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

Tutorials on Jinja
by Saurabh July 15, 2013

July 15, 2013

Hi All, I am trying to move my application on a MVC architecture and plan to use Jinja for the same. Can anyone provide me with few quick links that might help me to get started with Jinja? Thanks, Saby

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Re: python for loop
by Steven D'Aprano July 10, 2013

July 10, 2013

On Wed, 01 Apr 2009 04:39:26 +0100, Rhodri James wrote: > Dragging this back to the original topic, you clearly find starting list > indices from zero unintuitive. To me, with a mathematical background, > it's not just intuitive, it's correct. All sorts of useful properties > fall out from that, not the least of which is the fact that > "a[0:len(a)]" slices the whole of a list. But some non-useful properties fall out of that too. Want the fifth item? a[5] gives you the *sixth* item, which is weird, so you have to use a[5-1] to get the fifth item. There is a major clash between the names of ordinals in human languages and zero-based counting. In human languages, the Nth-ordinal item comes in position N. You can keep that useful convention with zero-based counting by inventing the ugly word "zeroth", but that just leads to bizarro-talk like "the zeroeth item comes first, the first item comes second, and so on". a[0:len(a)] is legal, a[0] is legal, but surprisingly a[len(a)] is an error. Despite coming from a Pascal background, I've come to appreciate and prefer zero-based indexing for programming. But I'm not blind to the disadvantages. I'll often work out an algorithm using pencil and paper and counting from one, and then subtract one to get zero-based indexes. There are advantages and disadvantages to both systems, but on balance, I think that zero-based is a better system for programming, and one-based for natural language. -- Steven

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Coping with cyclic imports
by Torsten Bronger July 6, 2013

July 6, 2013

Hallöchen! I have a rather fat module that represents a document parser -- inline elements, block elements, and the like. Now I want to split it into many modules to make everything more manageable. But at the moment I don't see how to avoid cyclic imports: A document element A, which is represented my module parser.A, may contain the element B, as defined in parser.B. And vice versa. So both modules must import each other, as far as I can see. I know that cyclic imports work in Python under certain circumstances. Can anyone refer me to a page which explains *when* this works? Because at least once, the imported module was not "finished" and thus largely unusual. Thank you! Tschö, Torsten. -- Torsten Bronger, aquisgrana, europa vetus Jabber ID: bronger(a)jabber.org (See http://ime.webhop.org for further contact info.)

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June 12, 2013

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global variable not working inside function. Increment
by Helvin May 13, 2013

May 13, 2013

Hi, This increment thing is driving me nearly to the nuts-stage. > < I have a function that allows me to pick points. I want to count the number of times I have picked points. global no_picked no_picked = 0 def picked(object, event): no_picked += 1 print no_picked Error msg says: UnboundLocalError: local variable 'no_picked' referenced before assignment For some reason, no_picked does not increment, but the printing statement works. Do you know why? (I'm actually writing this for a vtkrenderwindowinteractor.) Helvin

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how to get next month string?
by Yinghe Chen May 2, 2013

May 2, 2013

Hi, Could someone help on how to use python to output the next month string like this? "AUG07", suppose now is July 2007. I think also need to consider Dec 07 case, it is supposed to output as below: "JAN07". datetime module seems not supporting the arithmatic operations, any hints? Thanks in advance, Yinghe Chen

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Re: Print to an IPP printer (pkipplib?)
by Martin Gregorie April 10, 2013

April 10, 2013

On Fri, 15 Oct 2010 15:28:10 -0400, Adam Tauno Williams wrote: > I've found the module pkipplib which seems to work well for things like > interrogating an IPP (CUPS) server. But is there a way to send a print > job to an IPP print queue? [and no, the local system knows nothing about > the print architecture so popen....lp is not an option]. I just want to > send the data from a file handle to a remote IPP queue as a print job. See RFC 2910. -- martin@ | Martin Gregorie gregorie. | Essex, UK org |

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Calling J from Python
by Gosi March 9, 2013

March 9, 2013

It is quite easy to call J from Python http://groups.google.com/group/J-Programming/browse_thread/thread/5e84b7566…

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toy list processing problem: collect similar terms
by Xah Lee Feb. 6, 2013

Feb. 6, 2013

here's a interesting toy list processing problem. I have a list of lists, where each sublist is labelled by a number. I need to collect together the contents of all sublists sharing the same label. So if I have the list ((0 a b) (1 c d) (2 e f) (3 g h) (1 i j) (2 k l) (4 m n) (2 o p) (4 q r) (5 s t)) where the first element of each sublist is the label, I need to produce: output: ((a b) (c d i j) (e f k l o p) (g h) (m n q r) (s t)) a Mathematica solution is here: http://xahlee.org/UnixResource_dir/writ/notations_mma.html R5RS Scheme lisp solution: http://xahlee.org/UnixResource_dir/writ/Sourav_Mukherjee_sourav.work_gmail.… by Sourav Mukherjee also, a Common Lisp solution can be found here: http://groups.google.com/group/comp.lang.lisp/browse_frm/thread/5d1ded8824b… anyone care to give a solution in Python, Perl, javascript, or other lang? am guessing the scheme solution can be much improved... perhaps using some lib but that seems to show scheme is pretty weak if the lib is non-standard. Xah ∑ xahlee.org ☄

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Re: problems trying to build python 2.6 as a shared library
by Marco Nawijn Jan. 19, 2013

Jan. 19, 2013

On Sep 25, 1:08 pm, Chris Withers <ch...(a)simplistix.co.uk> wrote: > Hi All, > > I'm trying to build Python 2.6 as a shared library, so I did: > > ./configure --enable-shared > make > make altinstall > > No obvious signs of failure, but when I try and use the resulting > python, I get: > > python2.6: error while loading shared libraries: libpython2.6.so.1.0: > cannot open shared object file: No such file or directory > > Why might that be? > > cheers, > > Chris > > -- > Simplistix - Content Management, Batch Processing & Python Consulting > -http://www.simplistix.co.uk Hello Chris, The dynamic loader cannot find the python shared library. There are at least 2 options: 1. Add path that contains the shared library to the LD_LIBRARY_PATH environment variable. In a bash shell this can be accomplished by: export LD_LIBRARY_PATH=/path/to/python_shared_lib: $LD_LIBRARY_PATH 2. Add path to dynamic linker configuration file. This typically is in '/etc/ld.so.conf'. See man page for ld for more information. Note that I assumed that you are on a Unix/Linux machine. Regards, Marco

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