🌐 Mailman 3 September 2002 - Tutor - python.org

Backslashes inside of variable
by Phoebus Nov. 24, 2003

Nov. 24, 2003

I am running Python 2.2 on Win2k. I have a program which writes a filename, with backslashes to a file, along with other stuff. I read the file in using readlines() and put each line into a variable. My problem is I want to use the filename, but I can't use it because of the backslashes. I know about doing open(r"d:\test\file.txt","w") or even open(`d:\test\file.txt`,"w"), but the filename is inside of a variable so when I do open(filename,'w'), I have problems. Can anyone help? Thanks, Steve --

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sorting into lists
by Tim Wilson Jan. 11, 2003

Jan. 11, 2003

Hey everyone, Let's say I've got a list like the following: l = [1, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4] I'm trying to figure out a good way to turn this list into [[1, 1, 1], [2, 2], [3, 3, 3, 3], [4, 4]] Any ideas? -Tim -- Tim Wilson | Visit Sibley online: | Check out: Henry Sibley HS | http://www.isd197.org | http://www.zope.com W. St. Paul, MN | | http://slashdot.org wilson(a)visi.com | <dtml-var pithy_quote> | http://linux.com

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FW: Embedding Python
by BELSEY, Dylan Dec. 5, 2002

Dec. 5, 2002

Hi Tutor list, I posted the below mail last week and haven't seen any replies on the topic so I am not sure if it got through or if the questions were out of the scope of this list. If it is out of scope, any suggestions to what list would be more appropriate. Further to the information provided, I compiled the code in "Release" mode and still obtained the same error. When I refer to error I mean the 'import site' failure message. I would appreciate any help on this. Thanks, Dylan > -----Original Message----- > From: BELSEY, Dylan > Sent: Wednesday, 24 July 2002 15:51 > To: tutor(a)python.org > Subject: Embedding Python > > Hi, > I am attempting to try and get the embedding of Python running on my > system (WinNT). I am using VC++ and I copied the code from "5.1 Very High > Level Embedding" within "Extending and Embedding the Python Interpreter" > from the Python docs. I have also installed the latest release of Python, > version 2.3a0. The code from the documentation is pasted below: > > #include <Python.h> > > int > main(int argc, char *argv[]) > { > Py_Initialize(); > PyRun_SimpleString("from time import time,ctime\n" > "print 'Today is',ctime(time())\n"); > Py_Finalize(); > return 0; > } > > It compiles OK but when I go to run it I get the following error: > > 'import site' failed; use -v for traceback > Today is Wed Jul 24 15:39:04 2002 > Press any key to continue > > Any ideas why this error is occurring. Has anyone seen this error > and if so why is it occurring? The code is compiled in debug mode so > maybe the error is an artefact of that?? I have noticed that when I put > the produced executable in the directory where python.exe lives I don't > get the error. Unfortunately I don't know enough about the guts of Python > to follow this discovery through. > Any help would be appreciated. > Dylan

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Is there a file creator?
by S A Oct. 7, 2002

Oct. 7, 2002

Is there a function or module that creates an empty file like the unix command "touch" does? Thanks. SA "I can do everything on my Mac that I used to do on my PC, plus alot more ..." -Me ------------------------------------------------------------ Free, BeOS-friendly email accounts: http://BeMail.org/ BeOS News and Community: http://www.BeGroovy.com/ --------------------------------------------------------------------- Express yourself with a super cool email address from BigMailBox.com. Hundreds of choices. It's free! http://www.bigmailbox.com ---------------------------------------------------------------------

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complex file parsing
by Tim Wilson Oct. 3, 2002

Oct. 3, 2002

Hi everyone, I'm wondering if some of the experts on this list have some advise regarding more complex parsing of files. Here's the scenario: I'm a Ph.D. student in eduation, specifically Instructional Systems and Technology. I'm taking a class right now where we are supposed to survey the literature in our field and find trends, summarize what sort of work is being done, etc. Being a geek I naturally gravitate toward automation for tasks like this. :-) I do the searches in a large database of education-related articles called ERIC (see http://www.askeric.org/ for an example of one interface to the database). I can export the results of my search to a format compatible with EndNote (http://www.endnote.com/). I'm going to include a snippet of the resulting file below. What I'd like to know is if there's a decent chance of creating a parser that can pull out the data from this record. I'm particularly interested in the Descriptor field which consists of one or more major descriptors and one or more minor descriptors. Of course, separating all the useful bits would be handy. I wonder if this would be an application where creating an XML file would be useful? Anyway, here's the file. I'd love to get some comments from everyone here. -Tim Database: ERIC Ownership: FirstSearch indicates your institution subscribes to this publication. Libraries that Own Item: 149Connect to the catalog at University of Minnesota Libraries Accession No: EJ646012 Author(s): Kumar, David D. ; Altschuld James W. Title: Complementary Approaches to Evaluation of Technology in Science Education. Source: Journal of Science Education and Technology v11 n2 p179-191 Jun 2002 Standard No: ISSN: 1059-0145 Clearinghouse: SE566729 Language: English Abstract: Discusses an interesting and relevant case involving two distinct systematic evaluations, traditional as well as somewhat nontraditional, of a science teacher education project with a heavy technology emphasis. Reports the complexity of evaluating technology projects and the multifaceted ways in which the evaluation endeavor could be approached. (Contains 23 references.) (Author/YDS) SUBJECT(S) Descriptor: (Major): Educational Technology Evaluation Methods Teacher Education (Minor): Higher Education Science Education Science Teachers Document Type: Journal Article (CIJE) Record Type: 080 Journal Articles; 143 Reports--Research Announcement: CIJSEP2002 Provider: OCLC Database: ERIC --------------------------------------------------------------------------------+-------------------------------------------------------------------------------+----------------------------------------- Ownership: FirstSearch indicates your institution subscribes to this publication. Libraries that Own Item: 149Connect to the catalog at University of Minnesota Libraries Accession No: EJ646006 Author(s): Marbach-Ad, Gili ; Sokolove, Phillip G. Title: The Use of E-Mail and In-Class Writing To Facilitate Student-Instructor Interaction in Large-Enrollment Traditional and Active Learning Classes. Source: Journal of Science Education and Technology v11 n2 p109-119 Jun 2002 Standard No: ISSN: 1059-0145 Clearinghouse: SE566723 Language: English -- Tim Wilson | Visit Sibley online: | Check out: Henry Sibley HS | http://www.isd197.org | http://www.zope.com W. St. Paul, MN | | http://slashdot.org wilson(a)visi.com | <dtml-var pithy_quote> | http://linux.com

3 2

an error on recursion depth
by Andrea Valle Oct. 2, 2002

Oct. 2, 2002

Hi list, my program stops with this: RuntimeError: maximum recursion depth exceeded Why? I used the program in Python 1.5.2.: never happened. I think I already used it also for exactly the same task (same parameters, same complexity) also in 2.1. It's the first time it breaks. How can I avoid it? thank you -a- tutor-admin(a)python.org PS:(down I attach the whole final part: the fisrt line is repeat alot of times and then you have the ending part) File "C:\PROGRA~2\Python\grafoma_geo_quad_set.py", line 42, in percorri_arco tre_punti=grafista0.tre_punti(perc, vel, dur) File "C:\PROGRA~2\Python\grafista0.py", line 186, in tre_punti print spazio File "C:\Programmi\Python\Tools\idle\PyShell.py", line 679, in write self.shell.write(s, self.tags) File "C:\Programmi\Python\Tools\idle\PyShell.py", line 666, in write OutputWindow.write(self, s, tags, "iomark") File "C:\Programmi\Python\Tools\idle\OutputWindow.py", line 37, in write self.text.insert(mark, s, tags) File "C:\Programmi\Python\Tools\idle\Percolator.py", line 25, in insert self.top.insert(index, chars, tags) File "C:\Programmi\Python\Tools\idle\PyShell.py", line 146, in insert UndoDelegator.insert(self, index, chars, tags) File "C:\Programmi\Python\Tools\idle\UndoDelegator.py", line 81, in insert self.addcmd(InsertCommand(index, chars, tags)) File "C:\Programmi\Python\Tools\idle\UndoDelegator.py", line 116, in addcmd cmd.do(self.delegate) File "C:\Programmi\Python\Tools\idle\UndoDelegator.py", line 219, in do text.insert(self.index1, self.chars, self.tags) File "C:\Programmi\Python\Tools\idle\ColorDelegator.py", line 73, in insert self.notify_range(index, index + "+%dc" % len(chars)) File "C:\Programmi\Python\Tools\idle\ColorDelegator.py", line 94, in notify_range self.after_id = self.after(1, self.recolorize) File "C:\PROGRA~2\Python\lib\lib-tk\Tkinter.py", line 442, in after name = self._register(callit) File "C:\PROGRA~2\Python\lib\lib-tk\Tkinter.py", line 988, in _register f = CallWrapper(func, subst, self).__call__ RuntimeError: maximum recursion depth exceeded Andrea Valle via Lanzo 108 10073 - Ciriè (TO) ITALIA 011/921 45 84 - 349/55 47 343

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(no subject)
by Oren Levy Oct. 1, 2002

Oct. 1, 2002

Hi, I need your help I have the example of "spam.c" It complie & link well to dll (Im using MS-Visual studio 6) But I didn't understand how to use it ?,Where I need to put the files "spam.dll" and "spam.h"? tnx Oren

2 1

help How do I use a program I built in linux
by Peter Dudleston Oct. 1, 2002

Oct. 1, 2002

Help Hello Everyone I have decided to join the linux revolution and I need some help I have python2.2 pre-installed with this version of linux "mandrake" and I was wondering what do I type at the shell to run my programs do I need to make a new directory because no matter what I change the directory to I can't run my programs for example I have one called now which just tells you the time and I saved it as now.py and I can't get it to run no matter what it says that the command doesn't exist does anyone have anything they can tell me "keep in mind I'm a very newbie to this envirment" so if you could explain it in lame mans terms I would really appreciate it thanks for all you help everyone and talk to you all soon Sincerely Danny D _________________________________________________________________ Chat with friends online, try MSN Messenger: http://messenger.msn.com

2 1

[Fwd: re: turn a file into a dictionary]
by Colin Campbell Sept. 30, 2002

Sept. 30, 2002

-------- Original Message -------- Subject: re: turn a file into a dictionary Date: Sun, 29 Sep 2002 12:29:07 +0000 From: Charlie Clark <charlie(a)begeistert.org> To: tutor(a)python.org CC: CCampbell(a)ede.org References: <20020929093802.26719.4729.Mailman(a)mail.python.org> <snipped some embarassment!) Magnus has already answered the question but I thought I'd mention a couple of alternatives. First of all, as Magnus points out, you could do: myFileText = file(filename).read() d = eval("{ %s }" % myFileText) He advises you against this - the reason being that 'eval' won't do any security checking. It's conceivable, therefore, that your file contains some text will might be dangerous when run as Python code. This kind of security risk is common to all programming languages notably cgi and SQL. What do you want to do with your file? ie. how do you want to manage data in the future: by direct manipulation of the textfile in a text editor or through your program? If you still need to edit the textfile you're best following Magnus' suggestion. If not you will might consider using the pickle or shelve module to store your data and thus avoid the overhead of converting from string to dictionary and back again. Pickle and shelve use textfiles to store binary data such as dictionaries. Pickle is a generic tool for storing all kinds of Python objects in textfiles whereas shelve is specifically for dictionaries. You can edit the textfiles thus created if you are really careful but it's not advisable. XML-Pickle may give you the best of both worlds allowing you to manage your data either in a text editor or in a program. The file is an access control list for a set of financial statements, consisting of sheets in an Excel workbook. At present, I have a VBA macro which gets username from the network login, looks them up in the ACL, then hides all but the permitted sheets. The macro is stored in the same workbook, so it is defeated by disabling macros. I could simply build another workbook to contain the macro only, and have it act on the financial statements, but I want to combine all my reporting tools behind a Python front end. The ACL file is relatively static and small, so I think what I will wind up doing is a cross between Magnus' and Charlie's advice: I'll use interactive Python one time to create and maintain the dictionary, then shelve it, so the front-end to the report system just needs to unshelve it. Many thanks to both Magnus and Charlie for patiently dealing with chowder-headed ideas! Colin -- A closed mouth gathers no feet. -Unattributed

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RE: [Tutor] classes and inheritance
by alan.gauld＠bt.com Sept. 30, 2002

Sept. 30, 2002

PMFJI America was great, but I'm back and got this was my first tutor email after resuming the feed... > class User: > data: > name (used for saving and file name) > passwrd > actions: > get name > get passwrd Recall responsibility driven design is the key to good OO. What are the responsibilities of the objects, not the data they contain? Now maybe a User object has the responsibility to manage user names/passwords but what else does it DO? Those are the methods you need to focus on, then just add the necessary data to support that. Thus you need change password as a method probably. But maybe also you need to monitor status of users - alive/dead/numer of lives etc depending on the rules of the game... I could be way off line here, but every time I see a class where the only methods are get/set methods of the data I get nervous. Its nearly always the wrong design. As regards the subclasses you don't need to repeat the data/operations since they are already specified when you say you inherit from User... Finally I concur with the bottom comment about instantiating abstract classes. You might use the subclasses *as if* they were higher level abstracts but you would likely never instantiate an abstract directly. Alan G.

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