Mailman 3 June 2003 - Python-Dev

No Net at home
by Brett C. 29 Jun '03

29 Jun '03

Ah, the joys of a local Net outage. No Net at home basically means I am cut off from the rest of the world. Comcast gave me the usual "24 to 72 hours" for when it will be over. Regardless, I don't know when I will get to check mail again, so consider me out of commission for now. The next Summary will be ready to be fact checked when I get Net back. -Brett

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Re: Activating `-i' from inside a script?
by Skip Montanaro 29 Jun '03

29 Jun '03

On c.l.py someone asked about forcing a tailend interactive shell from within the program. Try Melhase proposed: import os if __name__ == '__main__': discrepancy = True if discrepancy: os.environ['PYTHONINSPECT'] = "why yes, i'd like that" but observed that it doesn't work because the environment variable is only checked at program start. This change to Modules/main.c makes the above work: % cvs diff main.c Index: main.c =================================================================== RCS file: /cvsroot/python/python/dist/src/Modules/main.c,v retrieving revision 1.77 diff -c -r1.77 main.c *** main.c 30 Mar 2003 17:09:58 -0000 1.77 --- main.c 27 Jun 2003 11:50:42 -0000 *************** *** 418,423 **** --- 418,428 ---- filename != NULL, &cf) != 0; } + /* also check at the end in case the program set PYTHONINSPECT */ + if (!saw_inspect_flag && + (p = Py_GETENV("PYTHONINSPECT")) && *p != '\0') + inspect = 1; + if (inspect && stdin_is_interactive && (filename != NULL || command != NULL)) /* XXX */ I can't see that it would affect the functioning of any programs other than those which set PYTHONINSPECT now. (But why would they do that and what's the likelihood such programs exist?) Any chance this could be squeezed in? It seems rather elegant: try: something which fails except: os.environ["PYTHONINSPECT"] = 1 raise (I know we're at beta1, and the programmer could re-run with -i. But still...) Skip

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Python 2.3b2 branch tag created
by Barry Warsaw 29 Jun '03

29 Jun '03

I've just tagged and branched Python 2.3b2, so the trunk is now open for checkins again. Of course the r23b2-branch is closed so we can spin the release. -Barry

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Weekly Python Bug/Patch Summary
by Skip Montanaro 29 Jun '03

29 Jun '03

Bug/Patch Summary ----------------- 359 open / 3765 total bugs (no change) 162 open / 2241 total patches (no change) New Bugs -------- inspect.getmembers broken (?) (2003-06-23) http://python.org/sf/759525 asyncore.py and "handle_error" (2003-06-25) http://python.org/sf/760475 Tutorial: executable scripts on Windows (2003-06-25) http://python.org/sf/760657 tkMessageBox.askyesnocancel missing (2003-06-26) http://python.org/sf/761144 Failure in comparing unicode string (2003-06-26) http://python.org/sf/761267 HTMLParser chokes on my.yahoo.com output (2003-06-26) http://python.org/sf/761452 readline()/readlines() (2003-06-27) http://python.org/sf/761787 popen2.Popen3 and popen2.Popen4 leaks filedescriptors (2003-06-27) http://python.org/sf/761888 PackMan needs to be able to install outside site-packages (2003-06-27) http://python.org/sf/762147 bug in signal.signal -- raises SystemError (2003-06-27) http://python.org/sf/762198 Python segfaults when sys.stdout is changed in getattr (2003-06-28) http://python.org/sf/762455 problem building c extension with minGW on Windows (2003-06-29) http://python.org/sf/762614 New Patches ----------- extending readline functionality (2003-01-27) http://python.org/sf/675551 curses has_key emulation fix (2003-06-23) http://python.org/sf/759208 add time elapsed to gc debug output (2003-06-25) http://python.org/sf/760990 adding BaseSet.filter and Set.filter_update (2003-06-26) http://python.org/sf/761104 DISTUTILS_DEBUG undocumented (2003-06-26) http://python.org/sf/761401 readline module that checks signals (2003-06-27) http://python.org/sf/761863 patch against readline module to handle signals (2003-06-27) http://python.org/sf/761865 -DPIC should be added for the -fPIC case (2003-06-27) http://python.org/sf/761969 pep-283 outdated (2003-06-28) http://python.org/sf/762502 Closed Bugs ----------- 'testlist" undefined in grammar (2002-05-04) http://python.org/sf/552262 inspect and object instances (2002-10-08) http://python.org/sf/620190 Tutorial: info on Source Code Encoding is missing (2003-02-09) http://python.org/sf/683486 How to make a class iterable using a member generator. (2003-03-03) http://python.org/sf/696777 os.utime can fail with TypeError (2003-03-13) http://python.org/sf/703066 Broken links for grammar in docs (2003-04-23) http://python.org/sf/726150 What's new in Python2.3b1 HTML generation. (2003-04-28) http://python.org/sf/729297 Python-Profiler bug: Bad call (2003-05-28) http://python.org/sf/744841 threads broke on FreeBSD current (2003-05-28) http://python.org/sf/745320 make test errors Tru64 UNIX V5.1A (2003-06-02) http://python.org/sf/747460 Need to register PythonLauncher as handler for .py (2003-06-19) http://python.org/sf/757542 logging module docs (2003-06-20) http://python.org/sf/757821 Additional index items, other minor details (2003-06-20) http://python.org/sf/757822 socket timeout exception unhelpful (2003-06-20) http://python.org/sf/758239 Closed Patches -------------- improve pydoc handling of extension types (2003-01-22) http://python.org/sf/672855 Several objects don't decref tmp on failure in subtype_new (2003-03-14) http://python.org/sf/703666 Patch to make shlex accept escaped quotes in strings. (2003-04-12) http://python.org/sf/720329 Trivial improvement to NameError message (2003-05-12) http://python.org/sf/736730 Port tests to unittest (Part 2) (2003-05-13) http://python.org/sf/736962 'compiler' module bug with 'import foo.bar as baz' (2003-06-06) http://python.org/sf/750008 Handle keyboard interrupts in SSL module (2003-06-10) http://python.org/sf/751916 Enhance xrange description by mentioning itertools.repeat (2003-06-14) http://python.org/sf/754632 re reads an uninitialized memory (2003-06-17) http://python.org/sf/756032 test_itertools for roundrobin() and window() (2003-06-17) http://python.org/sf/756255 Bare except in ZipFile.testzip() (2003-06-18) http://python.org/sf/756996

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Re: SF CVS hosed?
by Anthony Baxter 29 Jun '03

29 Jun '03

>>> Anthony Baxter wrote > > Attempting a cvs up at the moment is failing with: > > cvs server: failed to create lock directory for `/cvsroot/python/python/dist/ src' (/cvsroot/python/python/dist/src/#cvs.lock): Permission denied > cvs server: failed to obtain dir lock in repository `/cvsroot/python/python/d ist/src' > cvs [server aborted]: read lock failed - giving up After quite some time of not working, it of course started working 2 minutes after I sent this email. *sigh* cvs: less bad than the alternatives... Anthony

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Proposed DNS query library
by John D. 29 Jun '03

29 Jun '03

Python has everything else, but it doesn't have a nameserver lookup class. I propose creating a library which will perform the equivalent of the "dig" or "nslookup" commands. My own application is using it to query a DNS for mx records as a preface to using smtplib. (Perhaps this should be added to smtplib?) dnslib? diglib? domainlib? nslookuplib? Possibly: servers=dnsquery([nameserver],[name],[type],[class]) i.e. >>>from dnslib import dnsquery >>>d=dnsquery(,"google.com","mx") >>>print d ['10 smtp1.google.com','20 smtp2.google.com'] It would have the usual options, etc. Is this a good idea or do I need to spend more time in the oven? (or worse, it already exists and I overlooked it?)

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Re: [Python-Dev] Py2.3 Todo List
by Guido van Rossum 28 Jun '03

28 Jun '03

[Kevin Jacobs, privately] > I'll vote for applying patch #751916, which fixes some memory leaks in the > timeout code, and allows the SSL code to recover from keyboard interrupts. > I have several applications that work with 2.2.x that do not currently with > the 2.3 CVS due to this issue. Can someone review this and apply if it's okay? From this description I'd be okay with including it, but I have no time to review. --Guido van Rossum (home page: http://www.python.org/~guido/)

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socket timeouts and httplib
by Jeremy Hylton 28 Jun '03

28 Jun '03

There's a long standing, hard to reproduce bug report about httplib -- 666219 -- that got me looking at the socket timeout code today. The most basic question I have is: Do we expect the timeout code to work with the httplib module? The original timeoutsocket module uses httplib as an example of its use. I ask because some simple httplib tests aren't working as expected with timeouts turned on. I'm also curious because the socket documentation says you shouldn't mix timeouts and makefile(), and httplib uses makefile(). When I do have a small timeout and a slow server, I sometimes see an error like this: Traceback (most recent call last): File "/tmp/foo.py", line 14, in ? f = urllib.urlopen(url) File "/home/jeremy/src/python/dist/src/Lib/urllib.py", line 76, in urlopen return opener.open(url) File "/home/jeremy/src/python/dist/src/Lib/urllib.py", line 181, in open return getattr(self, name)(url) File "/home/jeremy/src/python/dist/src/Lib/urllib.py", line 297, in open_http h.endheaders() File "/home/jeremy/src/python/dist/src/Lib/httplib.py", line 710, in endheaders self._send_output() File "/home/jeremy/src/python/dist/src/Lib/httplib.py", line 595, in _send_output self.send(msg) File "/home/jeremy/src/python/dist/src/Lib/httplib.py", line 562, in send self.connect() File "/home/jeremy/src/python/dist/src/Lib/httplib.py", line 546, in connect raise socket.error, msg IOError: [Errno socket error] (114, 'Operation already in progress') The socketmodule code is specifically looking for an EINPROGRESS return from connect(), but I'm getting an EALREADY. These are related but distinct errors on Linux. I'm not sure if I should file a bug report for code or documentation or if it should somehow be obvious that I'm doing something wrong. Jeremy

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Yet more SRE
by Gustavo Niemeyer 28 Jun '03

28 Jun '03

I've just submitted to SF #757624 the third implementation of the SRE changes. Unlike the other implementations, this one doesn't recurse at all, and doesn't change the meaning of the opcodes in the engine. Indeed, the original logic is mostly unchanged, and the recursion has been removed by a code reorganization. Most of the magic is done using "jumps", and "context saving" inside SRE_MATCH. It's even possible to reenable the recursive scheme by enabling the USE_RECURSION macro. Besides the regression tests, I have tested this using Fredrik's suggestion, with a 4MB XML file and xmllib/tokenize modules. There was a very small slow down (i.e. about 37.4s in old implementation vs. 38.0s in new implementation). Bugs previously mentioned are also fixed in this implementation. This implementation also includes the protection against zero-width match in greedy expressions ("(?=a)*", "a"). Even if this implementation doesn't get into 2.3, I was thinking about backporting this specific fix to 2.3. Unfortunately, this would need an additional local variable in SRE_MATCH of the current implementation, and I'm afraid to reduce the recursion limit even more by introducing it. Additionally, after a quick look over perl's regex engine, I also have some ideas for matching optimization in SRE, but I'll wait a little bit before fiddling with it. -- Gustavo Niemeyer http://niemeyer.net

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proposed Tkinter change; any likelihood of acceptance?
by Russell E. Owen 28 Jun '03

28 Jun '03

I'd like to introduce a small enhancement to Tkinter, but would like some idea of whether it has a chance of acceptance before proceeding too far (e.g. before checking in a patch). The primary change is to add a "name" argument to the Variable.__init__, bringing it in line with other Tkinter classes. The justification is to allow users to create new Tkinter variables that point to existing tcl variables (e.g. somewhat similar to nametowidget). In some cases this may be more convenient than using setvar and getvar. Subtlety: - A new __eq__ method makes two Tkinter variables compare as equal if they are of the same type and have the same tcl name. If it is not overreaching, I'd like to introduce a few related changes at the same time. 1) add a "value" argument to Variable.__init__. This would set the initial value of the new variable -- a feature I've long wanted. Subtlety: - If "name" is specified and the variable already exists, then "value" is ignored (so the existing value is preserved). One could always ignore "value" if the variable exists, but I suspect users would prefer to assume that newly created auto-named variables will be properly initialized to some default value. 2) add a new function "nametovariable" which returns a Tkinter variable given the name of a tcl variable. Subtleties: - To return a Tkinter variable of the correct class, this requires changing the auto naming scheme for Tkinter variables. I propose PY_class_num where class is the appropriate subclass of Variable. This is the only change that has any danger of affecting existing code. - If the name does not meet the criteria, a StringVar is returned - If the tcl variable does not exist, an exception is raised. This is not necesarry, but prevents accidentaly creating a new variable when one was trying to point to an existing one. If this is too much of a change for 2.3b1 but might be considered for later releases, I'd like some idea if I should submit any of it now or wait or what. -- Russell

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