🌐 Mailman 3 October 2002 - Python-list - python.org

AIX installation can't find zlib
by Larry Whitley Nov. 3, 2011

Nov. 3, 2011

I've just installed the 1.5.2 source distribution on an AIX system and when I say "import zlib" it responds: >>> import zlib Traceback (innermost last): File "<stdin>", line 1, in ? ImportError: No module named zlib >>> I'm not sure where zlib is supposed to be. It's not in the Lib subdirectory of Python-1.5.2. In the Modules subdirectory I find zlibmodule.c. Nothing germaine in the Objects subdirectory. Looked at config.log and config.status, no mention of zlib. Looking at the sys.path I see: .../ldw/Python-1.5.2> python Python 1.5.2 (#1, Jul 26 2000, 14:21:56) [C] on aix4 Copyright 1991-1995 Stichting Mathematisch Centrum, Amsterdam >>> import sys >>> sys.path ['', '/.../rchland.ibm.com/fs/u1/ldw/Projects/Programs/wtCache', '/.../rchland.ibm.com/fs/u1/ldw/Python-1.5.2/Lib/', '/.../rchland.ibm.com/fs/u1/ldw/Python-1.5.2/Lib/plat-aix4', '/.../rchland.ibm.com/fs/u1/ldw/Python-1.5.2/Lib/lib-tk', '/.../rchland.ibm.com/fs/u1/ldw/Python-1.5.2/Modules'] >>> Any suggestions? Larry

3 2

TopSort in Python?
by Tim Peters Jan. 21, 2008

Jan. 21, 2008

From: "Tim Peters" <tim_one(a)email.msn.com> [Dinu C. Gherman] > Does anybody have a simple-minded-but-working full-Python > implementation of topsort, the topological sorting algorithm? > Or maybe *any* topsort? I remember only one such algorithm... > python.org/search doesn't reveal any... Searching for "topological" instead turns up two hits there, a few more on DejaNews. Apparently "the std" algorithm I posted years ago predates DejaNews, though. So here's a fancier version ... check-out-aaron's-kjbuckets-too-ly y'rs - tim # topsort takes a list of pairs, where each pair (x, y) is taken to # mean that x <= y wrt some abstract partial ordering. The return # value is a list, representing a total ordering that respects all # the input constraints. # E.g., # topsort( [(1,2), (3,3)] ) # may return any of (but nothing other than) # [3, 1, 2] # [1, 3, 2] # [1, 2, 3] # because those are the permutations of the input elements that # respect the "1 precedes 2" and "3 precedes 3" input constraints. # Note that a constraint of the form (x, x) is really just a trick # to make sure x appears *somewhere* in the output list. # # If there's a cycle in the constraints, say # topsort( [(1,2), (2,1)] ) # then CycleError is raised, and the exception object supports # many methods to help analyze and break the cycles. This requires # a good deal more code than topsort itself! from exceptions import Exception class CycleError(Exception): def __init__(self, sofar, numpreds, succs): Exception.__init__(self, "cycle in constraints", sofar, numpreds, succs) self.preds = None # return as much of the total ordering as topsort was able to # find before it hit a cycle def get_partial(self): return self[1] # return remaining elt -> count of predecessors map def get_pred_counts(self): return self[2] # return remaining elt -> list of successors map def get_succs(self): return self[3] # return remaining elements (== those that don't appear in # get_partial()) def get_elements(self): return self.get_pred_counts().keys() # Return a list of pairs representing the full state of what's # remaining (if you pass this list back to topsort, it will raise # CycleError again, and if you invoke get_pairlist on *that* # exception object, the result will be isomorphic to *this* # invocation of get_pairlist). # The idea is that you can use pick_a_cycle to find a cycle, # through some means or another pick an (x,y) pair in the cycle # you no longer want to respect, then remove that pair from the # output of get_pairlist and try topsort again. def get_pairlist(self): succs = self.get_succs() answer = [] for x in self.get_elements(): if succs.has_key(x): for y in succs[x]: answer.append( (x, y) ) else: # make sure x appears in topsort's output! answer.append( (x, x) ) return answer # return remaining elt -> list of predecessors map def get_preds(self): if self.preds is not None: return self.preds self.preds = preds = {} remaining_elts = self.get_elements() for x in remaining_elts: preds[x] = [] succs = self.get_succs() for x in remaining_elts: if succs.has_key(x): for y in succs[x]: preds[y].append(x) if __debug__: for x in remaining_elts: assert len(preds[x]) > 0 return preds # return a cycle [x, ..., x] at random def pick_a_cycle(self): remaining_elts = self.get_elements() # We know that everything in remaining_elts has a predecessor, # but don't know that everything in it has a successor. So # crawling forward over succs may hit a dead end. Instead we # crawl backward over the preds until we hit a duplicate, then # reverse the path. preds = self.get_preds() from random import choice x = choice(remaining_elts) answer = [] index = {} in_answer = index.has_key while not in_answer(x): index[x] = len(answer) # index of x in answer answer.append(x) x = choice(preds[x]) answer.append(x) answer = answer[index[x]:] answer.reverse() return answer def topsort(pairlist): numpreds = {} # elt -> # of predecessors successors = {} # elt -> list of successors for first, second in pairlist: # make sure every elt is a key in numpreds if not numpreds.has_key(first): numpreds[first] = 0 if not numpreds.has_key(second): numpreds[second] = 0 # if they're the same, there's no real dependence if first == second: continue # since first < second, second gains a pred ... numpreds[second] = numpreds[second] + 1 # ... and first gains a succ if successors.has_key(first): successors[first].append(second) else: successors[first] = [second] # suck up everything without a predecessor answer = filter(lambda x, numpreds=numpreds: numpreds[x] == 0, numpreds.keys()) # for everything in answer, knock down the pred count on # its successors; note that answer grows *in* the loop for x in answer: assert numpreds[x] == 0 del numpreds[x] if successors.has_key(x): for y in successors[x]: numpreds[y] = numpreds[y] - 1 if numpreds[y] == 0: answer.append(y) # following "del" isn't needed; just makes # CycleError details easier to grasp del successors[x] if numpreds: # everything in numpreds has at least one predecessor -> # there's a cycle if __debug__: for x in numpreds.keys(): assert numpreds[x] > 0 raise CycleError(answer, numpreds, successors) return answer

8 9

Win32 drive mapping... aka "net use"
by lshuler＠my-deja.com March 5, 2005

March 5, 2005

Is there an API using Win32 extensions to map a drive share? I have not found one yet and have tried searching "Win32 map drive". I am looking for the equivalent of: net use <share path> If not, is there an alternative other than making a call to system("net use <path>"). Thanks in advance, Lance Sent via Deja.com http://www.deja.com/ Before you buy.

11 15

Gate Oxide thickness of CMOS
by hasi＠rediffmail.com Jan. 2, 2005

Jan. 2, 2005

Hi, I would like to know the following details for a CMOS 1.gate oxide thickness 2.The Number of masks 3.Number of transistors per chip Thanks, Hasi!

3 2

Parsing apache log files
by Fernando Rodr�guez Dec. 21, 2004

Dec. 21, 2004

Is there any module for parsing apache log files? O:-) I guess it could be done with regular expressions, but I'm not very gifted with them... :-) ----------------------- Fernando Rodriguez

2 1

Blank ASP pages
by python Dec. 10, 2004

Dec. 10, 2004

My server is spitting out blank .asp pages which use python. If Python is not declared, the asp pages work fine. I just yesterday stepped up to Python 1.52 and the new win32all After the install, the blanks started appearing. All the paths look fine in registry. Any clues? ( Intel dual PIII 550 Xeon, 1G RAM, NT 4.0 SP 6a, IIS 4) ************************************************** Jason S. Nadler Lead Programmer Channel21 Productions, Inc. ... What are you doing right now? **************************************************

3 2

How your company think about python?
by d2002xx Feb. 4, 2004

Feb. 4, 2004

Hi all. I've posted a similiar message in comp.lang.java.advocacy, just for curious, but it seems that most people don't know about python... Would you tell me how your company (or your boss, colleagues) think about python? A possible next-generation mainstream? Or just another script? Or they even never heard it? Also, If your company wants to create a new software, will you recommand them to use python even if your boss/colleagues don't know about it? How you tell them the benefits from python? Why or why not?

17 20

Dealing with faults matters (was: Is Python dying?)
by claird＠Starbase.NeoSoft.COM Aug. 28, 2003

Aug. 28, 2003

In article <3706f449.12085377(a)news.cybercity.dk>, Morten Christensen <mmc(a)vip.cybercity.dk> wrote: >On 31 Mar 1999 06:01:03 -0600, claird(a)Starbase.NeoSoft.COM (Cameron >Laird) wrote: >>*I* certainly discuss it. Anyone who understands >>that exception-handling is important I invite to >>realize that exception-handling on the sociologi- >>cal-organizational dimension has an even bigger >>multiplier. >> >>This is a plank of my "Visual C considered profes- >>sional malpractice" campaign. > >??? > >...I understand exception handling and regard it as very important, >although the (Visual) C++ implementation is really awful (as everyone >who have experienced "unexplainable" Visual C++ exceptions of unknown >origin and type knows ).... I also know a lot about how exception >handling is actually implemented in modern OO languages such as C++ >(this was the subject I wrote my master thesis on).... > >HOWEVER, I have NO clue about what you mean by exception-handling as a >multiplier on the sociological-organization dimension :-) I would like >to find out. Can you explain? . . . Happily. Excuse my giddiness, please; I see that that last message *did* wander too far into the land of obscurity. Here's what I was saying: exception-handling is important. Programs that intelligently use exception-handling mechanisms are better programs. Exception-handling is even more important to people. People and organizations that deal with exceptions intelligently, and don't pre- tend that everything should be without fault, are better people and organizations. In fact, a correct computer program often has over half its lines devoted to accomo- dating error. A wise person will have good ways to respond to criticism/problems/diffi- culties/...; dealing with success is relatively easier. -- Cameron Laird http://starbase.neosoft.com/~claird/home.html claird(a)NeoSoft.com +1 281 996 8546 FAX

3 2

How to get the minor and major device numbers with os.stat ?
by Alain Tesio Aug. 24, 2003

Aug. 24, 2003

Hi, I can't manage to get the major or minor device numbers with os.stat : ~ $ll /dev/xda7 /dev/xda8 brw-rw---- 1 root disk 13, 7 Nov 30 2000 /dev/xda7 brw-rw---- 1 root disk 13, 8 Nov 30 2000 /dev/xda8 ~ $python Python 2.2.2 (#4, Oct 15 2002, 04:21:28) [GCC 2.95.4 20011002 (Debian prerelease)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import os >>> os.stat("/dev/xda7") (25008, 17383L, 5643L, 1, 0, 6, 0L, 1007270448, 975597764, 1007270448) >>> os.stat("/dev/xda8") (25008, 17384L, 5643L, 1, 0, 6, 0L, 1007270448, 975597764, 1007270448) >>> 17384 / 256 , 17384 % 256 (67, 232) I expected major*256+minor, I've tried a lot of combinations at random and couldn't manage to get 17383 from (13,7) Any idea ? Thanks Alain

4 5

Dr. Dobb's Python-URL! - weekly Python news and links (Sep 24)
by Dean Goodmanson June 26, 2003

June 26, 2003

QOTW: "When something "is *EVERYWHERE*", how can it be "clearly VISIBLE" at the same time?" - Alex Martelli http://mail.python.org/pipermail/python-list/2002-September/123526.html "... [A]necdotally speaking I find Python development goes faster more as a result of its very high readability than as a result of low loc/FP." Peter Hansen Threads Another good summary regarding a Python to C++ conversion http://mail.python.org/pipermail/python-list/2002-September/121194.html Insight into the Python shipped with Mac OS X 10.2 (Jaguar) http://mail.python.org/pipermail/python-list/2002-September/122912.html Rob Andrews requests ideas for Python advantages on Linux, with many resources in response http://groups.google.com/groups?selm=cBci9.43632%24U7.15670948%40twister.so… Where's shared memory functionality in the standard python distribution? http://mail.python.org/pipermail/python-list/2002-September/123431.html Classifying Python's typing evokes question and discussion of terms http://mail.python.org/pipermail/python-list/2002-September/123509.html Serial port programming tips, including: get a breakout box http://mail.python.org/pipermail/python-list/2002-September/123523.html Mathematical perspecives on Programming, ended in the reality of references http://mail.python.org/pipermail/python-list/2002-September/123526.html Getting started with Internationalization / il8n of a wxWindows app http://mail.python.org/pipermail/python-list/2002-September/123656.html Reviews and perspective on core programming language books http://mail.python.org/pipermail/python-list/2002-September/123676.html Is Python 2.2.1 compatible with Tcl/Tk 8.4? Yes, but you must recompile Python. http://mail.python.org/pipermail/python-list/2002-September/123770.html Discussion regarding Python as a compiled language http://mail.python.org/pipermail/python-list/2002-September/123776.html Mark Hammond details the steps for MS Outlook plug-in, finishing with the Python connection http://mail.python.org/pipermail/python-list/2002-September/124112.html Misc. New Python-XML column by Uche Ogbuji at xml.com. First article: http://www.xml.com/pub/a/2002/09/18/py.html O'Reilly offers Python Success Stories http://mail.python.org/pipermail/python-announce-list/2002-September/001694… Lightweight Languages Worshop 2002 (LL2) Saturday, November 9, 2002 - Cambridge, MA, USA http://ll2.ai.mit.edu/ 3-day Python training session with Mark Lutz in Colorado, on October 28-30 http://www.rmi.net/~lutz/oct02-longmont-class.html Brett Cannon's Python-dev summary for 2002-09-01 to 2002-09-15 http://mail.python.org/pipermail/python-announce-list/2002-September/001695… Call for Participation: UK Python Conference 2003, April 2-3 - Oxford. http://mail.python.org/pipermail/python-announce-list/2002-September/001692… Software eGenix.com's mx Python extension packages mxODBC 2.0.5 and BASE 2.0.4 versions released. http://www.egenix.com CilentForm HTML forms handler 0.0.2a alpha released http://mail.python.org/pipermail/python-announce-list/2002-September/001705… PyReverse 0.4 reverse code generator (plus) released including bug fixes, pyvcg support and improved documentation http://mail.python.org/pipermail/python-announce-list/2002-September/001702… RuneBlade 0.3.2 release includes updates for wxPython 2.3.3.1 and 2.3.2.1, aspect oriented support code, and optimizations and bug fixes http://mail.python.org/pipermail/python-announce-list/2002-September/001701… wxPython 2.3.3.1 released - Unicode and many other improvements for this wxWindows wrapper http://mail.python.org/pipermail/python-announce-list/2002-September/001700… Gordon McMillan releases version 5b4 of Installer http://mail.python.org/pipermail/python-announce-list/2002-September/001699… The bugfix-release, 0.5.1, of pyOpenSSL is out, and introduces basic PKCS12 support http://mail.python.org/pipermail/python-announce-list/2002-September/001693… Version 0.8.1 of the Python/XML distribution is now available, and should be considered a beta release http://mail.python.org/pipermail/python-announce-list/2002-September/001691… DocUtil's gets a DocFactory: a wxPython based "kind of integrated publishing environment for documentation" http://mail.python.org/pipermail/python-announce-list/2002-September/001690… pyblosxom is a weblogging tool written in Python and modelled after blosxom. http://mail.python.org/pipermail/python-announce-list/2002-September/001689… FontTools/TTX 2.0 beta 1, an Open Source Python library and toolkit to manipulate fonts. http://mail.python.org/pipermail/python-announce-list/2002-September/001688… ======================================================================== Everything 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 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 newly-revitalized newsgroup at least 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 summarizing action on the python-dev mailing list once every other week. http://starship.python.net/crew/mwh/summaries/ http://www.amk.ca/python/dev The Vaults of Parnassus ambitiously collect 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 Software Foundation has replaced the Python Consortium as an independent nexus of activity http://www.python.org/psf/ Cetus does much of the same http://www.cetus-links.org/oo_python.html Python FAQTS http://python.faqts.com/ 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 Links2Go is a new semi-automated link collection; it's impressive what AI can generate http://www.links2go.com/search?search=python Tenth International Python Conference http://www.python10.org 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. [http://www.egroups.com/list/python-url-leads/ is hibernating. Just e-mail us ideas directly.] 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.

4 5