🌐 Mailman 3 September 2006 - Python-list - python.org

Pmw installation problem
by vedran_dekovic＠yahoo.com Sept. 3, 2006

Sept. 3, 2006

Hi, When I download Pmw,and .py files copy to lib,then in python shell I write: >>>import Pmw Traceback (most recent call last): File "<pyshell#44>", line 1, in -toplevel- import Pmw ImportError: No module named Pmw Regards, Vedran,Croatia

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Re: Client-side TCP socket receiving "Address already in use" upon connect
by Tor Erik Sept. 3, 2006

Sept. 3, 2006

Fredrik Lundh wrote: > Tor Erik wrote: > >> The reason is that my application does about 16 connects and data >> transfers per second, to the same 16 remote hosts. After approx 200 >> secs there are 4000 sockets waiting to be garbage collected by the OS. > > what does "netstat" say about these sockets ? > > </F> > They are in the TIME_WAIT state... The msn library has an article on how to solve this: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/BTS06CoreD… Summing up one could either: 1. Increase the upper range of ephemeral ports that are dynamically allocated to client TCP/IP socket connections: set registry key: KEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\MaxUserPort to a new DWORD value... (5000 - 65534) The default in XP is 3976 -> http://support.microsoft.com/kb/Q149532 or 2. Reduce the client TCP/IP socket connection timeout value from the default value of 240 seconds set registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\TcpTimedWaitDelay to a new DWORD value (30 - 300) The TCP RFC (RFC 793) recommends a value of 2*msl(Maximum Segment Lifetime). The general consensus about the value of msn seems to be 1-2 minutes, depending on the underlying network... (2*2 min = 2*120 sec = 240 sec) I do not want to alter my registry, so I'm currently testing an idea where I let the client connect and send its content, appended with my own "magic" EOF byte-sequence. When the server receives this EOF, it takes care to close the connection. This should eliminate the problem as it is the peer closing the connection that enters the TIME_WAIT state... I will report my experiences...

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OO on python real life tutorial?
by filippo Sept. 3, 2006

Sept. 3, 2006

Hello, I coded my +10k lines app using Perl/Tk. It is something like a hotel software manager, it has a bunch of windows to manage the arrivals, bills etc etc. I want to port this on Python/WxPython but I'd like to get benefit of python, not just doing a row by row raw porting. My problem is that I cannot figure out how OO could be useful in my case. Is there a OO tutorial out there to help me? Thanks, Filippo

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How to run Python file?
by mistral Sept. 3, 2006

Sept. 3, 2006

I have installed ActivePython http://www.activestate.com/Products/ActivePython/ How I can run Python file, test.py?

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Re: How to run Python file?
by mistral Sept. 3, 2006

Sept. 3, 2006

Steve Holden писал(а): > mistral wrote: > > I have installed ActivePython > > http://www.activestate.com/Products/ActivePython/ > > How I can run Python file, test.py? > Sheesh, you must have had ten replies and nobody bothered to point you > to the frequently-asked questions ... kids today! > http://www.python.org/doc/faq/windows.html > regards > Steve > -- > Steve Holden +44 150 684 7255 +1 800 494 3119 > Holden Web LLC/Ltd http://www.holdenweb.com > Skype: holdenweb http://holdenweb.blogspot.com > Recent Ramblings http://del.icio.us/steve.holden ----------- Really, looks its clear and straightforward Python FAQ. thanks.

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Re: python loops
by Nicko Sept. 3, 2006

Sept. 3, 2006

Fredrik Lundh wrote: > Nicko wrote: > > > ... In the case of the idiom "for i in > > range(x):..." there absolutely no utility whatsoever in creating and > > recording the list of objects. > > for short lists, both objects create the *same* number of objects. This is true for long lists too, if you iterate over the full range, but what I wrote was "creating and recording". The range() function generates a variable-sized, potentially large object and retains all of the items in the range while xrange() generates a fairly small, fixed sized object and only hangs on to one item at a time. Furthermore, it's not at all uncommon for loops to be terminated early. With range() you incur the cost of creating all the objects, and a list large enough to hold them, irrespective of if you are going to use them. > if you cannot refrain from pulling arguments out of your ass, you not > really the right person to talk about hygiene. I'm impressed but your mature argument. Clearly, in the face of such compelling reasoning, I shall have to concede that we should all generate our range lists up front. Nicko

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Re: Client-side TCP socket receiving "Address already in use" upon connect
by Tor Erik Sept. 3, 2006

Sept. 3, 2006

Sybren Stuvel wrote: > Tor Erik enlightened us with: >> The reason is that my application does about 16 connects and data >> transfers per second, to the same 16 remote hosts. After approx 200 >> secs there are 4000 sockets waiting to be garbage collected by the >> OS. > > Which OS are we talking about? Windows XP > >> At this point is seems that connect loops and starts using the same >> local addresses it used 4000 connections ago, resulting in an >> "Address already in use" exception. > > After how many seconds does this happen? 200 seconds approx > >> My question is if there are any other methods of solving this? Maybe >> a socket option of some sort... > > If I'm correct (please correct me if I'm not), on Linux you can use > 'sysctl -w net.ipv4.tcp_fin_timeout=X' to set the time between closing > the socket and releasing it to be reused. You can also check the > SO_REUSEADDR argument to the setsockopt function. Read 'man 7 socket' > for more info. I've read about SO_REUSEADDR. As far as I understand, this is what SO_REUSEADDR is for: 1. Allow a listening socket to bind itself to its well-known port even if previously established connections use it as their local port. Setting this option should be done between calls to socket and bind, and hence is only usable for listening sockets, not client sockets like mine. 2. Allow multiple servers on the same host with different ip-adresses to listen to the same port. I've tried setting this option, but could not see any notable changes... > > Sybren

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Building Python with non-traditional paths
by djbclark＠gmail.com Sept. 3, 2006

Sept. 3, 2006

Is there a clean way to build Python under a non-traditional path, linking with other software that is under non-traditional paths, on unix? I maintain a build of Python [1] that is part of a self-contained bundle of software [2] to run bcfg2 [3]. The major problem I am having is getting the build to link to the openssl libraries, which are installed under /usr/local/lib/bcfg2/lib; I tried (on GNU/Linux): LDFLAGS="-L/usr/local/lib/bcfg2/lib -Wl,-rpath,/usr/local/lib/bcfg2/lib" CPPFLAGS="-I/usr/local/lib/bcfg2/include" but that didn't work. The only thing I could do to get it to work (sometimes) was to edit the setup.py file directly before the ./configure; make; make install like this: cat setup.py \ | sed s:\/usr\/local\/:\/usr\/local\/lib\/bcfg2\/:g \ | sed s:\/usr\/local\/lib\/bcfg2\/ssl\/include:\/usr\/local\/lib\/bcfg2\/include:g \ | sed s:\/usr\/contrib\/ssl\/include\/:\/usr\/local\/lib\/bcfg2\/include\/openssl\/:g \ | sed s:\/usr\/local\/lib\/bcfg2\/ssl\/lib:\/usr\/local\/lib\/bcfg2\/lib:g \ > setup.py.bcfg2 mv setup.py.bcfg2 setup.py However that is rather ugly, and modifies the source which I'd rather not do. Is there a better/cleaner way? [1] Complete build spec for Python for Bcfg2 http://www.bcfg2.org/browser/trunk/bcfg2/encap/src/encap-profiles/bcfg2-pyt… [2] Bcfg2 Encap Packages - Overview http://www.bcfg2.org/wiki/EncapPackages [3] Bcfg2 - Provides a declarative interface to system configuration http://www.bcfg2.org

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Re: Problem loading true-type font with PIL - "solved"
by Christian Stapfer Sept. 3, 2006

Sept. 3, 2006

Robert Kern wrote: > Fredrik Lundh wrote: >> Christian Stapfer wrote: >> >>> Problem "solved" by rudely installing PIL 1.1.5 for Windows and >>> Python 2.4 from http://www.pythonware.com/products/pil/ >>> right on top of my existing "Python Enthought Edition--Python >>> 2.4.3 for Windows". This might have destroyed the consistency >>> of the overall installation, of course. I'm well punished >>> for installing Enthought Python 2.4.3: Next time I will again >>> install all packages that I need myself, as I did for Python >>> 2.3, instead of using a prepackaged distribution like Enthought >>> Python. >> >> Since the truetype extension is quite popular, and from what I'm told >> worked just fine in earlier Enthought releases, this is probably just an >> accidental omission. I'm sure the Enthought people will fix this if you >> report it to them. > > https://svn.enthought.com/enthought/ticket/864 > > The person who builds the Enthought Edition releases is out on vacation > this week, so a new release will probably wait until he comes back. In the > meantime, installing Fredrik's binaries on top of ours should work just > fine. Great! - if it does. (Your words in God's ear...) Sorry about leaving out some details about the release I installed. Maybe the following helps? C:\Python24\Enthought\Doc>python Python 2.4.3 - Enthought Edition 1.0.0 (#69, Aug 2 2006, 12:09:59) [MSC v.1310 32 bit (Intel)] on win32 Perhaps not. Since I have already deleted the Windows installer, and do not know of any other way to get Enthought-specific version info, this is all I can offer at the moment... (I had downloaded the installer from http://code.enthought.com/enthon/ on August 31, around 06:00 GMT. I suppose this means that it was enthon-python2.4-1.0.0.exe, but cannot verify anymore whether it was this specific installer that I used - or not.) Best regards and thanks for your reply, Christian Stapfer

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Client-side TCP socket receiving "Address already in use" upon connect
by Tor Erik Sept. 3, 2006

Sept. 3, 2006

Hi, The reason is that my application does about 16 connects and data transfers per second, to the same 16 remote hosts. After approx 200 secs there are 4000 sockets waiting to be garbage collected by the OS. At this point is seems that connect loops and starts using the same local addresses it used 4000 connections ago, resulting in an "Address already in use" exception. A possible solution to this would be to keep the connection to each remote host open, but that would require parsing of the received data into the data items (which are files by the way) sent by the application. My question is if there are any other methods of solving this? Maybe a socket option of some sort... regards

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