Group and Table (they now support the special __iter__() method). They make the object much more user-friendly, especially in interactive mode. See documentation for usage examples. - Added a __getitem__() method to Table that works more or less like read(), but with extended slices support. - As a consequence of rewriting table iterators in C (with the help of Pyrex, of course) the table read performance has been improved between 20% and 30%. Data selections in PyTables are now starting to beat powerful relational databases like SQLite, even compared to in-core selects (!). I think there is still room for another 20% or 30% speed improvement, so stay tuned. - A checksum is now added automatically when using LZO (not with UCL where I'm having some difficulties implementing that capability). The Adler32 algorithm has been chosen because of its speed. With that, the compressing/decompressing speed has dropped 1% or 2%, which is hardly noticeable. I think this addition will allow the cautious user to be a bit more confident about this excellent compressor. Code has been added to be able to read files created without this checksum (so you can be confident that you will be able to read your existing files compressed with LZO and UCL). - Recursion has been removed from PyTables. Before, this made the maximum depth tree to be less than the Python recursion limit (which depends on implementation, but is around 900, at least in Linux). Now, the limit has been set (somewhat arbitrarily) at 2048. Thanks to John Nielsen for implementing the new iterative method!. - A new rootUEP parameter to openFile() has been added. You can now define the root from which you want to start to build the object tree. Thanks to John Nielsen for the suggestion and a first implementation. - A small bug fixed when dealing with non-native PyTables files that prevented the use of the "classname" filter during a listNodes() call. Thanks to Jeff Robbins for reporting that. - Some (non-serious) bugs were discovered and fixed. - Updated documentation to explain all these new bells and whistles. It is also available on the web: http://pytables.sourceforge.net/html-doc/usersguide-html.html - Added more unit tests (more than 350 now!) - PyTables 0.7 *needs* numarray 0.6 or higher and HDF-1.6.0 or higher to compile and work. It has been tested with Python 2.2 and 2.3 and should work fine on both versions. What is a table? ---------------- A table is defined as a collection of records whose values are stored in fixed-length fields. All records have the same structure and all values in each field have the same data type. The terms "fixed-length" and "strict data types" seems to be quite a strange requirement for an language like Python, that supports dynamic data types, but they serve a useful function if the goal is to save very large quantities of data (such as is generated by many scientific applications, for example) in an efficient manner that reduces demand on CPU time and I/O resources. What is HDF5? ------------- For those people who know nothing about HDF5, it is is a general purpose library and file format for storing scientific data made at NCSA. HDF5 can store two primary objects: datasets and groups. A dataset is essentially a multidimensional array of data elements, and a group is a structure for organizing objects in an HDF5 file. Using these two basic constructs, one can create and store almost any kind of scientific data structure, such as images, arrays of vectors, and structured and unstructured grids. You can also mix and match them in HDF5 files according to your needs. Platforms --------- I'm using Linux as the main development platform, but PyTables should be easy to compile/install on other UNIX machines. This package has also passed all the tests on a UltraSparc platform with Solaris 7 and Solaris 8. It also compiles and passes all the tests on a SGI Origin2000 with MIPS R12000 processors and running IRIX 6.5. Regarding Windows platforms, PyTables has been tested with Windows 2000 and Windows XP, but it should also work with other flavors. An example? ----------- For online code examples, have a look at http://pytables.sourceforge.net/tut/tutorial1-1.html and http://pytables.sourceforge.net/tut/tutorial1-2.html Web site -------- Go to the PyTables web site for more details: http://pytables.sourceforge.net/ Share your experience --------------------- Let me know of any bugs, suggestions, gripes, kudos, etc. you may have. Have fun! -- Francesc Alted falted(a)openlc.org

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HarvestMan 1.1
by pythonguy＠Hotpop.com 31 Jul '03

31 Jul '03

HarvestMan, is a mulyithreaded, highly customizable command line offline browser written completely in python. It allows one to download websites or specific files from websites to the hard disk for offline browsing. The project page is situated at http://members.lycos.co.uk/anandpillai. Version 1.1 with many changes, fixes and updates is available for download and review. Freshmeat: http://www.freshmeat.net/projects/harvestman Thanks to everyone who used the program, reviewed it and sent in their suggestions. ~Anand Pillai

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dnspython 1.1.0b2
by Bob Halley 31 Jul '03

31 Jul '03

dnspython 1.1.0b2 has been released; here's the README file: INTRODUCTION dnspython is a DNS toolkit for Python. It supports almost all record types. It can be used for queries, zone transfers, and dynamic updates. It supports TSIG authenticated messages and EDNS0. dnspython provides both high and low level access to DNS. The high level classes perform queries for data of a given name, type, and class, and return an answer set. The low level classes allow direct manipulation of DNS zones, messages, names, and records. To see a few of the ways dnspython can be used, look in the examples/ directory. dnspython originated at Nominum where it was developed to facilitate the testing of DNS software. Nominum has generously allowed it to be open sourced under a BSD-style license, and helps support its future development by continuing to employ the author :). ABOUT THIS RELEASE This is dnspython 1.1.0b2. New in this release: Zones now have find_rrset() and find_rdataset() convenience methods. They let you retrieve rdata with the specified name and type in one call, e.g.: rrset = zone.find_rrset('foo', 'mx') Nodes no longer have names; owner names are associated with nodes in the Zone object's nodes dictionary. (It is my hope that this is the last non-backwards compatible change that will be made to the API.) The Zone class now implements more of the standard mapping interface. E.g. you can say zone.keys(), zone.get('name'), zone.iteritems(), etc. __iter__() has been changed to iterate the keys rather than values to match the standard mapping interface's behavior. The IPv6 version of inet_ntoa now emits embedded IPv4 addresses using the preferred syntax. This release fixes all known bugs from 1.1.0b1. See the ChangeLog file for more detailed information on changes since the prior release. REQUIREMENTS Python 2.2 or later. INSTALLATION To build and install dnspython, type python setup.py install HOME PAGE For the latest in releases, documentation, and information, visit the dnspython home page at http://www.dnspython.org/ DOCUMENTATION Documentation is sparse at the moment. Use pydoc, or read the HTML documentation at the dnspython home page, or download the HTML documentation. BUG REPORTS Bug reports may be sent to bugs(a)dnspython.org MAILING LISTS A number of mailing lists are available. Visit the dnspython home page to subscribe or unsubscribe.

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urllib(2) and https blues? try pytunnel for python tunnelling
by pyguy30＠yahoo.com 30 Jul '03

30 Jul '03

The python libraries like urllib and httplib do not support ssl through a proxy. Urllib2 supports http through a proxy or https alone, but not https through a proxy. A while ago my wife complained to me that perl had trouble w/https. I was surprised since perl has a lot of networking libraries. Preferring python, I took a look a python and found the same problem. Eventually I figured out what python was missing: tunnelling. Though she may _coax_ me to port the code to perl, I'm writing it first in my favorite language. Pytunnel offers a tunnel that can be used for (among other things) tunnelling the ssl through a proxy. I'd be willing to offer suggestions or myself add the necessary code to urllib2. Anyone know how one goes about doing either? Your python code does not need to be changed except that the port and ip are supplied by the tunnel. Pytunnel uses a custom recvall which is like sendall but for recv. Recvall uses non-blocking sockets,timeouts and sleeps to attempt to get all of the data. If you have a bad network connection you'd want to set the timeout to be high. Recvall will probably be slower than a standard recvall. The code is rough and needs better error handling, comments and such. But since I got it working I decided to post it. You can find it at: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/213238 Example of usage: import pytunnel,httplib def tunnel_this(ip,port): conn = httplib.HTTPSConnection(ip,port=port) conn.putrequest('GET', '/') conn.endheaders() response = conn.getresponse() print response.read() tunnel=pytunnel.build(host='login.yahoo.com',proxy_host='h1',proxy_user='u',proxy_pass='p') tunnel.run(tunnel_this)

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PyXML 0.8.3 is released
by Martin von Löwis 30 Jul '03

30 Jul '03

Version 0.8.3 of the Python/XML distribution is now available. It should be considered a beta release, and can be downloaded from the following URLs: http://prdownloads.sourceforge.net/pyxml/PyXML-0.8.3.tar.gz http://prdownloads.sourceforge.net/pyxml/PyXML-0.8.3.win32-py2.2.exe http://prdownloads.sourceforge.net/pyxml/PyXML-0.8.3.win32-py2.3.exe http://prdownloads.sourceforge.net/pyxml/PyXML-0.8.3-2.2.Suse82.i386.rpm Changes in this version, compared to 0.8.2: * Fix memory leak in Expat bindings (content model information provided by Expat was not freed as required). * New convenience classes in the xml.ns module: ClosedNamespace, OpenNamespace. * The symbol "_" is no longer inserted into the built-in namespace via the gettext module; I18N support is no longer invasive. * expatreader now implements feature_namespace_prefixes. * drv_xmlproc now supports EntityResolvers that return system IDs. * Various bugs have been fixed: 677768: 0.8.2 setup.py errors on OS X 684522: ns_parse parsing error for ampersands in description field 696457: public/system ID swapped [in expatreader] 725010: Script text not contained in script element 728810: Forgotten print statement [in wddx] 733890: Memory Leak in expatparser.py 757799: Correct XmlWriter.processingInstruction() 765249: Problems building PyXML 0.8.2 on MacOSX 767130: Invalid charset breaks installation with Python 2.3(beta) [4DOM] 774091: minidom CharacterData string methods fail when offset=length 774095: minidom hasAttributes method only available on Element 774100: minidom removeAttributeNode return value 774104: minidom setNamedItem unlinks replaced attributes 774108: 4DOM setAttributeNode[NS] setting attribute already on node The Python/XML distribution contains the basic tools required for processing XML data using the Python programming language, assembled into one easy-to-install package. The distribution includes parsers and standard interfaces such as SAX and DOM, along with various other useful modules. The package currently contains: * XML parsers: Pyexpat (Jack Jansen), xmlproc (Lars Marius Garshol), sgmlop (Fredrik Lundh). * SAX interface (Lars Marius Garshol) * minidom DOM implementation (Paul Prescod, others) * 4DOM and 4XPath from Fourthought (Uche Ogbuji, Mike Olson) * Schema implementations: TREX (James Tauber) * Various utility modules and functions (various people) * Documentation and example programs (various people) The code is being developed bazaar-style by contributors from the Python XML Special Interest Group, so please send comments and questions to <xml-sig(a)python.org>. Bug reports may be filed on SourceForge: http://sourceforge.net/tracker/index.php?group_id=6473&atid=106473 For more information about Python and XML, see: http://www.python.org/topics/xml/ -- Martin v. Löwis http://loewis.de/martin

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mxCGIPython 2.3 binaries for Linux, Solaris and FreeBSD
by Oleg Broytmann 30 Jul '03

30 Jul '03

Hello! I just uploaded new mxCGIPython binaries to http://phd.pp.ru/Software/Python/misc/mxCGI/ Python 2.3, mxCGI 0.7.0. Operating systems: Debian GNU/Linux 3.0, gcc 3.2.1 FreeBSD 4.8, gcc 2.95.4 Solaris 2.8 (SunOS 5.8), gcc 2.95.3. Oleg. -- Oleg Broytmann http://phd.pp.ru/ phd(a)phd.pp.ru Programmers don't die, they just GOSUB without RETURN.

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pyFLTK-1.1.b1
by a.held＠computer.org 29 Jul '03

29 Jul '03

The first beta release of the Python bindings for the FLTK toolkit is now ready for download from http://pyfltk.sourceforge.net. FLTK is a lightweight cross-platform (Windows, Linux, Unix, Mac) GUI toolkit, available from http://www.fltk.org. Changes since pyFLTK-1.1.a1 include: - Updated documentation. - No need to set thiswon=0 anymore. - Fixed bug that caused stack overflow on handling polymorphisms. - Added polymorphism for Fl_Overlay_Window.draw_overlay. - Added polymorphism for Fl_Widget.handle. - Added polymorphism for Fl_Box.draw(). - Added polymorphism for Fl_Single_Window.draw() and Fl_Double_Window.draw(). - Added method getScrollbar to Fl_Scroll and Fl_Browser_. - Applied patch 742665 (thanks to Jerome Laheurte). - Fixed bug (patch) 745651. - Cleaned up enums for boxtypes. - Fixed bug in Fl_Adjuster that prevented updating. - Added contrib/ListSelect. - Created new cross-platform (Windows and Linux) setup script setup.py. - Fixed and expanded test files. Please direct all bug reports and feature requests to the mailing list: pyfltk-user at lists dot sourceforge dot net. Regards Andreas Held pyfltk.sourceforge.net

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RELEASED Python 2.3 (final)
by barry＠python.org 29 Jul '03

29 Jul '03

On behalf of the Python development team and the Python community, I'm happy to announce the release of Python 2.3 (final). Nineteen months in the making, Python 2.3 represents a commitment to stability and improved performance, with a minimum of new language features. Countless bugs and memory leaks have been fixed, many new and updated modules have been added, and the new type/class system introduced in Python 2.2 has been significantly improved. Python 2.3 can be up to 30% faster than Python 2.2. For more information on Python 2.3, including download links for various platforms, release notes, and known issues, please see: http://www.python.org/2.3 Highlights of this new release include: - A brand new version of IDLE, the Python IDE, from the IDLEfork project at SourceForge. - Many new and improved library modules including: sets, heapq, datetime, textwrap, optparse, logging, bsddb, bz2, tarfile, ossaudiodev, itertools, platform, csv, timeit, shelve, DocXMLRPCServer, imaplib, imp, trace, and a new random number generator based on the highly acclaimed Mersenne Twister algorithm (with a period of 2**19937-1). Some obsolete modules have been deprecated. - New and improved built-ins including: o enumerate(): an iterator yielding (index, item) pairs o sum(): a new function to sum a sequence of numbers o basestring: an abstract base string type for str and unicode o bool: a proper type with instances True and False o compile(), eval(), exec: fully support Unicode, and allow input not ending in a newline o range(): support for long arguments (magnitude > sys.maxint) o dict(): new constructor signatures o filter(): returns Unicode when the input is Unicode o int() can now return long o isinstance(), super(): Now support instances whose type() is not equal to their __class__. super() no longer ignores data descriptors, except for __class__. o raw_input(): can now return Unicode objects o slice(), buffer(): are now types rather than functions - Many new doctest extensions, allowing them to be run by unittest. - Extended slices, e.g. "hello"[::-1] returns "olleh". - Universal newlines mode for reading files (converts \r, \n and \r\n all into \n). - Source code encoding declarations. (PEP 263) - Import from zip files. (PEP 273 and PEP 302) - FutureWarning issued for "unsigned" operations on ints. (PEP 237) - Faster list.sort() is now stable. - Unicode filenames on Windows. (PEP 227) - Karatsuba long multiplication (running time O(N**1.58) instead of O(N**2)). - pickle, cPickle, and copy support a new pickling protocol for more efficient pickling of (especially) new-style class instances. - The socket module now supports optional timeouts on all operations. - ssl support has been incorporated into the Windows installer. - Many improvements to Tkinter. Python 2.3 contains many other improvements, including the adoption of many Python Enhancement Proposals (PEPs). For details see: http://www.python.org/2.3/highlights.html Enjoy. happy-50th-birthday-geddy-ly y'rs, -Barry Barry Warsaw barry(a)python.org Python 2.3 Release Manager (and the PythonLabs team: Tim, Fred, Jeremy, and Guido)

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Rebuild 1.0
by Christopher Nelson 29 Jul '03

29 Jul '03

Rebuild is a python module that replaces make. It is not a drop-in replacement, and does not use "makefiles." Instead, it includes a number of modules which try to be more intelligent about building projects. Rebuild is reasonably stable, as I have been using it for my own projects for the past year or so. Obviously it will contain problems that I have not run into yet. Questions and bug reports can be sent to paradox(a)bbhc.org Please put [rebuild] somewhere in the subject line if mailing regarding this project. The homepage for rebuild contains a download link, some documentation, and some examples. It can be found at: http://staff.bbhc.org/christophern/exos/rebuild/index.html Features: +Intelligent parsing heuristics for C/C++ source and headers, as well as nasm assembler source. +Automatic gathering of dependencies for supported languages and a more intelligent build process reduces overall time spent in the building algorithms. +Flexible options and a black-box approach to compilers. +Supports compiling with gcc and nasm. Easily extensible for other compilers. +Supports user-defined actions (Python functions) that can be linked into dependency chains for autobuilding source files like configuration headers. <P><A HREF="http://staff.bbhc.org/christophern/exos/rebuild/rebuild-1.0.zip">R ebuild 1.0</A> - Python make replacement. (July 29, 2003) </p>

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Python-announce-list July 2003