🌐 Mailman 3 March 2010 - Python-list - python.org

Re: Adding to a module's __dict__?
by Roy Smith March 2, 2010

March 2, 2010

On Mar 2, 8:33 am, Steve Holden <st...(a)holdenweb.com> wrote: > And how important is it to make sure that whatever data your program > processes doesn't overwrite the actual variable names you want to use to > program the processing? Oh, I see what you're saying. You're thinking I was going to machine- process the C header file and pattern-match the #define statements? Actually, I was just hand-copying the values, and was looking for a way to reduce typing. But, I suppose if I were to machine-process the header files, that would be a concern. I suppose in that case I would make sure I only inserted variables which matched a particular pattern (ie, "[A-Z]+_[A- Z][A-Z0-9]+"). In fact, now that you got me thinking in that direction... Somewhat sadly, in my case, I can't even machine process the header file. I don't, strictly speaking, have a header file. What I have is a PDF which documents what's in the header file, and I'm manually re- typing the data out of that. Sigh.

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Re: freebsd and multiprocessing
by Tim Arnold March 2, 2010

March 2, 2010

On Mar 2, 11:52 am, Philip Semanchuk <phi...(a)semanchuk.com> wrote: > On Mar 2, 2010, at 11:31 AM, Tim Arnold wrote: > > > > > > > Hi, > > I'm intending to use multiprocessing on a freebsd machine (6.3 > > release, quad core, 8cpus, amd64). I see in the doc that on this > > platform I can't use synchronize: > > > ImportError: This platform lacks a functioning sem_open > > implementation, therefore, the required synchronization primitives > > needed will not function, see issue 3770. > > > As far as I can tell, I have no need to synchronize the processes--I > > have several processes run separately and I need to know when they're > > all finished; there's no communication between them and each owns its > > own log file for output. > > > Is anyone using multiprocessing on FreeBSD and run into any other > > gotchas? > > Hi Tim, > I don't use multiprocessing but I've written two low-level IPC > packages, one for SysV IPC and the other for POSIX IPC. > > I think that multiprocessing prefers POSIX IPC (which is where > sem_open() comes from). I don't know what it uses if that's not > available, but SysV IPC seems a likely alternative. I must emphasize, > however, that that's a guess on my part. > > FreeBSD didn't have POSIX IPC support until 7.0, and that was sort of > broken until 7.2. As it happens, I was testing my POSIX IPC code > against 7.2 last night and it works just fine. > > SysV IPC works under FreeBSD 6 (and perhaps earlier versions; 6 is the > oldest I've tested). ISTR that by default each message queue is > limited to 2048 bytes in total size. 'sysctl kern.ipc' can probably > tell you that and may even let you change it. Other than that I can't > think of any SysV limitations that might bite you. > > HTH > Philip Hi Philip, Thanks for that information. I wish I could upgrade the machine to 7.2! alas, out of my power. I get the following results from sysctl: % sysctl kern.ipc | grep msg kern.ipc.msgseg: 2048 kern.ipc.msgssz: 8 kern.ipc.msgtql: 40 kern.ipc.msgmnb: 2048 kern.ipc.msgmni: 40 kern.ipc.msgmax: 16384 I'll write some test programs using multiprocessing and see how they go before committing to rewrite my current code. I've also been looking at 'parallel python' although it may have the same issues. http://www.parallelpython.com/ thanks again, --Tim

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conditional import into global namespace
by mk March 2, 2010

March 2, 2010

Hello everyone, I have a class that is dependent on subprocess functionality. I would like to make it self-contained in the sense that it would import subprocess if it's not imported yet. What is the best way to proceed with this? I see a few possibilities: 1. do a class level import, like: class TimeSync(object): import subprocess 2. do an import in init, which is worse bc it's ran every time an instance is created: def __init__(self, shiftsec, ntpserver): import subprocess Both of those methods have disadvantage in this context, though: they create 'subprocess' namespace in a class or instance, respectively. Is there anyway to make it a global import? Regards, mk

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Re: Draft PEP on RSON configuration file format
by Steven D'Aprano March 2, 2010

March 2, 2010

On Sun, 28 Feb 2010 20:09:30 -0600, Patrick Maupin wrote: > All: > > Finding .ini configuration files too limiting, JSON and XML to hard to > manually edit, and YAML too complex to parse quickly, I have started > work on a new configuration file parser. > > I call the new format RSON (for "Readable Serial Object Notation"), and > it is designed to be a superset of JSON. Wait a minute... if JSON is too hard to edit, and RSON is a *superset* of JSON, that means by definition every JSON file is also a valid RSON file. Since JSON is too hard to manually edit, so is RSON. > I would love for it to be considered valuable enough to be a part of the > standard library, Come back when you actually have MANY users other than yourself using this is real-world projects. Until then, it is too early to even consider adding it the std library. Python comes with batteries included, but not experimental batteries that aren't even built yet, let alone proven that they work. -- Steven

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Re: Docstrings considered too complicated
by Andreas Waldenburger March 2, 2010

March 2, 2010

On Mon, 01 Mar 2010 18:42:17 +0100 Jean-Michel Pichavant <jeanmichel(a)sequans.com> wrote: > Andreas Waldenburger wrote: > [snip] > > Back in the software world: Those guys write code that works. It > > does what it's supposed to do. Why should we care where they put > > their comments? > > > > > If you've bought the code and want to maintain it, you'd better make > sure it's possible. > Fair enough, but we don't want to maintain it. > By the way, the ISO 9001 standard ask for your out sourced processing > to be compliant with your QA objectives, so if you care about your > code, then you should care for the code you buy. > We did not buy code. If it were written in C or such, we would never get to see it. It's not our concern. /W -- INVALID? DE!

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Call Signtool using python
by enda man March 2, 2010

March 2, 2010

Hi, I want to call the Windows signtool to sign a binary from a python script. Here is my script: // os.chdir('./Install/activex/cab') subprocess.call(["signtool", "sign", "/v", "/f", "webph.pfx", "/t", "http://timestamp.verisign.com/scripts/timstamp.dll", "WebPh.exe" ]) // But I am getting this error: //// SignTool Error: The specified PFX password is not correct. Number of files successfully Signed: 0 Number of warnings: 0 Number of errors: 1 Finished building plugin installer scons: done building targets. //// This python script is called as part of a scons build, which is also python code. Anyone seen this before or can pass on any ideas. Tks, EM

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Re: Call Signtool using python
by enda man March 2, 2010

March 2, 2010

On Mar 2, 2:46 pm, "Matt Mitchell" <mmitch...(a)transparent.com> wrote: > I think you need to use the /p switch to pass signtool.exe a password > when using the /f switch. > Check outhttp://msdn.microsoft.com/en-us/library/8s9b9yaz%28VS.80%29.aspxfor > more info. > > ----------------------------------- > The information contained in this electronic message and any attached document(s) is intended only for the personal and confidential use of the designated recipients named above. This message may be confidential. If the reader of this message is not the intended recipient, you are hereby notified that you have received this document in error, and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify sender immediately by telephone (603) 262-6300 or by electronic mail immediately. Thank you. > > -----Original Message----- > From: python-list-bounces+mmitchell=transparent....(a)python.org > > [mailto:python-list-bounces+mmitchell=transparent....@python.org] On > Behalf Of enda man > Sent: Tuesday, March 02, 2010 6:34 AM > To: python-l...(a)python.org > Subject: Call Signtool using python > > Hi, > > I want to call the Windows signtool to sign a binary from a python > script. > > Here is my script: > // > os.chdir('./Install/activex/cab') > subprocess.call(["signtool", "sign", "/v", "/f", "webph.pfx", "/t", > "http://timestamp.verisign.com/scripts/timstamp.dll", "WebPh.exe" ]) > // > > But I am getting this error: > //// > SignTool Error: The specified PFX password is not correct. > > Number of files successfully Signed: 0 > Number of warnings: 0 > Number of errors: 1 > Finished building plugin installer > scons: done building targets. > //// > > This python script is called as part of a scons build, which is also > python code. > > Anyone seen this before or can pass on any ideas. > Tks, > EM > > --http://mail.python.org/mailman/listinfo/python-list > > The same command works when run from the command line but when I run it from python using subprocess.call(...) it fails as described in my first post. I do not need to use the /p switch as the password is embedded in the pfx file. That is why I think it is something I am or am not doing in python. EM

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freebsd and multiprocessing
by Tim Arnold March 2, 2010

March 2, 2010

Hi, I'm intending to use multiprocessing on a freebsd machine (6.3 release, quad core, 8cpus, amd64). I see in the doc that on this platform I can't use synchronize: ImportError: This platform lacks a functioning sem_open implementation, therefore, the required synchronization primitives needed will not function, see issue 3770. As far as I can tell, I have no need to synchronize the processes--I have several processes run separately and I need to know when they're all finished; there's no communication between them and each owns its own log file for output. Is anyone using multiprocessing on FreeBSD and run into any other gotchas? thanks, --Tim Arnold

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Re: Is this secure?
by aahz＠pythoncraft.com March 2, 2010

March 2, 2010

In article <mailman.247.1267115557.4577.python-list(a)python.org>, Robert Kern <robert.kern(a)gmail.com> wrote: > >If you are storing the password instead of making your user remember >it, most platforms have some kind of keychain secure password >storage. I recommend reading up on the APIs available on your targeted >platforms. Are you sure? I haven't done a lot of research, but my impression was that Windows didn't have anything built in. -- Aahz (aahz(a)pythoncraft.com) <*> http://www.pythoncraft.com/ "Many customs in this life persist because they ease friction and promote productivity as a result of universal agreement, and whether they are precisely the optimal choices is much less important." --Henry Spencer

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Re: taking python enterprise level?...
by aahz＠pythoncraft.com March 2, 2010

March 2, 2010

In article <mailman.99.1267513003.23598.python-list(a)python.org>, D'Arcy J.M. Cain <darcy(a)druid.net> wrote: > >Put as much memory as you can afford/fit into your database server. >It's the cheapest performance boost you can get. If you have a serious >application put at least 4GB into your dedicated database server. >Swapping is your enemy. Also, put your log/journal files on a different spindle from the database files. That makes a *huge* difference. -- Aahz (aahz(a)pythoncraft.com) <*> http://www.pythoncraft.com/ "Many customs in this life persist because they ease friction and promote productivity as a result of universal agreement, and whether they are precisely the optimal choices is much less important." --Henry Spencer

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