Linuxers December 2006

linuxers@mm.ilug-bom.org.in

93 participants
146 discussions

Re: [ILUG-BOM] problem with pyQt
by Chirag Wazir 18 Dec '06

18 Dec '06

Pradnyesh Sawant wrote: > why would one not use an IDE (especially one where one can drag-drop > widgets onto a form) to create a gui? is it not more intuitive? > is code generation not less cumbersome this way? especially > with layouts; coz i just saw that qt4-designer does a very good job > of laying out stuff, and that manually it would be very hard to place > stuff at proper positions, and then configuring each petty detail of > each widget Actually it's just my personal preference. There's no harm in using the designer, but some advantages of manual coding are - (a) You have absolute control over code, (b) Well written code is self documenting, so you have a list of exactly what changes you have made to default properties of each widget and (c) This may not be important in many situations, but your own code tends to be smaller and neater than the generated code. I sometimes use the designer to do an initial layout and then copy and paste modified bits into my final code. This is especially helpful when you're still learning the relevant calls for various properties of widgets. Of course, doing it manually negates the advantage of having a separate and easily modifiable file for the GUI components, but I personally find the advantages outweigh the disadvantages. BTW, there isn't a problem with "manually it would be very hard to place stuff at proper positions" because Qt uses layouts like Java unlike say Visual Basic. So usually one doesn't position things using coordinates, just specifies the hierarchy. For example you're telling it that there is a dialog containing a frame containing a horizontal layout containing 3 buttons and an image. Actually compared to drawing out a dialog box in VB, using the Qt designer is a little more complicated because of this. But the initial complexity pays some nice dividends for both the end-user and the programmer: automatic widget positioning and layout allows easy resolution-independence, simple resizable windows and ultimately convenient portability. P.S. I'm wondering if this thread isn't getting a bit too far off topic for the list. BTW, comp.lang.python is a very useful resource for this sort of stuff. If you're not a regular usenet user try: http://groups.google.com/group/comp.lang.python?hl=en Chirag Wazir http://chirag.freeshell.org

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Saving multiple values returned by cut command into different variables
by Pascal Nunes 17 Dec '06

17 Dec '06

hi, I am writing a shell script where I retrive values from a text file using cut. I want to save these into variables. The script is something like this... grep searchtext file | cut -f 1,3,7,8 I want to save the values returned by cut into 4 different variables. Can anyone suggest a method to save these values into multiple variables? Is there any better method to do this? - pascal. -- Any tool is only as good as it is used. .:[ http://pascal_nunes.blogspot.com ]:.

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[Commercial] Linux openings at Delhi
by Openlx Linux 17 Dec '06

17 Dec '06

Hello List, We have a requirement for 1. Four Linux Administrators with a good background in monitoring. Basic requirements being decent communication, excellent attitude and ability to work as a team. The technical requirements are: MUST Protocols: SNMP, SMTP, POP3, IMAP, HTTP, LDAP, DNS Monitoring: SNMP, Nagios, WMI, Other Skills: Shell (bash) scripting GOOD to have Database: MySQL, PgSQL Web Servers: Apache Packaging: RPM, Anaconda Applications: openLDAP Awareness of ITIL / FCAPS Iptables, selinux, opennms MTA: qmail, postfix 2. Three programmers with excellent knowledge of C, C++, SQL (preferably PostgreSQL) on Linux. Additionally capabilities in GTK-Glade will be of use. 3. One DBA with excellent skills in PostgreSQL and MySQL. 4. Two programmers with excellent knowledge (preferably experienced) of PHP, PostgreSQL, MySQL. Desirable knowledge of Perl. 5. Marketing personnel ( 10 ) for marketing Linux products and services. Those interested in long-term working relationships, fitting the requirements and are interested, please send me (offline only) your detailed profile. Ashok. -- Linux - Transforming Lives !

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Re: [ILUG-BOM] problem with pyQt
by Chirag Wazir 17 Dec '06

17 Dec '06

Pradnyesh Sawant wrote: > 1. i have some d'loaded python scripts (eg: memaid-pyqt), which use > "import qt". what'll happen to those scripts? how much rework (if any) > is necessary to get them into working condition again? In my experience it requires quite a bit of work - I found it easier to rewrite one of my own programs from scratch rather than modify it (the logic could be copy/pasted, but the GUI I rewrote). The changes are definitely for the better, but if you're not the original author of the code you can expect it to be quite painful to modify it to use the new version. Some of it is fairly mechanical - searching for the new location of various functions and changing calls from QPushButton() to QtGui.QPushButton() etc. Other changes are more subtle, like changes in behaviour and deprecation of some widgets. > 2. can you kindly provide me with some good pyqt (using qt4 designer) > tutorials? the net provides qt4 tuts but not with designer :( I don't really use the designer myself so I haven't looked, I find it is easier to maintain code I write from scratch rather than worrying about exactly how the designer & pyuic decide to do things. As Pradeepto Bhattacharya pointed out, the Qt4 documentation and examples are helpful - assuming you're conversant with C++. There are also some useful examples of PyQt4 code at: http://indico.cern.ch/contributionDisplay.py?contribId=33&confId=44 You might also look at: http://en.wikibooks.org/wiki/PyQt4 Chirag Wazir http://chirag.freeshell.org

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Re: [ILUG-BOM] problem with pyQt
by Chirag Wazir 17 Dec '06

17 Dec '06

Hi Pradnyesh, Pradnyesh Sawant wrote: > i'm new to pyQt and am having trouble getting it to work. i have > python2.4, qt4 and sip4 installed .... > i get the following error:- >>>> import qt > Traceback (most recent call last): > File "", line 1, in ? > ImportError: No module named qt PyQt 4 has a different module organization compared to previous versions. You no longer use "import qt" The library has been split functionally and you typically use something like "from PyQt4 import QtCore, QtGui" There are many other differences from previous versions and when I switched directly from 2.13 to 4.0 I got quite a shock - all older programs need significant work to be fixed. Since you're starting from scratch, make sure that you use documentation or books that are up-to-date and refer to Qt 4.x, otherwise you're going to get very confused. Chirag Wazir http://chirag.freeshell.org

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problem with pyQt
by Pradnyesh Sawant 16 Dec '06

16 Dec '06

Hello all, i'm new to pyQt and am having trouble getting it to work. i have python2.4, qt4 and sip4 installed on my system (debian etch; upgraded from sarge to etch in the hope that this problem will go away, but it didn't), but i get the following error:- >>> import qt Traceback (most recent call last): File "<stdin>", line 1, in ? ImportError: No module named qt googling around for 2 days, gave me one useful link:- http://mats.gmd.de/pipermail/pykde/2004-July/008172.html so i removed all traces of python2.3 (see point 2 in above link), and finally am left with following packages:- pyqt:- pyqt-tools, pyqt4-dev-tools, python-qt-dev, python-qt4, python-qt4-dev, python2.3-qt4 (virtual, dunno why this is still there, can't remove it though), python2.4-qt4 (virtual, dunno why this is still there) qt:- qt4-dev-tools, qt4-designer, libqt4-dev, libqt4-core, libqt4-gui, libqt4-qt3support, libqt4-sql, qt4-qtconfig, sip4:- sip4, python-sip4, python-sip4-dev, python2.3-sip4 (virtual, dunno why this is still there, can't remove it though), python2.4-sip4 (virtual) then i searched for site-packages:- $ locate site-pack | grep pyqt /usr/lib/python2.3/site-packages/PyQt4/pyqtconfig.py /usr/lib/python2.4/site-packages/PyQt4/pyqtconfig.py /usr/lib/python2.4/site-packages/PyQt4/pyqtconfig.pyc checked the sys.path variable in python >>> import sys >>> print sys.path ['', '/usr/lib/python24.zip', '/usr/lib/python2.4', '/usr/lib/python2.4/plat-linux2', '/usr/lib/python2.4/lib-tk', '/usr/lib/python2.4/lib-dynload', '/usr/local/lib/python2.4/site-packages', '/usr/lib/python2.4/site-packages', '/var/lib/python-support/python2.4'] appended path obtained in locate (above) to sys.path >>> sys.path.append('/usr/lib/python2.4/site-packages/PyQt4') >>> print sys.path ['', '/usr/lib/python24.zip', '/usr/lib/python2.4', '/usr/lib/python2.4/plat-linux2', '/usr/lib/python2.4/lib-tk', '/usr/lib/python2.4/lib-dynload', '/usr/local/lib/python2.4/site-packages', '/usr/lib/python2.4/site-packages', '/var/lib/python-support/python2.4', '/usr/lib/python2.4/site-packages/PyQt4'] but still i have the same problem >>> import qt Traceback (most recent call last): File "<stdin>", line 1, in ? ImportError: No module named qt i hope i've provided enough details -- warm regards, Pradnyesh Sawant

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Problem installing mysql on RHEL 4
by Shubham Saxena 16 Dec '06

16 Dec '06

I am trying to install MySQL-server-4.0.16-0 on RHEL 4 but am getting the error shown below. I also tried again downloading and installing but same problem. MySQL-client-4.0.16-0 is also installed. [root@test tmp]# rpm -ivh MySQL-server-4.0.16-0.i386.rpm warning: MySQL-server-4.0.16-0.i386.rpm: V3 DSA signature: NOKEY, key ID 5072e1f5 Preparing... ########################################### [100%] error: %pre(MySQL-server-4.0.16-0.i386) scriptlet failed, exit status 255 error: install: %pre scriptlet failed (2), skipping MySQL-server-4.0.16-0 Any suggestions will be helpful. Thank you. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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Sify broadband connection on Linux RHES 4
by Samir 16 Dec '06

16 Dec '06

Dear List, Do any of you use Sify Broadband Connection on Linux RHES 4?If anybody is using can you tell me how do u use it? I ve got the connection from local cable operator who has given me one .exe which when installed creates one icon on desktop and when opened that application need to mention username and password to connect to the internet. On windows i m able to use internet but i want to use on Linux.The local cable operator has denied any support on Linux.So anybody in the list can guide me plz for the same. -- Friends are like an treasure,so if you want to become rich in your life make as many friends as possible in the life. Samir.A.Sanghvi [B.E. in EXTC] 9820812842

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Sarge R4
by jtd 16 Dec '06

16 Dec '06

Downloaded two dvd isos for sarge R4. Havent tested it out yet. If any one is interested get me two branded dvd blanks and collect two sony 8x dvds with the abv. -- Rgds JTD

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Re: [ILUG-BOM] Sify broadband connection on Linux RHES 4
by Vihan Pandey 15 Dec '06

15 Dec '06

> Yeah, duh. I edited the init script the Gentoo way ;) i kind of expected you to say that ;-) > > > [B.E. in EXTC] > > > > i give you even more sympathy ;-) Sorry, i say that to ANYONE who makes > it > > a point to mention they are a B.E ;-) > > I make it a point to mention that I'm SSC from a Marathi medium school. i'll be sure to remember the day(though it is highly unlikely) i have enough $$$ to call myself a venture captalist and then we can make history ;-) till then hack away... Regards, - vihan

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Linuxers December 2006