Mark Lutz Python interview
Python author and trainer Mark Lutz will be interviewed on the radio show Tech Talk this Sunday, October 1st, at 6PM Eastern time. He'll be answering questions about Python, his books, and his Python training services. For more details about the show, see Tech Talk's website at http://techtalk.imi-us.com. You can also listen to the live webcast of the show on KFNX's website, http://www.1100kfnx.com. --Python Training Services http://home.earthlink.net/~python-training -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Python Instructor
Hello, My name is Reni Abraham and am the department chair for DIgital Gaming and Simualtion at Houston Community College. I am looking for a Python instructor, ASAP. If you know anyone that can and insterested in teaching Python, please send me their contact information. Thank you. Reni***Reni AbrahamChair, Digital Gaming and Simulation DepartmentHouston Community College - Southwest** Office: Student Success Center - F02** West Loop Campus ** ** Address: 5601 West South Loop** Houston, Texas 77081** ** Mail Code: 1587 Telephone: (713) 718 - 5728 Email: [EMAIL PROTECTED]** ** Department Website: http://swc2.hccs.edu/digiGAME ** *** -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Re: Python/UNO/OpenOffice?
[EMAIL PROTECTED] wrote: Are then any currently active and reasonably mature Python plugins/ apis/whatever for programming/scripting OpenOffice? The page I've found is http://udk.openoffice.org/python/python-bridge.html, but it was last updated more than a year ago. Thanks, Ken I don't believe that information is out-of-date. I use the python-bridge with the OpenOffice version 2.0.3 quite successfully. In my case I open a spread sheet and search around for and extract various values. It works just fine for me. Gary Herron -- http://mail.python.org/mailman/listinfo/python-list
Re: Python/UNO/OpenOffice?
That's what I would imagine. Kind of like calling some Microsoft Office COM/OLE methods in a wrapper. As long as the wrapper has most of the methods you need and the core COM/OLE calls don't change then that's a great start. Gary Herron wrote: [EMAIL PROTECTED] wrote: Are then any currently active and reasonably mature Python plugins/ apis/whatever for programming/scripting OpenOffice? The page I've found is http://udk.openoffice.org/python/python-bridge.html, but it was last updated more than a year ago. Thanks, Ken I don't believe that information is out-of-date. I use the python-bridge with the OpenOffice version 2.0.3 quite successfully. In my case I open a spread sheet and search around for and extract various values. It works just fine for me. Gary Herron -- http://mail.python.org/mailman/listinfo/python-list
The Python world tries to be polite [formerly offensive to another language]
Istvan Albert wrote: [...] ps. as for the title of this post, it is ironic that you are insulting another community while asking for no insults Perhaps so, but none the less comp.lang.perl has a demonstrable history of newbie-flaming. Don't know what it's like now, as it's years since I read that group, but they used to just love the smell of crisply-toasted newbie in the morning ;-) 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 -- http://mail.python.org/mailman/listinfo/python-list
Re: PATCH: Speed up direct string concatenation by 20+%!
Larry Hastings wrote: Fredrik Lundh wrote: so what does the benchmark look like if you actually do this ? Okay, timing this: x = for i in range(10): x += a t = x[1] # forces the concat object to render The result: Python 2.5 release: 30.0s Python 2.5 locally built: 30.2s Python 2.5 concat: 4.3s Improvement: 600% (1/7 of the time) /larry/ Interesting. Does a comparison also force it to render? If not, I wonder if comparisons might not end up slower. It does sound like memory usage might go through the roof with this technique under certain circumstances, so the more extensive your tests are the more likely you are to see the change actually used (I'm not convinced you'll persuade the developers to include this). Whether or not it does get incorporated I think it's a great demonstration of how amenable Python is to experimentation with alternate representations, and I think your project might make a very interesting PyCon paper for people who were thinking about joining the development effort but hadn't yet started. 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 -- http://mail.python.org/mailman/listinfo/python-list
Re: File I/O
Diez B. Roggisch wrote: Good to know that you can get drunk under any circumstances. +(++)1 heh! I have seen a bazillion bad xml/html parsing-hacks using regexes and the like, which stopped working after somehow the xml came all in one line, or some other implicit assumption about its layout failed to be met. Seriously, I fully agree with you. To manipulate X/HT/ML data reliably you need to use a parser. And usually the parser API is much cleaner and easier to work with than trying to cobble together regexps anyhow! Regards, Jordan -- http://mail.python.org/mailman/listinfo/python-list
Re: retry in exception
Sybren Stuvel wrote: Antoine De Groote enlightened us with: I hope I don't upset anybody by comparing Python to Ruby (again). Is there something like Ruby's retry keyword in Python? Please don't assume that everybody knows Ruby through and through... I didn't see any such assumption in that post. *I* don't know much Ruby, but it seems like a perfectly reasonable question, as I know many readers *are* proficient in that language. This is one of those cases where not posting at all would have saved everyone some time ;-) 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 -- http://mail.python.org/mailman/listinfo/python-list
Re: creating a small test server on my local computer
Mirco Wahab wrote: Thus spoke John Salerno (on 2006-09-29 21:13): ... My advice would be (because Apache installations on WinXP don't usually support Python (except pulling the whole thing into each CGI invocation) - download and install a VMWare Player This sounds a horribly complicated way of doing things. If you read the OP's post, it seems he is simply trying to serve straight HTML pages (but with Server Side Includes) locally for testing, rather than having to pester his operations guys to put them up on the company servers. If it's just HTML and SSI, then Apache is the easy answer on XP. The download is a simple .msi installer, and you'll just be able to drop the html files in the htdocs directory to start serving them. (http://httpd.apache.org/download.cgi) If you look at the docs for a majority of the Python webservers, they recommend putting them behind Apache for production use, and for good reason, Apache httpd is probably the most mature, stable and feature rich web server out there. (Incidentally, adding python support with mod_python is a breeze on XP - just another installer and uncommenting a couple of lines in the httpd.conf file. But then for actual python development it may be simpler to get started using a framework such as TurboGears or Django, which both have very good introductory tutorials.) -- http://mail.python.org/mailman/listinfo/python-list
why logging re-raise my exception and can't be caught?
I use a simple program to illustrate the problem: import logging def foo() : raise ValueError(foo) if __name__ == __main__ : try : foo() except ValueError : logging.exception(caught here) -- seems re-raise the exception and can't be caught print caught here --- just works. I'm expecting the exception to be caught silently, and print the msg to some place, if I comment out the logging statement, it just works, but now, the stack trace is printed as if the except statement was not there!! how could this happen, just weird.. can I make the logging module behave as I expected? tks in advance. daniel -- http://mail.python.org/mailman/listinfo/python-list
Re: storing variable names in a list before they are used?
John Salerno wrote: If I want to have a list like this: [(first_name, 'First Name:'), (last_name, 'Last Name:').] where the first part of each tuple is a variable name and the second part is a label for the user to see, such as a form like this: First Name: Last Name: (the variables would store whatever information is entered in the text boxes to the right of each label. I'm doing it this way so I can write a loop to construct my GUI components). how would I go about putting these variable names in a list? I know I can't leave them as above, but if I put them in as a string, then how do I later transform them into an actual variable for assign, such as: first_name = widget.get_text() Is there some kind of idiom that does this sort of work? Thanks. There are ways you can do this, but the best advice is don't. If you are putting names into a Python namespace that aren't known in advance then you also have to use similarly obscure techniques to access the variables, and you are running the risk that your code will collide whit a name of a variable already used in that namespace by your code. What's wring with just using a dict to store the values against the names? Dicts and namespaces have a lot of behaviour in common. regard 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 -- http://mail.python.org/mailman/listinfo/python-list
Re: The Python world tries to be polite [formerly offensive to another language]
Steve Holden wrote: Perhaps so, but none the less comp.lang.perl has a demonstrable history of newbie-flaming. Don't know what it's like now, as it's years since I read that group, but they used to just love the smell of crisply-toasted newbie in the morning ;-) C'mon! No reason why a newbie should be confused by a hyper-fatugly, err, hyper-fatarrow every now and then [1]! What, are newbies totally dense or something?! ;)) [1] http://www.nntp.perl.org/group/perl.perl6.language/25946 Regards, Jordan -- http://mail.python.org/mailman/listinfo/python-list
Re: DAT file compilation
Jay wrote: That cgi idea is really cool, but I don't have any web space to host the files. Plus the bandwidth required would be deadly. I think I'll just have to stick to the zip file idea. The problem with the read-only is that this program is aimed at a Windows audience. So don't call it something.zip. Since most Windows users rely on the registry to discern filetypes from extensions you will probably find in practice that very few actually poke about with your .dat file that's actually a zip. 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 -- http://mail.python.org/mailman/listinfo/python-list
Re: why logging re-raise my exception and can't be caught?
daniel [EMAIL PROTECTED] writes: I'm expecting the exception to be caught silently, and print the msg to some place Then why not use logging.error() ? URL:http://docs.python.org/lib/module-logging = error(msg[, *args[, **kwargs]]) Logs a message with level ERROR on the root logger. The arguments are interpreted as for debug(). exception(msg[, *args]) Logs a message with level ERROR on the root logger. The arguments are interpreted as for debug(). Exception info is added to the logging message. This function should only be called from an exception handler. = A 'try ... except' statement is not an exception handler. So, if you want to log the fact that an error occurred, it seems logging.error() is the correct choice. -- \I have one rule to live by: Don't make it worse. -- Hazel | `\ Woodcock | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: Hot new programming languages - according to the TIOBE index
vasudevram wrote: Ruby and Python are doing well, according to the latest TIOBE index. Doing well?? Ruby is up 14 points, relatively...ghea! ruby p0wns!11 ;) D is an interesting language, though, I must say. Looks like they did all the things right that C++ did wrong. Regards, Jordan -- http://mail.python.org/mailman/listinfo/python-list
Re: Python/UNO/OpenOffice?
[EMAIL PROTECTED] enlightened us with: Are then any currently active and reasonably mature Python plugins/ apis/whatever for programming/scripting OpenOffice? The page I've found is http://udk.openoffice.org/python/python-bridge.html, but it was last updated more than a year ago. Aside from what has already been said, it might be nice for you to read my article about OOo and Python at http://www.stuvel.eu/ooo-python ;-) Sybren -- Sybren Stüvel Stüvel IT - http://www.stuvel.eu/ -- http://mail.python.org/mailman/listinfo/python-list
Re: for: else: - any practical uses for the else clause?
Paul Rubin enlightened us with: height = 0 for block in stack: if block.is_marked(): print Lowest marked block is at height, height break height += block.height else: raise SomeError(No marked block) all_heights = [block.height for block in stack if block.is_marked()] if all_heights: height = sum(all_heights) else: raise SomeError(No marked block) Alternatively (lower memory usage for large list): all_heights = (block.height for block in stack if block.is_marked()) try: height = all_heights.next() height += sum(all_heights) except StopIteration: raise SomeError(No marked block) I must say that the for/else construct is a LOT more readable than the rewritten alternatives. Sybren -- Sybren Stüvel Stüvel IT - http://www.stuvel.eu/ -- http://mail.python.org/mailman/listinfo/python-list
Re: for: else: - any practical uses for the else clause?
Sybren Stuvel wrote: I must say that the for/else construct is a LOT more readable than the rewritten alternatives. +1 I just wish it had a more intuitive name like after: or then:, as else: seems like a choice between the loop and the other block (but really the choice is between StopIteration and break). Regards, Jordan -- http://mail.python.org/mailman/listinfo/python-list
Re: File I/O
Kirt wrote:
...
i dont wanna parse the xml file..
Just open the file as:
f=open('test.xml','a')
and append a line Body2abc/Body2 before tag /Top
The other guys are right - you should look at something like
ElementTree which makes this sort of thing pretty easy, and is robust.
But if you are sure that:
1) /Top is going to be on its own line (rather than something like
/Body1/Top)
2) the ending tag will *definitely* have no extraneous whitespace (e.g.
/ Top )
then the following will probably be the simplest solution:
f=open('test.xml')
out = []
for line in f:
if /Top in line:
out.append(Body2abc/Body2)
out.append(line)
f.close()
f_out = open(test.xml, w)
f.write(.join(out))
f_out.close()
If you're working with XML in any sort of quantity, then look into the
available XML tools - it will be worth your time.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Hot new programming languages - according to the TIOBE index
MonkeeSage wrote: vasudevram wrote: Ruby and Python are doing well, according to the latest TIOBE index. Doing well?? Ruby is up 14 points, relatively...ghea! ruby p0wns!11 ;) Sorry my fellow pythonistas! I didn't see that this was cross-posted. I was of course being silly, but I wanted to make that clear so as not to unduely offend! Regards, Jordan -- http://mail.python.org/mailman/listinfo/python-list
Re: The Python world tries to be polite [formerly offensive to another language]
MonkeeSage wrote: Steve Holden wrote: Perhaps so, but none the less comp.lang.perl has a demonstrable history of newbie-flaming. Don't know what it's like now, as it's years since I read that group, but they used to just love the smell of crisply-toasted newbie in the morning ;-) C'mon! No reason why a newbie should be confused by a hyper-fatugly, err, hyper-fatarrow every now and then [1]! What, are newbies totally dense or something?! ;)) [1] http://www.nntp.perl.org/group/perl.perl6.language/25946 My God, Perl 6 is going to be even less comprehensible that Perl 5, which was at least usable. Is »=« really a Perl6 operator? That's too funny! hoping-the-chevrons-were-emphasis-on-ly y'rs - 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 -- http://mail.python.org/mailman/listinfo/python-list
Re: why logging re-raise my exception and can't be caught?
daniel schrieb: I use a simple program to illustrate the problem: import logging def foo() : raise ValueError(foo) if __name__ == __main__ : try : foo() except ValueError : logging.exception(caught here) -- seems re-raise the exception and can't be caught print caught here --- just works. I'm expecting the exception to be caught silently, and print the msg to some place, if I comment out the logging statement, it just works, but now, the stack trace is printed as if the except statement was not there!! how could this happen, just weird.. can I make the logging module behave as I expected? For starters - reading the documentation. The logging.exception-call precisely is for printing the exception as if it was not caught at all. If you don't want that, don't use it - use one of the error, warn, info or debug calls. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: for: else: - any practical uses for the else clause?
Sybren Stuvel [EMAIL PROTECTED] writes: I must say that the for/else construct is a LOT more readable than the rewritten alternatives. They are all pretty ugly. I prefer the genexp version with a hypothetical is_empty function: all_heights = (block.height for block in stack if block.is_marked()) if is_empty(all_heights): raise SomeError(No marked block) heights = sum(all_heights) Python generators don't really work the right way for this though. I've been fooling around with Haskell, so these kinds of constructions seems more natural to me than explicit for loops. -- http://mail.python.org/mailman/listinfo/python-list
Re: MySQLdb for Python 2.5
Harold Trammel schrieb: Does anyone know the status of a version of MySQLdb that will work with Python 2.5? AFAICT, MySQLdb 1.2.1 builds and works just fine. Regards, Martin -- http://mail.python.org/mailman/listinfo/python-list
Re: why logging re-raise my exception and can't be caught?
Ben Finney wrote: [...] A 'try ... except' statement is not an exception handler. [...] Just as a matter of interest, what would your definition of an exception handler be, then? Specifically, what's the except clause for? The docs for looging.except should make it explicit that the exception will be re-raised. Of course it might be possible to do something hackish like try: ... except: try: logging.exception(...) except: pass which (although untested) should theoretically allow the catching (for a second time) of teh exception reraised by logging.exception(). 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 -- http://mail.python.org/mailman/listinfo/python-list
Re: why logging re-raise my exception and can't be caught?
thank your so much firstly. I feel really ashamed... I think I did read through all examples and docs, but I just took for granted that all the info(), warning(), debug() like functions behaves much alike except the level name.. so the description you listed really was ignored,, tks again for your help.. I do appreciate it. daniel -- http://mail.python.org/mailman/listinfo/python-list
Re: for: else: - any practical uses for the else clause?
Sybren Stuvel wrote: Paul Rubin enlightened us with: height = 0 for block in stack: if block.is_marked(): print Lowest marked block is at height, height break height += block.height else: raise SomeError(No marked block) all_heights = [block.height for block in stack if block.is_marked()] if all_heights: height = sum(all_heights) else: raise SomeError(No marked block) Alternatively (lower memory usage for large list): all_heights = (block.height for block in stack if block.is_marked()) try: height = all_heights.next() height += sum(all_heights) except StopIteration: raise SomeError(No marked block) I must say that the for/else construct is a LOT more readable than the rewritten alternatives. I like def blocks_til_mark(stack): for block in stack: if block.is_marked(): return yield block raise SomeError height = sum(block.height for block in blocks_til_mark(stack)) Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: why logging re-raise my exception and can't be caught?
Steve Holden wrote: Ben Finney wrote: [...] A 'try ... except' statement is not an exception handler. [...] Just as a matter of interest, what would your definition of an exception handler be, then? Specifically, what's the except clause for? The docs for looging.except should make it explicit that the exception will be re-raised. Of course it might be possible to do something hackish like try: ... except: try: logging.exception(...) except: pass which (although untested) should theoretically allow the catching (for a second time) of teh exception reraised by logging.exception(). Use the source, people. The exception is not reraised. The only effect of exception() versus error() is that exception() passes the exc_info=1 keyword argument to error() which means that the stack trace is added to the logging message. The default logger prints to stdout, which is why the stack trace is printed there too. (In the sense of the logging docs, an except:-clause *IS* an error handler). Georg -- http://mail.python.org/mailman/listinfo/python-list
Re: Automatic methods in new-style classes
The metaclass approach seems to be the one I was looking for. Thanks! Bert -- http://mail.python.org/mailman/listinfo/python-list
Re: Leave the putdowns in the Perl community, the Python world does not need them
I am also shocked by Fredrick Lundh's impoliteness and think he makes this group less friendly than I expected when I read this on http://www.python.org/community/lists/: Rudeness and personal attacks, even in reaction to blatant flamebait, are strongly frowned upon. People may strongly disagree on an issue, but usually discussion remains civil This should apply to anyone, from the newbie to the most valuable contributor to Python Regards, Pierre -- http://mail.python.org/mailman/listinfo/python-list
Re: for: else: - any practical uses for the else clause?
Paul Rubin wrote: Sybren Stuvel [EMAIL PROTECTED] writes: I must say that the for/else construct is a LOT more readable than the rewritten alternatives. They are all pretty ugly. I prefer the genexp version with a hypothetical is_empty function: all_heights = (block.height for block in stack if block.is_marked()) if is_empty(all_heights): raise SomeError(No marked block) Such a function would have to rebind the generator: def check_empty(items): items = iter(items) try: first = items.next() except StopIteration: return False return chain([first], items) all_heights = check_empty(all_heights) if not all_heights: raise SomeError heights = sum(all_heights) Python generators don't really work the right way for this though. You can make it work, but the result tends to be messy: from itertools import chain def raiseiter(exc, *args): raise exc(*args) yield None # unreachable def stop(): raise StopIteration height = sum(block.height for block in chain(stack, raiseiter(SomeError)) if (not block.is_marked()) or stop()) Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: for: else: - any practical uses for the else clause?
Peter Otten [EMAIL PROTECTED] writes: I like def blocks_til_mark(stack): for block in stack: if block.is_marked(): return yield block raise SomeError height = sum(block.height for block in blocks_til_mark(stack)) Oh my, I realize now that I mis-read the original, and my examples were all wrong. Shows how the explicit loop isn't necessarily so clear ;-). Note that unlike the original, the loop above fails to set height = 0 in the case where the exception gets raise. I'd maybe just scan the stack twice. The rescan is needed only if there can be blocks with height = 0. Otherwise, you can just raise SomeError if height == 0: height = sum(b.height for b in itertools.takewhile(lambda: not block.is_marked(), stack)) if height == 0 and True not in (b.is_marked() for b in stack): raise SomeError -- http://mail.python.org/mailman/listinfo/python-list
Re: for: else: - any practical uses for the else clause?
Peter Otten [EMAIL PROTECTED] writes: all_heights = (block.height for block in stack if block.is_marked()) if is_empty(all_heights): raise SomeError(No marked block) Such a function would have to rebind the generator: Yeah, that's what I mean about generators not working the right way. You can make it work, but the result tends to be messy: I think it's better underneath, but still syntactically ugly, to just defer the generator creation: all_heights = lambda: (block.height for block in stack if block.is_marked()) if is_empty(all_heights ()): raise SomeError(No marked block) height = sum(all_heights ()) Now sum and is_empty see two separate generators, so is_empty is straightforward: def is_empty(gen): try: gen.next() return True except StopIteration: return False -- http://mail.python.org/mailman/listinfo/python-list
Re: ruby %w equivalent
Nick Craig-Wood wrote:
These are snatched straight from perl. In perl they are spelt
slightly differently
Yup, they are; perl had _some_ good ideas; no doubt. ;)
In perl (and maybe in ruby I don't know) the { } can be replaced with
any two identical chars, or the matching pair if bracketty, so q/blah/
or q(blah).
Yes; same thing in ruby.
Regards,
Jordan
--
http://mail.python.org/mailman/listinfo/python-list
Escapeism
Usually I struggle a short while with \ and either succeed or give up. Today I'm in a different mood and don't give up. So here is my question: You have an unknown character string c such as '\n' , '\a' , '\7' etc. How do you echo them using print? print_str( c ) prints representation '\a' to stdout for c = '\a' print_str( c ) prints representation '\n' for c = '\n' ... It is required that not a beep or a linebreak shall be printed. First of all it has be remarked that it is impossible to a certain extent. That's because e.g. c = '\a' and c = '\7' do represent the same string but this ambiguity doesn't occur for many numbers. But lets weaken the requirement and fix a canonical representation in case of ambiguity. I'm still getting stuck here. -- http://mail.python.org/mailman/listinfo/python-list
Filter class
Hello NG, Curious to know whether exists a filter class. I'm doing some rough mail filtering on my own criteria, but I'm very new on programming and I like to find some clue on passing a config file of rules which will be regex by Python. TIA -- http://mail.python.org/mailman/listinfo/python-list
Re: for: else: - any practical uses for the else clause?
Paul Rubin wrote: Peter Otten [EMAIL PROTECTED] writes: all_heights = (block.height for block in stack if block.is_marked()) if is_empty(all_heights): raise SomeError(No marked block) Such a function would have to rebind the generator: Yeah, that's what I mean about generators not working the right way. You can make it work, but the result tends to be messy: I think it's better underneath, but still syntactically ugly, to just defer the generator creation: all_heights = lambda: (block.height for block in stack if block.is_marked()) You still need the stop() trick to omit the heights after the marked block. if is_empty(all_heights ()): raise SomeError(No marked block) height = sum(all_heights ()) Now sum and is_empty see two separate generators, so is_empty is straightforward: def is_empty(gen): try: gen.next() return True except StopIteration: return False Alternatively you can turn all_heights into a list (comprehension) which makes the test trivial. I think it will be interesting to see how Python 3000's emphasis on iterators will affect overall code complexity. Peter -- http://mail.python.org/mailman/listinfo/python-list
builtin regular expressions?
Hello, Can anybody tell me the reason(s) why regular expressions are not built into Python like it is the case with Ruby and I believe Perl? Like for example in the following Ruby code line = 'some string' case line when /title=(.*)/ puts Title is #$1 when /track=(.*)/ puts Track is #$1 when /artist=(.*)/ puts Artist is #$1 end I'm sure there are good reasons, but I just don't see them. Python Culture says: 'Explicit is better than implicit'. May it be related to this? Regards, antoine -- http://mail.python.org/mailman/listinfo/python-list
Re: Escapeism
Kay Schluehr wrote: Usually I struggle a short while with \ and either succeed or give up. Today I'm in a different mood and don't give up. So here is my question: You have an unknown character string c such as '\n' , '\a' , '\7' etc. How do you echo them using print? print_str( c ) prints representation '\a' to stdout for c = '\a' print_str( c ) prints representation '\n' for c = '\n' ... It is required that not a beep or a linebreak shall be printed. First of all it has be remarked that it is impossible to a certain extent. That's because e.g. c = '\a' and c = '\7' do represent the same string but this ambiguity doesn't occur for many numbers. But lets weaken the requirement and fix a canonical representation in case of ambiguity. I'm still getting stuck here. I don't understand the question. Wouldn't the canonical representation be repr(c) or repr(c)[1:-1]? Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: builtin regular expressions?
Antoine De Groote enlightened us with: Can anybody tell me the reason(s) why regular expressions are not built into Python like it is the case with Ruby and I believe Perl? They _are_ built into Python. Python ships with the 're' module. Python Culture says: 'Explicit is better than implicit'. May it be related to this? The creators of Python chose not to include an extention of the Python syntax for regular expressions. It's a lot simpler to have a straight-forward syntax, and simply pass the regular expressions to the appropriate functions. Sybren -- Sybren Stüvel Stüvel IT - http://www.stuvel.eu/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Escapeism
Kay Schluehr enlightened us with: Usually I struggle a short while with \ and either succeed or give up. Today I'm in a different mood and don't give up. So here is my question: You have an unknown character string c such as '\n' , '\a' , '\7' etc. How do you echo them using print? print_str( c ) prints representation '\a' to stdout for c = '\a' print_str( c ) prints representation '\n' for c = '\n' ... It is required that not a beep or a linebreak shall be printed. try print repr(c). Sybren -- Sybren Stüvel Stüvel IT - http://www.stuvel.eu/ -- http://mail.python.org/mailman/listinfo/python-list
Re: MySQLdb for Python 2.5
Harold Trammel wrote: Hi everyone, Does anyone know the status of a version of MySQLdb that will work with Python 2.5? I will accept a workaround if you know one. Thanks in advance. Harold Trammel I could not find a way around this requirement, but you will want to manually add libz to your building with this version. This seems to be how to do this when you run setup.py: python setup.py -lz [other args] install This is for mysqldb MySQL-python-1.2.1_p2 (which I believe is the latest). I built this a few days ago and finally tested today and got this terribly annoying (and apparently well documented) error: [stacktrace clipped] LookupError: unknown encoding: latin1_swedish_ci My setup: python 2.5, very old mysql servers (C. 2003?), mysqldb 1.2.1_p2. It seems the problem is related to mysqldb, but I'm not sure. I found the only real work-around here: http://mail.python.org/pipermail/python-list/2006-July/350408.html Its ugliness manifests in my code as such: ### # workaround function for problems with encoding ### def _csn(*args, **kwargs): return 'utf-8' ### # init_mysql() ### def init_mysql(the_db=some_db): adb = MySQLdb.connect( host=sql.some.institute.edu, # charset=utf8, # -- our mysql servers too old for this user=my_login, passwd=pa55w0rd, db=the_db ) adb.character_set_name = instancemethod(_csn, adb, adb.__class__) return adb This fix passes some initial rudimentary tests. No guarantees on proper handling of unicode. If you are using unicode, you may want to test it thoroughly with this fix and report your results (preferably on this comp.lang.python). James -- http://mail.python.org/mailman/listinfo/python-list
Re: ruby %w equivalent
hg wrote: But today ? what is the cost of replacing %w(blah blah) by Hi_I_Want_To_Split_The_String_That_Follows( blah blah) The latter is beginning to look like the Cocoa/NextStep framework. Perhaps we should give up scripting languages for ObjC? James -- http://mail.python.org/mailman/listinfo/python-list
Re: another distutils question
Thanks everyone, for your answers. They've been very helpful. Keith -- http://mail.python.org/mailman/listinfo/python-list
Re: windev vs python SOS
- python work on multiple platform (linux, mac, windows) A good point but it didn't interest him. Because we want to choose a language for prototyping. So multi platform is not enough. With Python the prototype _is_ the application. You just need to add a little bit of polishing (exception handling etc.) where required, maybe implement a speed-critical module in Pyrex, that's it. And for running a production application, cross-platform-ness _is_ important. Or what would you do when your customer wants to run his application not just on Windows, but on an embedded OS like VxWorks, QNX, or a _real_ server OS such as any proprietary Unix (including MacOS X), Linux, *BSD, OS/400 (or whatever it is called now), MVS... Can Windev interface with .net? For Python, there's Python.net (not Ironpython, that's a different thing). Can Windev interface with Java? For Python, there's JPype (not Jython, that's a different thing as well). Does Windev interface with JMS, Java RMI, SAP RFC, mqseries and other middleware? Can you build COM clients and servers in Windev? Can you build Corba clients and servers in Windev? Can Windev interface natively with nearly every relational database on the planet? Can you easily access any C/C++ library from Windev? Is Windev code as readable as Python for non-computer scientists? ... - windev as a good IDE, python? boa-constructor is ok with wxpython Python for Windows comes with an IDE (PythonWin) iirc. Otherwise there are plenty of development tools for database applications in Python (not all mentioned below are free): Access/Filemaker-like: - Rekall (Qt) - Knoda (Qt) - Kexi (Qt) - Gemello (GTK) - Glom (GTK) ... GUI-Builders: - Qt Designer - Glade (GTK) - Gazpacho (GTK) Kiwi (application framework) - wxGlade (wxwidgets) - DialogBlocks (wxWidgets) - VisualWx (wxWidgets) - wxDesigner (wxWidgets) ... IDEs: - WingIDE - Eric3 - SPE - Komodo - PyDev (for Eclipse) - Trustudio (for Eclipse) - Pythoncard (incl. GUI-Builder) - Boa Constructor (incl. GUI-Builder) ... Others: - GNUe (wxWidgets) (complete framework for enterprise database applications, including application server etc.) - TinyERP (GTK) (complete ERP implemented in Python, but if you strip out all the ERP-specific modules, you get a powerful framework inlcuding a workflow engine) - Dabo (wxWidgets) (framework GUI Builder) ... - python is open source (that's not an argument for my boss, sorry it's a boss ...) The point is that with Python you _can_ have commercial support if you want/need to. With Windev, as with any other proprietary software, you _depend_ on the original developer to continue to exist, fix bugs, implement required functionality... How anyone can bet the existence of a company on proprietary software in a time where even multi-billion dollar companys get taken over just to consolidate competition is beyond my scope of comprehension. Sincerely, Wolfgang Keller -- My email-address is correct. Do NOT remove .nospam to reply. -- http://mail.python.org/mailman/listinfo/python-list
Re: for: else: - any practical uses for the else clause?
Peter Otten [EMAIL PROTECTED] writes: all_heights = lambda: (block.height for block in stack if block.is_marked()) You still need the stop() trick to omit the heights after the marked block. Yeah, that code was based on my earlier mis-read of the original post. How's this: def blocks_until_mark(): return itertools.takewhile(lambda block:\ not block.is_marked(), \ stack) height = sum(b.height for b in blocks_until_mark()) if is_empty(blocks_until_mark()): raise SomeError(No marked block) Alternatively you can turn all_heights into a list (comprehension) which makes the test trivial. Yes, I felt it wasn't in the spirit of the thing to use that memory. I think it will be interesting to see how Python 3000's emphasis on iterators will affect overall code complexity. We will need more iterator primitives, which are still evolving. -- http://mail.python.org/mailman/listinfo/python-list
Storing records from a parsed file
Apologies if this is te wrong place to post - I realise the question is pretty basic... I have a simple python script that parses a text file and extracts data from it. Currently this data is stored in a list by a function, each element of which is an instance of a class with member variables to take the data. So for example I have: camera_list.append(camera(alpha,beta,gamma)) where class camera: def __init__(self,name,site,address,text): self.name=name self.site=site self.address=address self.text=text Every time I append an item to this list I pass in the constructor parameters so end up with all my data in the list which can then be accessed by doing myList[x].name (for example) This seemed like a nice solution until I tried to put the entire parsing program into its own class. I did this so that I could parse different types of file: thistype.getdata() thattype.getdata() ... thisfile and thatfile would have the same function definitions, but different implementations as needed. But now my list generating funtion needs to create inner camera classes when it is itself a member funcition of a class. This seems to be causing problems - I coudl possibly use nested dictionaries, but this sounds messy. Ideally I would use structs defined inside the outer class, but pythn doesn't seem to support these. I hope I haven't rambled too much here - I'm new to python so have probably done some silly things :-) Cheers, Ben -- http://mail.python.org/mailman/listinfo/python-list
Re: builtin regular expressions?
Antoine De Groote [EMAIL PROTECTED] writes:
Hello,
Can anybody tell me the reason(s) why regular expressions are not built into
Python like it is the case with Ruby and I believe Perl? Like for example in
the following Ruby code
line = 'some string'
case line
when /title=(.*)/
puts Title is #$1
when /track=(.*)/
puts Track is #$1
when /artist=(.*)/
puts Artist is #$1
end
I'm sure there are good reasons, but I just don't see them.
Python Culture says: 'Explicit is better than implicit'. May it be related to
this?
See if this isn't better to read:
def print_message(some_str):
if some_str.startswith('track='):
print Your track is, some_str[6:]
elif some_str.startswith('title='):
print It's a title of, some_str[6:]
elif some_str.startswith('artist='):
print It was played by, some_str[7:]
else:
print Oops, I dunno the pattern for this line...
return
for line in ['track=My favorite track', 'title=My favorite song',
'artist=Those Dudes', 'Something else']:
print_message(line)
Expected output:
Your track is My favorite track
It's a title of My favorite song
It was played by Those Dudes
Oops, I dunno the pattern for this line...
I came from Perl and was used to think with regular expressions for
everything. Now I rarely use them. They aren't needed to solve most of the
problems.
--
Jorge Godoy [EMAIL PROTECTED]
--
http://mail.python.org/mailman/listinfo/python-list
Typing UTF-8 characters in IDLE
Ricky, I found your message now, because I also would encounter the same problem. A few unicode tutorials on the web show that it's possible to type unicode characters into the IDLE gui... However, when i type korean (hangul) characters it complains: Unsupported Characters in input I don't have a great understanding of unicode, but when I use a UTF-8 source file with korean strings in, and run it as a CGI script it works fine. I'm using python 2.3.3 on win XP. Any tutorials / info anyone could point me to? Thanks... Now I am using Hangle with Japaese. What I did is as follow. My Python is now 2.4.3 1) open the IOBinding.py in $python/idellib 2) see the block just after line35, and insert one line. encoding = ascii # line 35 if sys.platform == 'win32': # On Windows, we could use mbcs. However, to give the user # a portable encoding name, we need to find the code page try: encoding = locale.getdefaultlocale()[1] codecs.lookup(encoding) except LookupError: pass encoding = 'utf-8' ## - this line force the encoding to utf-8. - 3) save the file and quit Idle and reopen Idle. I hope my experience will solve your problem. (It has passed 2 years and more, so you might already solve the problem. I you know better solution, please inform me.) kazuo -- http://mail.python.org/mailman/listinfo/python-list
Re: builtin regular expressions?
Antoine De Groote wrote: Hello, Can anybody tell me the reason(s) why regular expressions are not built into Python like it is the case with Ruby and I believe Perl? Like for example in the following Ruby code line = 'some string' case line when /title=(.*)/ puts Title is #$1 when /track=(.*)/ puts Track is #$1 when /artist=(.*)/ puts Artist is #$1 end I'm sure there are good reasons, but I just don't see them. Partially it's a matter of language design philosophy, and partially it's a matter of the early history of the language. Guido tends toward a very clean, almost mathematical minimalist approach: things should be put into the core language that duplicate other things. Larry Wall tends toward what I think of as a kitchen sink approach. Put it in! The other is early history. Python started out as the scripting language for an operating system research project at a university. Perl started out as a language for doing text manipulation in a working systems administration environment. There's a different issue that, I think, illustrates this very nicely: text substitution. Python uses the % operator for text substitution. I suspect that Guido doesn't like it very much, because it has recently grown a second library for text substitution, and there's a PEP for 3.0 for yet a third library. And guess what? Neither of them uses an operator. Python Culture says: 'Explicit is better than implicit'. May it be related to this? It's more there should be one, and preferably only one, obvious way to do something. John Roth Regards, antoine -- http://mail.python.org/mailman/listinfo/python-list
Python pyphone module download
Hello, I was install python pyphone,but I can't run it becose I must download module gtk.Where to I find module gtk (gtk.exe) Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: Storing records from a parsed file
Ben wrote: Apologies if this is te wrong place to post - I realise the question is pretty basic... I have a simple python script that parses a text file and extracts data from it. Currently this data is stored in a list by a function, each element of which is an instance of a class with member variables to take the data. So for example I have: camera_list.append(camera(alpha,beta,gamma)) where class camera: def __init__(self,name,site,address,text): self.name=name self.site=site self.address=address self.text=text Every time I append an item to this list I pass in the constructor parameters so end up with all my data in the list which can then be accessed by doing myList[x].name (for example) This seemed like a nice solution until I tried to put the entire parsing program into its own class. I did this so that I could parse different types of file: thistype.getdata() thattype.getdata() thisfile and thatfile would have the same function definitions, but different implementations as needed. But now my list generating funtion needs to create inner camera classes when it is itself a member funcition of a class. This seems to be causing problems - I coudl possibly use nested dictionaries, but this sounds messy. Ideally I would use structs defined inside the outer class, but pythn doesn't seem to support these. I hope I haven't rambled too much here - I'm new to python so have probably done some silly things :-) Sounds like a fairly simple problem, but just the kind to tax a beginner ... I think you are mistaken in your belief that the camera classes have to be declared inside the file-handler classes: it's quite possible to declare them independently and use them anyway. Here's a class whose method creates an instance of another class and returns it (though it could of course just as easily return a list of such objects): In [9]: class Camera1: ...: def __init__(self, p1, p2): ...: self.p1 = p1 ...: self.p2 = p2 ...: In [10]: class Camera2: : def __init__(self, p1, p2): : self.p1 = p1 : self.p2 = p2 : In [11]: class factory: : def CreateCamera(self, x): : if x == 1: : return Camera1(a, b) : else: : return Camera2(x, y) : In [12]: f = factory() In [13]: c1 = f.CreateCamera(1) In [14]: c2 = f.CreateCamera(something else) In [15]: c1 Out[15]: gs.model.Camera1 instance at 0x017E99E0 In [16]: c2 Out[16]: gs.model.Camera2 instance at 0x0180D940 Does this help? 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 -- http://mail.python.org/mailman/listinfo/python-list
Re: Storing records from a parsed file
Ah I see. So istead of creating the classes diectly I use a facroty class as a buffer - I tell it what I want and it makes the appropriate instances. I am not enitely sure that applies here though (I may be wrong) Currently I have: camera_list[] class camera: def __init__(self,alpha,beta,gamma...): self.alpha=alpha self.beta=beta self.gamma=gamma ... for (some conditions) camera_list.append(camera(alpha,beta,gamma...) the append command creates an instance of the camera class and shoves it at the end of a list for each itteration of the loop. However, I want to recover various types of information from the text file I am parsing - not just (as in the example above) camera data. However I am trying to keep the interface the same. so I can have collectSomeData.getData() as well as collectSomeOtherData.getData() In each case the getData impementation will be different to suit the required task. So something like: class camera: def __init__(self,alpha,beta,gamma...): self.alpha=alpha self.beta=beta self.gamma=gamma ... class list_type1 def createList() : for (some conditions) camera_list.append(camera(alpha,beta,gamma...) class list_type2 def createList() : for (some other conditions) camera_list.append(camera(alpha,beta,gamma...) data1=list_type1() data2=list_type2() data1.createList() data2.createList() The only change above is that I have taken the list appending loop and put it into a class of its own. However, wheras when the method list_type_2 was not in a class tings worked fine, when put into a class as above and the method attempts to create an instance of the camera class to append to its list it complains. I'm pretty sure there is a solution, and I think I will kick myself when I work it out (or have it pointed out)! Cheers, Ben -- http://mail.python.org/mailman/listinfo/python-list
cx_Freeze and Python
Hi. Does somebody used cx_Freeze, especially on Mac? I have a trouble to make *standalone* program. If I use dynamically compiled Python as it done by default, I always have an hardcoded URL inside the Python binary something like /usr/local/Python2.5/lib/libpython so after I freeze stuff and put to another machine, it fails with exactly the error: Library /usr/local/Python2.5/blah-blah/... is missing. Means, not a standalone App so far. Then I tried to build Python statically. I success editing Modules/Setup and I got fat binary with no such a path inside the VM. However, when I try to Freeze, it barks with the following: Traceback (most recent call last): File /Users/bm/cx_Freeze-3.0.3/initscripts/ConsoleKeepPath.py, line 15, in module exec code in m.__dict__ File FreezePython.py, line 7, in module import Freezer File Freezer.py, line 9, in module import zipfile File /Users/bm/Python2.5-static/lib/python2.5/zipfile.py, line 5, in module import binascii, cStringIO ImportError: dlopen(/Users/bm/Python2.5-static/lib/python2.5/lib-dynload/binascii.so, 2): Symbol not found: _PyModule_GetDict Referenced from: /Users/bm/Python2.5-static/lib/python2.5/lib-dynload/binascii.so Expected in: dynamic lookup Well, traceback usually differs - depends of what module it wants to load. If you make it ./configure --disable-shared, then it fails loading _struct.so or similar. What I am missing in the very principle? Thanks for any advice. -- http://mail.python.org/mailman/listinfo/python-list
Re: Storing records from a parsed file
Ah - I think I've sorted it out. I can now have data1.function() or data2.function() etc However, I can still call function() directly: function() which seems very odd Indeed. The only instances of function are within classes data1 and data2, and these definitions are different, so I don't see why I can get away with calling it without reference to a base class - for a start how does it know whivh one to call... will investigate :-p -- http://mail.python.org/mailman/listinfo/python-list
Re: builtin regular expressions?
Thus spoke Antoine De Groote (on 2006-09-30 11:24): Can anybody tell me the reason(s) why regular expressions are not built into Python like it is the case with Ruby and I believe Perl? Like for example in the following Ruby code I'm sure there are good reasons, but I just don't see them. Python Culture says: 'Explicit is better than implicit'. May it be related to this? I think it is exactly because the /\b(\d+)\s+\/\// together with $_ and $whatever=~/\/\/(?=\d+)/ are seen as the 'line noise' everybody talks about ;-) Regex as part of the core language expressions makes code very very hard to understand for newcomers, and because Python is ... To invoke an additional cost in using Regexes, the language simply prevents them in a lot of situations. Thats it. You have to think three times before you use them once. In the end, you solve the problem 'elsewise' because of the pain invoked ;-) Regards Mirco -- http://mail.python.org/mailman/listinfo/python-list
Re: builtin regular expressions?
Thus spoke Jorge Godoy (on 2006-09-30 14:37):
Antoine De Groote [EMAIL PROTECTED] writes:
I'm sure there are good reasons, but I just don't see them.
Python Culture says: 'Explicit is better than implicit'. May it be related to
this?
See if this isn't better to read:
def print_message(some_str):
if some_str.startswith('track='):
print Your track is, some_str[6:]
elif some_str.startswith('title='):
print It's a title of, some_str[6:]
elif some_str.startswith('artist='):
print It was played by, some_str[7:]
else:
print Oops, I dunno the pattern for this line...
return
for line in ['track=My favorite track', 'title=My favorite song',
'artist=Those Dudes', 'Something else']:
print_message(line)
I don't see the point here, this example can be
translated amost 1:1 to Perl and gets much more
readable in the end, consider:
sub print_message {
if (/^(track=)/ ){ print 'Your track is ' .substr($_, length $1).\n }
elsif(/^(title=)/ ){ print 'It\'s a title of '.substr($_, length $1).\n }
elsif(/^(artist=)/){ print 'It was played by '.substr($_, length $1).\n }
else { print Oops, I dunno the pattern for this line...\n }
}
print_message for ( 'track=My favorite track', 'title=My favorite song',
'artist=Those Dudes', 'Something else' );
Now one could argue if simple Regexes like
/^track=/ are much worse compared to
more explicit formulations, like
str.startswith('track=')
I came from Perl and was used to think with regular expressions for
everything. Now I rarely use them. They aren't needed to solve
most of the problems.
OK, I do Perl and Python side by side and didn't reach
that point so far, maybe beause I read the Friedel-Book
( http://www.oreilly.com/catalog/regex2/reviews.html )
sometimes and actually *like* the concept of regular expressions.
Regards
Mirco
--
http://mail.python.org/mailman/listinfo/python-list
Re: builtin regular expressions?
Jorge Godoy [EMAIL PROTECTED] wrote:
See if this isn't better to read:
def print_message(some_str):
if some_str.startswith('track='):
print Your track is, some_str[6:]
elif some_str.startswith('title='):
print It's a title of, some_str[6:]
elif some_str.startswith('artist='):
print It was played by, some_str[7:]
else:
print Oops, I dunno the pattern for this line...
return
for line in ['track=My favorite track', 'title=My favorite song',
'artist=Those Dudes', 'Something else']:
print_message(line)
Expected output:
Or you could make it even clearer by using a loop:
messages = [
('track=', 'Your track is'),
('title=', It's a title of),
('artist=', It was played by),
]
def print_message(s):
for key, msg in messages:
if s.startswith(key):
print msg,s[len(key):]
break
else:
print Oops, I dunno the pattern for this line...
for line in ['track=My favorite track', 'title=My favorite song',
'artist=Those Dudes', 'Something else']:
print_message(line)
--
http://mail.python.org/mailman/listinfo/python-list
Re: builtin regular expressions?
Mirco Wahab wrote: Thus spoke Antoine De Groote (on 2006-09-30 11:24): Can anybody tell me the reason(s) why regular expressions are not built into Python like it is the case with Ruby and I believe Perl? Like for example in the following Ruby code I'm sure there are good reasons, but I just don't see them. Python Culture says: 'Explicit is better than implicit'. May it be related to this? I think it is exactly because the /\b(\d+)\s+\/\// together with $_ and $whatever=~/\/\/(?=\d+)/ are seen as the 'line noise' everybody talks about ;-) Regex as part of the core language expressions makes code very very hard to understand for newcomers, and because Python is ... To invoke an additional cost in using Regexes, the language simply prevents them in a lot of situations. Thats it. You have to think three times before you use them once. In the end, you solve the problem 'elsewise' because of the pain invoked ;-) Tim Peters frequently says something along the lines of If you have a problem and you try to solve it with regexes, then you have TWO problems. This isn't because the Python use of regexes is more difficult than Perl's: it's because regexes themselves are inherently difficult when the patterns get at all sophisticated. If you think Perl gives better text-handing features nobody is going to mind if you use Perl - appropriate choice of language is a sign of maturity. Personally I tend to favour the way Python does it, but I don't require that anyone else does. The real answer to why doesn't Python do it like Perl? is Because Python's not like Perl. regards Steve -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://holdenweb.blogspot.com Recent Ramblings http://del.icio.us/steve.holden -- http://mail.python.org/mailman/listinfo/python-list
Re: builtin regular expressions?
Mirco Wahab [EMAIL PROTECTED] writes:
I don't see the point here, this example can be
translated amost 1:1 to Perl and gets much more
readable in the end, consider:
I could make it shorter in Python as well. But for a newbie that haven't seen
the docs for strings in Python I thought the terse version would be more
interesting.
At least he'll see that there are methods to do what he wants already builtin
with the language.
sub print_message {
if (/^(track=)/ ){ print 'Your track is ' .substr($_, length $1).\n }
elsif(/^(title=)/ ){ print 'It\'s a title of '.substr($_, length $1).\n }
elsif(/^(artist=)/){ print 'It was played by '.substr($_, length $1).\n }
else { print Oops, I dunno the pattern for this line...\n }
}
print_message for ( 'track=My favorite track', 'title=My favorite song',
'artist=Those Dudes', 'Something else' );
If I were writing in Perl I'd not use substr like this and would write code
similar to the one the OP posted (i.e., /^track=(.*)/).
OK, I do Perl and Python side by side and didn't reach
that point so far, maybe beause I read the Friedel-Book
( http://www.oreilly.com/catalog/regex2/reviews.html )
sometimes and actually *like* the concept of regular expressions.
I like them as well. I just don't see the need to use them everywhere. :-)
--
Jorge Godoy [EMAIL PROTECTED]
--
http://mail.python.org/mailman/listinfo/python-list
Re: builtin regular expressions?
Duncan Booth [EMAIL PROTECTED] writes: Or you could make it even clearer by using a loop: Oops. Should have read your message before replying to Mirco. But again, since the OP didn't read the docs for string operations I tried the terse approach so that he actually sees the correspondence from Perl to Python. Dictionaries (and hashes in Perl) are very powerful and solve very interesting problems (specially when one is looking for something like a case implementation in Python). -- Jorge Godoy [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: Storing records from a parsed file
Finally got it all sorted :-) I got slightly confused because it seems that if you refer to class variables from methods within that class you need to explicitly state that they are self, otherwise, since class variables are all public in python, things could get quite confusing. Ben Ben wrote: Ah - I think I've sorted it out. I can now have data1.function() or data2.function() etc However, I can still call function() directly: function() which seems very odd Indeed. The only instances of function are within classes data1 and data2, and these definitions are different, so I don't see why I can get away with calling it without reference to a base class - for a start how does it know whivh one to call... will investigate :-p -- http://mail.python.org/mailman/listinfo/python-list
_gtk
Hello, Where to I download module: _gtk -- http://mail.python.org/mailman/listinfo/python-list
Re: builtin regular expressions?
Thus spoke Jorge Godoy (on 2006-09-30 17:50):
Mirco Wahab [EMAIL PROTECTED] writes:
I could make it shorter in Python as well. But for a newbie that haven't seen
the docs for strings in Python I thought the terse version would be more
interesting.
OK
At least he'll see that there are methods to do what he wants already builtin
with the language.
OK
sub print_message {
if (/^(track=)/ ){ print 'Your track is ' .substr($_, length $1).\n
}
...
If I were writing in Perl I'd not use substr like this and would write code
similar to the one the OP posted (i.e., /^track=(.*)/).
Right, I actually tried to match your example as close as I could
get and to use only *simple* Regexes (as stated below). What one
really would do (as you probably meant above) is sth. like:
sub print_message {
if (/^track=(.+?)/ ){ print Your track is $1\n }
...
which has a more complicated regex that is usually
not understood easily by newbies.
OK, I do Perl and Python side by side and didn't reach
that point so far, maybe beause I read the Friedel-Book
( http://www.oreilly.com/catalog/regex2/reviews.html )
sometimes and actually *like* the concept of regular expressions.
I like them as well. I just don't see the need to use them everywhere. :-)
I like Python for its radically plain look, my
underlying feeling of Python is: Pascal, whereas
Perl feels and tastes like C to me ;-)
Regards
Mirco
--
http://mail.python.org/mailman/listinfo/python-list
Re: _gtk
[EMAIL PROTECTED] schrieb: Hello, Where to I download module: _gtk is google dead today? google: python module gtk download windows something like the fifth link. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: windev vs python SOS
Can Windev interface with .net? YES Can Windev interface with Java? YES Can Windev interface natively with nearly every relational database on the planet? YES Does Windev interface with JMS, Java RMI, SAP RFC, mqseries and other middleware? YES Can you easily access any C/C++ library from Windev? YES Is Windev code as readable as Python for non-computer scientists? I don't know Python but Wlangage is as readable as free text I am always amazed when I meet fanatics!! Links abour Windev for those who like facts : http://www.windev.com/pcsoft/testimonials/index.html http://www.pcsoft.fr/annonce10/photos.html http://www.pcsoft.fr/pcsoft/120pages/index.html Be cool !!! A. Wolfgang Keller wrote: - python work on multiple platform (linux, mac, windows) A good point but it didn't interest him. Because we want to choose a language for prototyping. So multi platform is not enough. With Python the prototype _is_ the application. You just need to add a little bit of polishing (exception handling etc.) where required, maybe implement a speed-critical module in Pyrex, that's it. And for running a production application, cross-platform-ness _is_ important. Or what would you do when your customer wants to run his application not just on Windows, but on an embedded OS like VxWorks, QNX, or a _real_ server OS such as any proprietary Unix (including MacOS X), Linux, *BSD, OS/400 (or whatever it is called now), MVS... Can Windev interface with .net? For Python, there's Python.net (not Ironpython, that's a different thing). Can Windev interface with Java? For Python, there's JPype (not Jython, that's a different thing as well). Does Windev interface with JMS, Java RMI, SAP RFC, mqseries and other middleware? Can you build COM clients and servers in Windev? Can you build Corba clients and servers in Windev? Can Windev interface natively with nearly every relational database on the planet? Can you easily access any C/C++ library from Windev? Is Windev code as readable as Python for non-computer scientists? ... - windev as a good IDE, python? boa-constructor is ok with wxpython Python for Windows comes with an IDE (PythonWin) iirc. Otherwise there are plenty of development tools for database applications in Python (not all mentioned below are free): Access/Filemaker-like: - Rekall (Qt) - Knoda (Qt) - Kexi (Qt) - Gemello (GTK) - Glom (GTK) ... GUI-Builders: - Qt Designer - Glade (GTK) - Gazpacho (GTK) Kiwi (application framework) - wxGlade (wxwidgets) - DialogBlocks (wxWidgets) - VisualWx (wxWidgets) - wxDesigner (wxWidgets) ... IDEs: - WingIDE - Eric3 - SPE - Komodo - PyDev (for Eclipse) - Trustudio (for Eclipse) - Pythoncard (incl. GUI-Builder) - Boa Constructor (incl. GUI-Builder) ... Others: - GNUe (wxWidgets) (complete framework for enterprise database applications, including application server etc.) - TinyERP (GTK) (complete ERP implemented in Python, but if you strip out all the ERP-specific modules, you get a powerful framework inlcuding a workflow engine) - Dabo (wxWidgets) (framework GUI Builder) ... - python is open source (that's not an argument for my boss, sorry it'sa boss ...) The point is that with Python you _can_ have commercial support if you want/need to. With Windev, as with any other proprietary software, you _depend_ on the original developer to continue to exist, fix bugs, implement required functionality... How anyone can bet the existence of a company on proprietary software in a time where even multi-billion dollar companys get taken over just to consolidate competition is beyond my scope of comprehension. Sincerely, Wolfgang Keller -- My email-address is correct. Do NOT remove .nospam to reply. -- http://mail.python.org/mailman/listinfo/python-list
Re: _gtk
[EMAIL PROTECTED] wrote: Hello, Where to I download module: _gtk I would suggest starting here: http://www.pygtk.org/downloads.html It looks like you need the PyGTK package. Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: creating a small test server on my local computer
Ant wrote: Mirco Wahab wrote: Thus spoke John Salerno (on 2006-09-29 21:13): ... My advice would be (because Apache installations on WinXP don't usually support Python (except pulling the whole thing into each CGI invocation) - download and install a VMWare Player This sounds a horribly complicated way of doing things. If you read the OP's post, it seems he is simply trying to serve straight HTML pages (but with Server Side Includes) locally for testing, rather than having to pester his operations guys to put them up on the company servers. If it's just HTML and SSI, then Apache is the easy answer on XP. The download is a simple .msi installer, and you'll just be able to drop the html files in the htdocs directory to start serving them. (http://httpd.apache.org/download.cgi) Thanks! I'll look into this. -- http://mail.python.org/mailman/listinfo/python-list
Re: Mark Lutz Python interview
Fuzzyman wrote: Mark Lutz wrote: Python author and trainer Mark Lutz will be interviewed on the radio show Tech Talk this Sunday, October 1st, at 6PM Eastern time. He'll be answering questions about Python, his books, and his Python training services. Does he always talk in the third person ? ;-) We'll have to listen to the interview to find out. :) -- http://mail.python.org/mailman/listinfo/python-list
Re: for: else: - any practical uses for the else clause?
[EMAIL PROTECTED] wrote: I'm wondering if anyone has ever found a practical use for the else branch? Say you have code that looks like this: if command.startswith(set): do_set_action(command) elif command.startswith(input): do_input_action(command) elif command.startswith(print): do_print_action() else: do_general_action() Now, during refactoring, we note that there's a lot of similarity in all those if clauses that we can exploit to simplify the code. Let's ignore the final else clause for now, since it's not similar to the if and elif clauses (it has no test). We define a mapping of prefixes to actions, and rewrite the if...elif as a for loop: command_map = ( (set,do_set_action), (input,do_input_action), (print,do_print_action) ) for keyword,action in command_map: if command.startswith(keyword): action(command) break Ok, this works great. Now let's come back to that else clause: how do we translate default case to the for loop? Well, I guess we could set some sort of flag indicating we got a match But wait! We don''t have to! We can just leave the else clause there as-is, and it'll work. The for loop here is quite literally a drop-in replacement for the if...elif...elif, even going so far as to allow the same else clause. for keyword,action in command_list: if command.startswith(keyword): action(command) break else: do_general_action() Moral of the story: there are two ways to do a linear search (or linear sequence of tests): either an unrolled sequence of if...elif...elif clauses, or a rolled up for loop with a break. Either way you do it, you can tack on an else clause for when you don't find anything. Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: does anybody earn a living programming in python?
I'll attest that we have a shortage of Python developers in the Dallas area; in the DFW Python user group (dfwpython.org) we occasionally encounter local employers who have trouble finding local Python developers who can take on new work. Most of the group members are already employed, so the standard answer to the employer is to recommend hiring experienced developers and train them in Python. Unfortunately we've seen a few cases where the employer decided to choose a different technology due to the lack of available Python talent. Hopefully this will abate as more programmers understand this problem and become attracted to Python. BTW, are some Python-specific job sites: http://www.python.org/community/jobs/ http://blog.gmane.org/gmane.comp.python.jobs http://python.jobmart.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: storing variable names in a list before they are used?
John Salerno wrote: (the variables would store whatever information is entered in the text boxes to the right of each label. I'm doing it this way so I can write a loop to construct my GUI components). Thanks very much for the responses guys. I actually tried something similar with a dictionary already, but then I discovered the obvious: I need them in a certain order! :) Here is what I want to do more specifically: I am creating a single frame (wxPython terminology for a window) and the user will be able to click a New button which will open a new tab in that frame (using the wx.Notebook class). Each time a new tab is opened, it will contain a form to fill out, with a label widget on the left (First Name:) and a text box control on the right (the underlines), like this: First Name: Last Name: Job Title: etc. etc. In wxPython, you can use sizers for layout control, and in this case the FlexGridSizer is ideal. You just assign the above widgets to it in this order: first label, first textbox, second label, second textbox, etc. Instead of manually creating these widgets and adding all of them to the sizer (and having to add or delete code later in case something changes) I wanted to use some type of for loop to do it for me. This is easy for creating and adding the labels, because I need no reference for them later. But I will need a reference for the textboxes so I can later get the data that is in them. So my original question involved finding a way to assign a variable name to the textboxes while they are being automatically created in a for loop. This seems like something that is probably done quite often and maybe I'm just not thinking of the proper idiom that is used. Thanks! -- http://mail.python.org/mailman/listinfo/python-list
Re: DAT file compilation
On Windows NTFS file systems, you can add data to a file using named streams. The extra streams aren't visible from Explorer so the average end-user won't even know they're there. Roger Jay [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] That cgi idea is really cool, but I don't have any web space to host the files. Plus the bandwidth required would be deadly. I think I'll just have to stick to the zip file idea. The problem with the read-only is that this program is aimed at a Windows audience. James Stroud wrote: Jay wrote: That's one solution, but I'd rather a file format the end-user can't easily mess around with. Require the program to be installed as root and installation to be in a read-only directory--or serve the resources to your program from a cgi script somewhere, only to be downloaded when needed. This way, the user would at least have to reverse engineer your program to see where the resources were coming from so they could plug the appropriate query in their web browser. James -- James Stroud UCLA-DOE Institute for Genomics and Proteomics Box 951570 Los Angeles, CA 90095 http://www.jamesstroud.com/ == Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News== http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- -- http://mail.python.org/mailman/listinfo/python-list
Re: MySQLdb for Python 2.5
Martin v. Löwis wrote: Harold Trammel schrieb: Does anyone know the status of a version of MySQLdb that will work with Python 2.5? AFAICT, MySQLdb 1.2.1 builds and works just fine. Does anyone know if Windows binaries for 2.5 are available somewhere? Regards, Jan -- http://mail.python.org/mailman/listinfo/python-list
PyCon 2007: What talks/tutorials/panels do you want to see?
This thread is for posting ideas and general brainstorming about what kinds of talks folks would be interested in seeing at PyCon 2007. The idea is to inspire volunteer speakers to propose talks that they might not otherwise realize would be popular, and to give PyCon organizers a whiff of fresh community feedback. So, what do you want to see? What will attract you to travel to PyCon? Or for that matter, what does your boss need to see on the schedule to allow you to expense the conference? The deadline for talks proposals is October 31. http://us.pycon.org/TX2007/CallForProposals The deadline for tutorial proposals is November 15. http://us.pycon.org/TX2007/CallForTutorials Remember, tutorials are half-day events on the day prior to the main PyCon days, and have a separate admission price. The tutorial teachers do receive some financial compensation for their time and preparation. Also, consider the possibility of panel discussions, which would compete for time with normal talks but might not require the same kind of speaker preparation or proposal. Who in the Python community would you like to see in a panel discussion or town-hall style event? Btw, there is also a wiki for consolidating ideas on talks: http://us.pycon.org/TX2007/TalkIdeas -- http://mail.python.org/mailman/listinfo/python-list
Re: Escapeism
Sybren Stuvel wrote:
Kay Schluehr enlightened us with:
Usually I struggle a short while with \ and either succeed or give up.
Today I'm in a different mood and don't give up. So here is my
question:
You have an unknown character string c such as '\n' , '\a' , '\7' etc.
How do you echo them using print?
print_str( c ) prints representation '\a' to stdout for c = '\a'
print_str( c ) prints representation '\n' for c = '\n'
...
It is required that not a beep or a linebreak shall be printed.
try print repr(c).
This yields the hexadecimal representation of the ASCII character and
does not simply echo the keystrokes '\' and 'a' for '\a' ignoring the
escape semantics. One way to achieve this naturally is by prefixing
'\a' with r where r'\a' indicates a raw string. But unfortunately
rawrification applies only to string literals and not to string
objects ( such as c ). I consider creating a table consisting of pairs
{'\0': r'\0','\1': r'\1',...} i.e. a handcrafted mapping but maybe
I've overlooked some simple function or trick that does the same for
me.
Kay
--
http://mail.python.org/mailman/listinfo/python-list
Re: builtin regular expressions?
Mirco Wahab [EMAIL PROTECTED] writes:
sub print_message {
if (/^track=(.+?)/ ){ print Your track is $1\n }
...
which has a more complicated regex that is usually
not understood easily by newbies.
Specially the non-greedy part. :-) I don't believe that non-greedyness would
be adequate here since I believe he's willing to process the whole line.
===
$line = track='My favorite track';
if ($line =~ /^track=(.+?)/) { print My track is $1\n};
===
outputs
===
My track is '
===
While
===
$line = track='My favorite track';
if ($line =~ /^track=(.+)/) { print My track is $1\n};
===
outputs
===
My track is 'My favorite track'
===
and what I'd use
===
$line = track='My favorite track';
if ($line =~ /^track=(.*)/) { print My track is $1\n};
===
has the same output. ;-)
All this running perl 5.8.8.
Be seeing you,
--
Jorge Godoy [EMAIL PROTECTED]
--
http://mail.python.org/mailman/listinfo/python-list
Re: builtin regular expressions?
Just to get it clear at the beginning, I started this thread. I'm not a
newbie (don't get me wrong, I don't see this as an insult whatsoever,
after all, you couldn't know, and I appreciate it being so nice to
newbies anyway). I'm not an expert either, but I'm quite comfortable
with the language by now. It's just that, when I started Python I loved
it for its simplicity and for the small amount of code it takes to get
something done. So the idea behind my original post was that the
Perl/Ruby way takes even less to type (for the regex topic of this
discussion, I'm not generalizing), and that I like a lot. To me (and I
may be alone) the Perl/Ruby way is more beautiful (Python culture:
Beautiful is better than ugly) than the Python way (in this particular
case) and therefore I couldn't see the reasons.
Some of you say that this regex stuff is used rarely enough so that
being verbose (and therefore more readable ?) is in these few cases the
better choice. To me this a perfectly reasonable and maybe it is just
true (as far as one can talk about true/false for something subjective
as this). I dont' know (yet) ;-)
I just have to learn accept the fact that Python is more verbose more
often than Ruby (I don't know Perl really). Don't get me wrong though, I
know the benefits of this (at least in some cases) and I can understand
that one opts for it. Hopefully I will end up some day preferring the
Python way.
Thanks for your explanations.
Regards,
antoine
Mirco Wahab wrote:
Thus spoke Jorge Godoy (on 2006-09-30 17:50):
Mirco Wahab [EMAIL PROTECTED] writes:
I could make it shorter in Python as well. But for a newbie that haven't
seen
the docs for strings in Python I thought the terse version would be more
interesting.
OK
At least he'll see that there are methods to do what he wants already builtin
with the language.
OK
sub print_message {
if (/^(track=)/ ){ print 'Your track is ' .substr($_, length
$1).\n }
...
If I were writing in Perl I'd not use substr like this and would write code
similar to the one the OP posted (i.e., /^track=(.*)/).
Right, I actually tried to match your example as close as I could
get and to use only *simple* Regexes (as stated below). What one
really would do (as you probably meant above) is sth. like:
sub print_message {
if (/^track=(.+?)/ ){ print Your track is $1\n }
...
which has a more complicated regex that is usually
not understood easily by newbies.
OK, I do Perl and Python side by side and didn't reach
that point so far, maybe beause I read the Friedel-Book
( http://www.oreilly.com/catalog/regex2/reviews.html )
sometimes and actually *like* the concept of regular expressions.
I like them as well. I just don't see the need to use them everywhere. :-)
I like Python for its radically plain look, my
underlying feeling of Python is: Pascal, whereas
Perl feels and tastes like C to me ;-)
Regards
Mirco
--
http://mail.python.org/mailman/listinfo/python-list
Re: Escapeism
Kay Schluehr [EMAIL PROTECTED] wrote:
try print repr(c).
This yields the hexadecimal representation of the ASCII character and
does not simply echo the keystrokes '\' and 'a' for '\a' ignoring the
escape semantics.
But you yourself noted earlier that '\a' and '\x07' are the same string
and said:
But lets weaken the requirement and fix a canonical representation in
case of ambiguity.
That's exactly what repr(c) does, it uses a canonical representation
with '\t', '\r', '\n', '\\', (and when it has to \', '\') using the
short escape form (because they are so commonly used), and the all the
other (more obscure) escape sequences using the hexadecimal form.
BTW, c.encode('string_escape') is another way to convert a string to almost
the same escaped form (except for a minor difference in the treatment of
quote characters).
But unfortunately rawrification applies only to string literals and
not to string objects ( such as c ).
Oh dear, the fact that you could even consider writing that sentence seems
to show a fundamental misunderstanding of what a raw string literal means.
--
http://mail.python.org/mailman/listinfo/python-list
Re: The Python world tries to be polite [formerly offensive to another language]
On Sat, 30 Sep 2006 09:10:14 +0100, Steve Holden [EMAIL PROTECTED] wrote: My God, Perl 6 is going to be even less comprehensible that Perl 5, which was at least usable. Is »=« really a Perl6 operator? That's too funny! While we poor Python people have to cope with writing: d = dict(zip(k, v)) instead of Perl 6's %h = @k = @v; But at least the Perl solution is 4 non-whitespace characters shorter... unless you don't write the source in Unicode, in which you have to put and instead of the chevrons -- that makes it only 2 characters shorter. hoping-the-chevrons-were-emphasis-on-ly y'rs - steve Nope; they turn the operator into a hyper operator that iterates over its operands. See http://dev.perl.org/perl6/doc/design/syn/S03.html#___top. Perl 6: the PL/1 of scripting languages. --amk -- http://mail.python.org/mailman/listinfo/python-list
Re: builtin regular expressions?
Antoine De Groote [EMAIL PROTECTED] writes: Just to get it clear at the beginning, I started this thread. I'm not a newbie Sorry :-) I got to this wrong conclusion because of the way I read your message. an expert either, but I'm quite comfortable with the language by now. It's just that, when I started Python I loved it for its simplicity and for the small amount of code it takes to get something done. So the idea behind my See that being small is not all that important. From the Zen of Python: Explicit is better than implicit. original post was that the Perl/Ruby way takes even less to type (for the regex topic of this discussion, I'm not generalizing), and that I like a lot. To me (and I may be alone) the Perl/Ruby way is more beautiful (Python culture: Beautiful is better than ugly) than the Python way (in this particular case) and therefore I couldn't see the reasons. You can import the re module and use regular expressions in Python, but you probably know that. Some of you say that this regex stuff is used rarely enough so that being verbose (and therefore more readable ?) is in these few cases the better choice. To me this a perfectly reasonable and maybe it is just true (as far as one can talk about true/false for something subjective as this). I dont' know (yet) ;-) It is to me. :-) If you're parsing simple structures then it might not be to you (for complex structures you'd end up with some sort of parser). I just have to learn accept the fact that Python is more verbose more often than Ruby (I don't know Perl really). Don't get me wrong though, I know the benefits of this (at least in some cases) and I can understand that one opts for it. Hopefully I will end up some day preferring the Python way. One thing that is also interesting: code completion. One editor can help you write startswith but it can't help with /^. The same goes for endswith compared to $/. I just mentioned this because in the argument of less code to write leads to less bugs doesn't mean that we have typed all what is written :-) -- Jorge Godoy [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: creating a small test server on my local computer
John Salerno wrote: Ant wrote: Mirco Wahab wrote: Thus spoke John Salerno (on 2006-09-29 21:13): ... My advice would be (because Apache installations on WinXP don't usually support Python (except pulling the whole thing into each CGI invocation) - download and install a VMWare Player This sounds a horribly complicated way of doing things. If you read the OP's post, it seems he is simply trying to serve straight HTML pages (but with Server Side Includes) locally for testing, rather than having to pester his operations guys to put them up on the company servers. If it's just HTML and SSI, then Apache is the easy answer on XP. The download is a simple .msi installer, and you'll just be able to drop the html files in the htdocs directory to start serving them. (http://httpd.apache.org/download.cgi) Thanks! I'll look into this. Yup, I'd second that as an approach. I have Apache on my XP system, with mod_python and all the trimmings. 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 -- http://mail.python.org/mailman/listinfo/python-list
loop over list and modify in place
Is looping over a list of objects and modifying (adding an attribute to) each item only possible like this? mylist = [ obj1, obj2, obj3 ] for i in xrange( len( mylist ) ): mylist[i].newattribute = 'new value' I'm guessing there is a way to do this without introducing the (in principle unnecessary) index i, so what I'm really looking for is a looping method which doesn't pass references to the values of the items but to the items themselves. -- http://mail.python.org/mailman/listinfo/python-list
Re: DAT file compilation
Roger Upole wrote: On Windows NTFS file systems, you can add data to a file using named streams. The extra streams aren't visible from Explorer so the average end-user won't even know they're there. I hadn't realised how easy it is to access alternate data streams from Python. A filename of the right form (basefile.ext:alternatename) works just fine, it appears. Unfortunately you then have the problem of how to create it, since there is no way to carry it around outside an NTFS filesystem, so some sort of post-install script would be required. There's also the issue that alternate data stream of any significant size will be regarded with great suspicion by forensic examinations and similar tests. 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 -- http://mail.python.org/mailman/listinfo/python-list
Re: Python/UNO/OpenOffice?
as others have said, that project provides a working interface to OOo (OpenOffice 2 on Ubuntu Breezy and Dapper). i've made several posts to this regard over the summer here on CLP. i was mostly using it to mess around with documents in StarWriter. cheers, -- wesley - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Core Python Programming, Prentice Hall, (c)2007,2001 http://corepython.com wesley.j.chun :: wescpy-at-gmail.com python training and technical consulting cyberweb.consulting : silicon valley, ca http://cyberwebconsulting.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Escapeism
Kay Schluehr wrote:
Sybren Stuvel wrote:
Kay Schluehr enlightened us with:
Usually I struggle a short while with \ and either succeed or give up.
Today I'm in a different mood and don't give up. So here is my
question:
You have an unknown character string c such as '\n' , '\a' , '\7' etc.
How do you echo them using print?
print_str( c ) prints representation '\a' to stdout for c = '\a'
print_str( c ) prints representation '\n' for c = '\n'
...
It is required that not a beep or a linebreak shall be printed.
try print repr(c).
This yields the hexadecimal representation of the ASCII character and
does not simply echo the keystrokes '\' and 'a' for '\a' ignoring the
escape semantics. One way to achieve this naturally is by prefixing
'\a' with r where r'\a' indicates a raw string. But unfortunately
rawrification applies only to string literals and not to string
objects ( such as c ). I consider creating a table consisting of pairs
{'\0': r'\0','\1': r'\1',...} i.e. a handcrafted mapping but maybe
I've overlooked some simple function or trick that does the same for
me.
No, you've overlooked the fact that if you print the string containing
the two characters backslash and lower case a then it will print
exactly those two characters. See:
In [30]: c = \\a
In [31]: len(c)
Out[31]: 2
In [32]: print c
\a
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
--
http://mail.python.org/mailman/listinfo/python-list
Re: loop over list and modify in place
Is looping over a list of objects and modifying (adding an attribute to) each item only possible like this? mylist = [ obj1, obj2, obj3 ] for i in xrange( len( mylist ) ): mylist[i].newattribute = 'new value' I'm guessing there is a way to do this without introducing the (in principle unnecessary) index i, so what I'm really looking for is a looping method which doesn't pass references to the values of the items but to the items themselves. Please consider the previous question as an arbitrary random brain cell fluctuation whose probability of occurence is around once per month and before sending the question it hasn't yet happened to me in September. -- http://mail.python.org/mailman/listinfo/python-list
Re: builtin regular expressions?
Jorge Godoy wrote: Antoine De Groote [EMAIL PROTECTED] writes: Just to get it clear at the beginning, I started this thread. I'm not a newbie Sorry :-) I got to this wrong conclusion because of the way I read your message. no problem ;-) maybe my formulation was a bit naive, too... an expert either, but I'm quite comfortable with the language by now. It's just that, when I started Python I loved it for its simplicity and for the small amount of code it takes to get something done. So the idea behind my See that being small is not all that important. From the Zen of Python: Explicit is better than implicit. original post was that the Perl/Ruby way takes even less to type (for the regex topic of this discussion, I'm not generalizing), and that I like a lot. To me (and I may be alone) the Perl/Ruby way is more beautiful (Python culture: Beautiful is better than ugly) than the Python way (in this particular case) and therefore I couldn't see the reasons. You can import the re module and use regular expressions in Python, but you probably know that. yes I know that ... ;-) again Some of you say that this regex stuff is used rarely enough so that being verbose (and therefore more readable ?) is in these few cases the better choice. To me this a perfectly reasonable and maybe it is just true (as far as one can talk about true/false for something subjective as this). I dont' know (yet) ;-) It is to me. :-) If you're parsing simple structures then it might not be to you (for complex structures you'd end up with some sort of parser). I just have to learn accept the fact that Python is more verbose more often than Ruby (I don't know Perl really). Don't get me wrong though, I know the benefits of this (at least in some cases) and I can understand that one opts for it. Hopefully I will end up some day preferring the Python way. One thing that is also interesting: code completion. One editor can help you write startswith but it can't help with /^. The same goes for endswith compared to $/. I just mentioned this because in the argument of less code to write leads to less bugs doesn't mean that we have typed all what is written :-) Excellent point! Love it :-) Helps me overcome it. Regards, antoine -- http://mail.python.org/mailman/listinfo/python-list
Re: DAT file compilation
Steve Holden [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Roger Upole wrote: On Windows NTFS file systems, you can add data to a file using named streams. The extra streams aren't visible from Explorer so the average end-user won't even know they're there. I hadn't realised how easy it is to access alternate data streams from Python. A filename of the right form (basefile.ext:alternatename) works just fine, it appears. Unfortunately you then have the problem of how to create it, since there is no way to carry it around outside an NTFS filesystem, so some sort of post-install script would be required. There's also the issue that alternate data stream of any significant size will be regarded with great suspicion by forensic examinations and similar tests. regards Steve -- Another drawback is that you have to be careful how you move the files around. shutil.copyfile doesn't pick up alternate streams. Also, there's no way from stock python to enumerate the streams. (but that could be a plus for the OP) Roger == Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News== http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- -- http://mail.python.org/mailman/listinfo/python-list
Re: storing variable names in a list before they are used?
John Salerno wrote: Here is what I want to do more specifically: Ok, I'm sure you all get the idea by now, but here's a simpler way to look at it: Instead of first_name = wx.TextCtrl(self) last_name = wx.TextCtrl(self) job_title = wx.TextCtrl(self) etc. and subsequently: sizer.Add(first_name) sizer.Add(last_name) sizer.Add(job_title) etc. I want to do something like this: for name in names: name = wx.TextCtrl(self) sizer.Add(name) It's just that I don't know how to handle the name variable in the names list. -- http://mail.python.org/mailman/listinfo/python-list
Re: builtin regular expressions?
Antoine De Groote wrote: Just to get it clear at the beginning, I started this thread. I'm not a newbie (don't get me wrong, I don't see this as an insult whatsoever, after all, you couldn't know, and I appreciate it being so nice to newbies anyway). I'm not an expert either, but I'm quite comfortable with the language by now. It's just that, when I started Python I loved it for its simplicity and for the small amount of code it takes to get something done. So the idea behind my original post was that the Perl/Ruby way takes even less to type (for the regex topic of this discussion, I'm not generalizing), and that I like a lot. To me (and I may be alone) the Perl/Ruby way is more beautiful (Python culture: Beautiful is better than ugly) than the Python way (in this particular case) and therefore I couldn't see the reasons. Some of you say that this regex stuff is used rarely enough so that being verbose (and therefore more readable ?) is in these few cases the better choice. To me this a perfectly reasonable and maybe it is just true (as far as one can talk about true/false for something subjective as this). I dont' know (yet) ;-) I just have to learn accept the fact that Python is more verbose more often than Ruby (I don't know Perl really). Don't get me wrong though, I know the benefits of this (at least in some cases) and I can understand that one opts for it. Hopefully I will end up some day preferring the Python way. One of the differences between the Python way and the Perl way is that the Perl way has a side-effect: Perl assigns to the variables $1, $2, etc. each time you execute a regular expression whereas Python just returns a match object for each, so it's not overwriting the results of the previous one. I find the Python way cleaner. -- http://mail.python.org/mailman/listinfo/python-list
Native MP3 Decoder?
I've been working on a simple cross-platform alarm clock application in Python. I took the time to learn wxPython for the frontend, and figured there would be some backend for decoding mp3s to play at alarm time. So far, I have found 3 viable options. 1) pyMedia, which works great, but only works on Windows XP and Linux, and not MacOSX 2) pyGame, which seems to lack the needed SDL_mixer support for pygame.music 3) wx.MediaCtrl, which supposedly works on Windows and MacOSX, but not Linux So, I began to look for a pure Python MP3 decoder. To my surprise, there was not one implementation to be found. Is Python too slow for a pure Python MP3 decoder? I would like to help in getting something like this started. Unfortunately, I have almost no knowledge of the underlying MP3 algorithm. I know that there is a MP3 decoder written in pure Java, called javazoom, which could be drawn from heavily. I have begun taking that code and porting it to Python, but what I really need is an someone who is experienced who can help me out with some of the implementation details. If anyone knows of another project like this, an alternative that I haven't found yet, or has experience in mp3 decoding, please respond with your thoughts. -- http://mail.python.org/mailman/listinfo/python-list
Re: Escapeism
Steve Holden wrote:
Kay Schluehr wrote:
Sybren Stuvel wrote:
Kay Schluehr enlightened us with:
Usually I struggle a short while with \ and either succeed or give up.
Today I'm in a different mood and don't give up. So here is my
question:
You have an unknown character string c such as '\n' , '\a' , '\7' etc.
How do you echo them using print?
print_str( c ) prints representation '\a' to stdout for c = '\a'
print_str( c ) prints representation '\n' for c = '\n'
...
It is required that not a beep or a linebreak shall be printed.
try print repr(c).
This yields the hexadecimal representation of the ASCII character and
does not simply echo the keystrokes '\' and 'a' for '\a' ignoring the
escape semantics. One way to achieve this naturally is by prefixing
'\a' with r where r'\a' indicates a raw string. But unfortunately
rawrification applies only to string literals and not to string
objects ( such as c ). I consider creating a table consisting of pairs
{'\0': r'\0','\1': r'\1',...} i.e. a handcrafted mapping but maybe
I've overlooked some simple function or trick that does the same for
me.
No, you've overlooked the fact that if you print the string containing
the two characters backslash and lower case a then it will print
exactly those two characters. See:
In [30]: c = \\a
In [31]: len(c)
Out[31]: 2
In [32]: print c
\a
I'm interested in the transition between two literals from which one is
a string literal containing \ as a meta character s.t. '\a' has
actually length 1 and is beep when printed to stdout and its raw form
without a meta character interpretation of \ that leads to the result
you described. Using the string prefix r to '\a' indicates the raw form
to the compiler. But there seems to be no runtime counterpart. I've
suggested a naive implementation such as
def rawform(c):
return {'\a': r'\a'}[c]
Here the function returns for the single input character '\a' the two
character raw form by means of escaping \ ( and raises a KeyError
exception otherwise ).
c = '\a'
print rawform(c)
\a
This has the same effect as writing:
c = r'\a'
print c
\a
But there is some ambiguity due to the the fact that applying '\7' to
rawform() yields r'\a' and not r'\7'. So one needs more specification
for disambiguation using e.g. an extra parameter.
--
http://mail.python.org/mailman/listinfo/python-list
Re: builtin regular expressions?
* Steve Holden (Sat, 30 Sep 2006 17:46:03 +0100) Mirco Wahab wrote: Thus spoke Antoine De Groote (on 2006-09-30 11:24): Tim Peters frequently says something along the lines of If you have a problem and you try to solve it with regexes, then you have TWO problems. It's originally from Jamie Zawinski: 'Some people, when confronted with a problem, think I know, I'll use regular expressions. Now they have two problems.' And the simple reason why Regular Expressions are not a part of the core Python language is that Regular Expressions are overrated. They are simply not the preferred tool for every kind of text manipulation and extraction. Thorsten -- http://mail.python.org/mailman/listinfo/python-list
Re: for: else: - any practical uses for the else clause?
How do you transform this? height = 0 for block in stack: if block.is_marked(): print Lowest marked block is at height, height break height += block.height else: raise SomeError(No marked block) def get_height_of_first_marked_bock(stack): height = 0 for block in stack: if block.is_marked(): return height height += block.height raise SomeError(No marked block) height = get_height_of_first_marked_block(stack) print Lowest marked block is at height, height Yes, this transformation is one line longer, but the control flow is much easier to understand. In general, using the for/else clause mixes the retrieval and the usage of the element. Consider this: for item in list: if somecond(item): A) do something with item break else: B) exceptional code when somecond() doesnt match anything in list The code that you write in the positions A and B really are misplaced. They arent part of the iteration of list. The two tasks, find item and do something with item should be separated. def find_item(list): for item in list: if somecond(item): return item return None # OR raise an exception item = find_item(list) if item: A) do something with item else: B) exceptional code This is, IMHO, much better style. -- mvh Björn -- http://mail.python.org/mailman/listinfo/python-list
Re: builtin regular expressions?
Thus spoke Jorge Godoy (on 2006-09-30 19:04):
Mirco Wahab [EMAIL PROTECTED] writes:
sub print_message {
if (/^track=(.+?)/ ){ print Your track is $1\n }
...
Specially the non-greedy part. :-) I don't believe that non-greedyness would
be adequate here since I believe he's willing to process the whole line.
Ohh, but I think it really is, my intention was
to get the quotet text out of the quotes, if
there is any, eg.:
sub print_message {
if (/^track=(.+?)/ ){ print Your track is $1\n }
...
}
print_message for 'track=My favorite track', 'title=My favorite song',
'artist=Those Dudes', 'Something else' ;
(... our quoting chars are just inverted.)
$line = track='My favorite track';
if ($line =~ /^track=(.+?)/) { print My track is $1\n};
outputs
My track is '
Of course, you can't have the nongreedy thing
without a following item, in the case mentioned,
a second \ (which would have been consumed
in the 'greedy' mode).
and what I'd use
$line = track='My favorite track';
if ($line =~ /^track=(.*)/) { print My track is $1\n};
OK, but to pull the quoted text alone, you'd
need the non-greedy thing, as in
...
if ( /^track='(.+?)'/ ){ print Your track is $1\n }
...
Alternatively, you could use the negated character class
for that:
if ( /^track='([^']+)/ ){ print Your track is $1\n }
which has exactly the same character count (so taste matters here) ...
Regards
Mirco
--
http://mail.python.org/mailman/listinfo/python-list
Re: Mark Lutz Python interview
Fuzzyman wrote: Mark Lutz wrote: Python author and trainer Mark Lutz will be interviewed on the radio show Tech Talk this Sunday, October 1st, at 6PM Eastern time. He'll be answering questions about Python, his books, and his Python training services. Does he always talk in the third person ? ;-) Yes, I've heard that he does. :-) -- http://mail.python.org/mailman/listinfo/python-list
Re: loop over list and modify in place
Daniel Nogradi wrote: Is looping over a list of objects and modifying (adding an attribute to) each item only possible like this? mylist = [ obj1, obj2, obj3 ] for i in xrange( len( mylist ) ): mylist[i].newattribute = 'new value' I'm guessing there is a way to do this without introducing the (in principle unnecessary) index i, so what I'm really looking for is a looping method which doesn't pass references to the values of the items but to the items themselves. You can use map, or if you don't map, like list comprehension: py class B(object): ... def __repr__(self): ... return 'B: %s' % self.value ... def __init__(self): ... self.value = None ... py alist = [B() for i in xrange(5)] py alist [B: None, B: None, B: None, B: None, B: None] py [setattr(b,'value',v+5) for (v,b) in enumerate(alist)] [None, None, None, None, None] py alist [B: 5, B: 6, B: 7, B: 8, B: 9] py map(setattr, alist, ['value']*5, xrange(5)) [None, None, None, None, None] py alist [B: 0, B: 1, B: 2, B: 3, B: 4] -- James Stroud UCLA-DOE Institute for Genomics and Proteomics Box 951570 Los Angeles, CA 90095 http://www.jamesstroud.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Typing UTF-8 characters in IDLE
thanks, it is useful. but ,why this line encoding = locale.getdefaultlocale()[1] in original fileIOBinding.py , don't work? it should be work kazuo fujimoto wrote: Ricky, I found your message now, because I also would encounter the same problem. A few unicode tutorials on the web show that it's possible to type unicode characters into the IDLE gui... However, when i type korean (hangul) characters it complains: Unsupported Characters in input I don't have a great understanding of unicode, but when I use a UTF-8 source file with korean strings in, and run it as a CGI script it works fine. I'm using python 2.3.3 on win XP. Any tutorials / info anyone could point me to? Thanks... Now I am using Hangle with Japaese. What I did is as follow. My Python is now 2.4.3 1) open the IOBinding.py in $python/idellib 2) see the block just after line35, and insert one line. encoding = ascii # line 35 if sys.platform == 'win32': # On Windows, we could use mbcs. However, to give the user # a portable encoding name, we need to find the code page try: encoding = locale.getdefaultlocale()[1] codecs.lookup(encoding) except LookupError: pass encoding = 'utf-8' ## - this line force the encoding to utf-8. - 3) save the file and quit Idle and reopen Idle. I hope my experience will solve your problem. (It has passed 2 years and more, so you might already solve the problem. I you know better solution, please inform me.) kazuo -- http://mail.python.org/mailman/listinfo/python-list
Re: Native MP3 Decoder?
[EMAIL PROTECTED] wrote: If anyone knows of another project like this, an alternative that I haven't found yet, or has experience in mp3 decoding, please respond with your thoughts. There's pymad ( http://spacepants.org/src/pymad/ ); haven't tried but it should work everywhere libmad does. Regards, Jordan -- http://mail.python.org/mailman/listinfo/python-list
