🌐 Mailman 3 August 2007 - Python-list - python.org

Emacs + python
by Hadron Aug. 1, 2007

Aug. 1, 2007

Could anyone put me on the right track to developing Python with emacs please : modes to consider, debugging etc hopefully all within emacs. Any help and shared experiences much appreciated.

3 2

Is shelve/dbm supposed to be this inefficient?
by Joshua J. Kugler Aug. 1, 2007

Aug. 1, 2007

I am using shelve to store some data since it is probably the best solution to my "data formats, number of columns, etc can change at any time" problem. However, I seem to be dealing with bloat. My original data is 33MB. When each row is converted to python lists, and inserted into a shelve DB, it balloons to 69MB. Now, there is some additional data in there namely a list of all the keys containing data (vs. the keys that contain version/file/config information), BUT if I copy all the data over to a dict and dump the dict to a file using cPickle, that file is only 49MB. I'm using pickle protocol 2 in both cases. Is this expected? Is there really that much overhead to using shelve and dbm files? Are there any similar solutions that are more space efficient? I'd use straight pickle.dump, but loading requires pulling the entire thing into memory, and I don't want to have to do that every time. [Note, for those that might suggest a standard DB. Yes, I'd like to use a regular DB, but I have a domain where the number of data points in a sample may change at any time, so a timestamp-keyed dict is arguably the best solution, thus my use of shelve.] Thanks for any pointers. j -- Joshua Kugler Lead System Admin -- Senior Programmer http://www.eeinternet.com PGP Key: http://pgp.mit.edu/ ID 0xDB26D7CE

2 2

Doc
by Bell Aug. 1, 2007

Aug. 1, 2007

1 0

Re: Where do they tech Python officialy ?
by aleax＠mac.com Aug. 1, 2007

Aug. 1, 2007

Alex Popescu <nospam.themindstorm(a)gmail.com> wrote: ... > > and you will both learn a lot _and_ acquire "professional experience" > > that any enlightened employer will recognize as such. > > It depends :-). In my experience I met employers being concerned by my > implication in the oss world :-). Considering that even the King of Proprietary Software, Microsoft, now happily hires major Open Source figures such as Jim Hugunin (MS was also a top-tier sponsor at the recent OSCON, with both managerial and senior technical employees giving keynotes and tech talks), it boggles the mind to think about which kind of company would instead be "concerned" by a candidate's OS experience. > > That will take a > > while, but not as long as getting a college degree (and it will be far > > cheaper than the degree). > > I don't know much about the open community in Python world, but in Java > world becoming a project member may be more difficult than getting a > degree (or close to :-)) ). In a major project, you will of course have to supply useful contributions as well as proving to have a reasonable personality &c before being granted committer privileges; and a few projects (centered on a group of committers employed by a single firm or on an otherwise close-knit small clique) are not very open to the outside world at all. But (at least wrt projects using Python, C, C++ -- I have no experience of opensource projects focused on Java instead) that is the exception, not the rule. Alex

2 1

Re: Wing IDE for Python v. 3.0 beta1 released
by Paul Boddie Aug. 1, 2007

Aug. 1, 2007

Steve Holden wrote: > > I can't think of any other products I use where you can contact the > support team from right inside the software. And get answers without > paying per-incident support fees! Proprietary products, right? A lot of KDE applications have a "Report Bug..." item in the "Help" menu, for example. Perhaps you're thinking of the same kind of thing. Paul

2 1

split a string of space separated substrings - elegant solution?
by Helmut Jarausch Aug. 1, 2007

Aug. 1, 2007

Hi, I'm looking for an elegant solution to the following (quite common) problem: Given a string of substrings separated by white space, split this into tuple/list of elements. The problem are quoted substrings like abc "xy z" "1 2 3" "a \" x" should be split into ('abc','xy z','1 2 3','a " x') For that, one probably has to protect white space between quotes, then split by white space and finally converted the 'protected white space' to normal white space again. Is there an elegant solution - perhaps without using a lexer and something else. With regular expressions alone it seems clumsy. Many thanks for a hint, Helmut Jarausch Lehrstuhl fuer Numerische Mathematik RWTH - Aachen University D 52056 Aachen, Germany

7 6

Re: Bug in Time module, or in my understanding?
by Paul Boddie Aug. 1, 2007

Aug. 1, 2007

Joshua J. Kugler wrote: > I am getting results like these with the time module: > > >>> import time > >>> int(time.mktime(time.strptime('2007-03-11 02:00:00', '%Y-%m-%d %H:%M:%S'))) > 1173610800 > >>> int(time.mktime(time.strptime('2007-03-11 03:00:00', '%Y-%m-%d %H:%M:%S'))) > 1173610800 > >>> time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(1173610800)) > '2007-03-11 03:00:00' This is quite a nice test case, actually. :-) > I know it probably has something to do with daylight savings, but how can I > get back out that which I put in? The times concerned are all standard > time, so how can I keep the time module from asserting its belief that I > want to convert to daylight savings? Well, I think that if you inspect the result of strptime, you'll see that the last element of the time "tuple" - in fact, the tm_isdst member of a time "structure" - is set to -1: >>> time.strptime('2007-03-11 02:00:00', '%Y-%m-%d %H:%M:%S') (2007, 3, 11, 2, 0, 0, 6, 70, -1) >>> time.strptime('2007-03-11 03:00:00', '%Y-%m-%d %H:%M:%S') (2007, 3, 11, 3, 0, 0, 6, 70, -1) What is likely to happen when such results are passed to mktime is that the underlying library function will use its discretion in determining whether daylight savings time is in operation or not. > Incidentally, it only happens with times on 2007-03-11 from 02:00:00 to > 02:59:59, and not with time data from past years. This suggests that the timezone database is being used to provide the results. In fact, you can override the behaviour of mktime by constructing time tuples or structures with other values for the last element or tm_isdst respectively: >>> time.mktime((2007, 3, 11, 2, 0, 0, 6, 70, -1)) 1173574800.0 >>> time.mktime((2007, 3, 11, 2, 0, 0, 6, 70, 0)) 1173574800.0 >>> time.mktime((2007, 3, 11, 2, 0, 0, 6, 70, 1)) 1173571200.0 >>> time.mktime((2007, 3, 11, 3, 0, 0, 6, 70, -1)) 1173578400.0 >>> time.mktime((2007, 3, 11, 3, 0, 0, 6, 70, 0)) 1173578400.0 >>> time.mktime((2007, 3, 11, 3, 0, 0, 6, 70, 1)) 1173574800.0 By asserting tm_isdst as being 0, the usual apparent interval between the times is preserved. Paul

2 1

force unicode strings
by Thomas Guettler Aug. 1, 2007

Aug. 1, 2007

Hi, is it possible to force all non ascii strings to be unicode strings somehow? Sometimes I forget that I need to write u'...' if the string contains an umlaut. I get an exception in django later. But since the exception does not show the string it is hard to find it. Is it possible to loop over all strings the interpreter has parsed? Pure ascii strings are OK. Thomas -- Thomas Güttler, http://www.thomas-guettler.de/ http://www.tbz-pariv.de/ E-Mail: guettli (*) thomas-guettler + de Spam Catcher: niemand.leermann(a)thomas-guettler.de

3 2

A way to re-organize a list
by beginner Aug. 1, 2007

Aug. 1, 2007

Hi Everyone, I have a simple list reconstruction problem, but I don't really know how to do it. I have a list that looks like this: l=[ ("A", "a", 1), ("A", "a", 2), ("A", "a", 3), ("A", "b", 1), ("A", "b", 2), ("B", "a", 1), ("B", "b", 1)] What I want to do is to reorganize it in groups, first by the middle element of the tuple, and then by the first element. I'd like the output look like this: out=[ [ #group by first element "A" [("A", "a", 1), ("A", "a", 2), ("A", "a", 3)], #group by second element "a" [ ("A", "b", 1), ("A", "b", 2)], #group by second element "b" ], [ #group by first element "B" [("B", "a", 1)], [("B", "b", 1)] ] ] All the solutions I came up with are difficult to read and even harder to go back and change, and I just feel are too complicated for such a simple problem. I am wondering if anyone here has some insight. If there is a 'functional' way to do this, it would be even greater. Thanks, Geoffrey

6 7

Re: Filemaker interactions
by Ian Witham Aug. 1, 2007

Aug. 1, 2007

On Aug 2, 10:13 am, Jay Loden <pyt...(a)jayloden.com> wrote: > Ian Witham wrote: > > Hello, > > > I'm hoping someone here can put me on the right track with some broad > > concepts here. > > > What I am hoping to achieve is a simple HTML page to be served over > > our company LAN, into which the users (Real Estate Agents) can enter a > > property address or reference number. > > > My next thought was to have a Python CGI script query our filemaker > > database of property listings, construct a PDF from the relevant > > information, and finally return this PDF to the user. > > > At no stage do I want the user to have unfettered access to the > > database or the ability to alter/delete records. > > > My question is: what is the most appropriate way for my script to > > interact with Filemaker? Can this be done with Filemaker Pro 6? > > > According to the Filemaker Help, the "Local Data Access Companion" > > shares the FileMaker Pro database with ODBC-compliant applications on > > the same computer. Is this the right option? > > > Can my CGI script be an ODBC client? How? Would it need to be > > Filemaker specific code or does ODBC have a standardised format? > > > I'm grateful for any advice and a nudge in the right direction. > > > Ian. > > I don't know if this helps, but there is a PyFileMaker module for Python for interacting with FileMaker:http://www.sourcefiles.org/Programming/Development/Modules/Python…... > > That seems to be the only still working link to the module I can find, so I'm guessing it's not in active development. > > -Jay Thanks for that. I've come across it before but never found a working link! I'll let you know how I get on. Ian.

1 0