Re: str(int_var) formatted
Il Fri, 29 Oct 2010 19:18:41 -0700, John Yeung ha scritto: > On Oct 29, 11:59 am, Tracubik wrote: >> i've to convert integer x to string, but if x < 10, the string have to >> be '0x' instead of simple 'x' >> >> for example: >> >> x = 9 >> str(x) --> '09' > > Everyone else seems to prefer the format-based solutions, which is fine. > I will give zfill a little exposure, as it seems unloved/ underused: > > str(x).zfill(2) > > John I've also used zfill in my code, it make code more readable imo. Thanks to all for their kind help Nico -- http://mail.python.org/mailman/listinfo/python-list
Re: functions, list, default parameters
On Sat, 30 Oct 2010 19:31:53 +1300, Gregory Ewing wrote: > Steven D'Aprano wrote: > >> And how does Python know whether some arbitrary default object is >> mutable or not? > > It doesn't, that's the whole point. I think we're in violent agreement :) -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: embarrassing class question
On Sat, 30 Oct 2010 19:30:21 +1300, Gregory Ewing wrote: > (BTW, there are no function names that have a special meaning in a > module dict -- a module is not like a class.) Pity... it would be nice to have a __main__() function, or perhaps main(), that was automatically called when you call the module like a script. There are, however, a few special module attributes -- they just aren't functions. __doc__, __name__, __file__ and __package__ come to mind. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: multiprocessing signal defect
On Oct 29, 10:08 am, Adam Tauno Williams wrote: > No, I don't think so. You're asking the module to over generalize > behavior. Reaping of the child is important, and that the child needs > to be reaped may matter to the master child (why? did something go > wrong?). And such information is made available when you reap the child process. There are a ton of ways for the module to provide sane and proper default behavior and still provide hooks for people who need to modify the behavior or retrieve information. However, I can't imagine a use case where the end-developer cares about the process' exit status from a multiprocess.Pool. > Silently reaping them [which would reduce the size of the > Pool? Or would it dynamically create a new worker?] might have > unintended side effects. Such as? Personally, even if you do enumerate one, I'm not sure how much it matters, as an unintended side effect has already occurred. It's too late to avoid side effects, they've already happened. Moreover, merely blithely continuing on invites all sorts of fun side effects, like the lovely "undefined behavior" side effect. > How would a 'traditional' thread pool behave if a thread abended? [of > course, that depends on the thread-pool implementation] The correct > behavior in case of an exception in a thread is a topic of some debate. Yes, but we're not talking about an exception in a thread, we're talking about a thread being terminated by the OS. Which should be treated like every other OS termination: as a fatal error. There's not way for the multiprocessing module to fully recover from such an event to a known state, so the only sensible thing left is termination. Anything else runs the risk of undefined behavior. Adam -- http://mail.python.org/mailman/listinfo/python-list
Using PHP to Dynamically Compress CSS and JavaScript ...
Using PHP to Dynamically Compress CSS and JavaScript ... CSS and JavaScript files are simple plain text files with large amounts of unused space. Compressing all your style sheets into one page ... read more > http://childschooledu.blogspot.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Python changes
On 10/28/2010 2:14 PM, Craig McRoberts wrote: > First off, greetings from a newbie! > > Here's the deal. I gained a passable knowledge of Python nearly ten > years ago. Then I decided a career in the computer sciences wasn't > for me, and I let it go. Now I find myself back in the development > arena, and I'd like to pick up Python again. How much has it changed > in my ten years' absence? I've already resigned myself to starting > over from the beginning, but are my books from that time period even > worth using now? > > Thanks so much. > Welcome back. You will find that Python 2.7 retains just about everything you already know. Python 3.x would have some surprises, but 2.7 is currently the best-supported all-purpose install. regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 PyCon 2011 Atlanta March 9-17 http://us.pycon.org/ See Python Video! http://python.mirocommunity.org/ Holden Web LLC http://www.holdenweb.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: How on Factorial
On 27 Okt., 10:27, Arnaud Delobelle wrote:
> True. It's far too verbose. I'd go for something like:
>
> f=lambda n:n<=0 or n*f(~-n)
>
> I've saved a few precious keystrokes and used the very handy ~- idiom!
You can replace "n<=0" with "n<1". Then you can leave out the space
before "or" ("0or" wouldn't work with newer python versions).
f=lambda n:n<1or n*f(~-n)
Much better, isn't it? ;-)
--
http://mail.python.org/mailman/listinfo/python-list
[ANN] Pyspread 0.1.2 released
Pyspread 0.1.2 released === I am pleased to announce the new release 0.1.2 of pyspread. About: -- Pyspread is a cross-platform Python spreadsheet application. It is based on and written in the programming language Python. Instead of spreadsheet formulas, Python expressions are entered into the spreadsheet cells. Each expression returns a Python object that can be accessed from other cells. These objects can represent anything including lists or matrices. Pyspread runs on Linux and *nix platforms with GTK support as well as on Windows (XP and Vista tested). On Mac OS X, some icons are too small but the application basically works. Homepage http://pyspread.sourceforge.net Changes to 0.1.1 New features: * Added function to make a cell visible * Third cell justification "center" added * Ctrl-F now points to find toolbar instead of find dialog * Frozen state is now saved * Entering text in a cell now deletes old text * Added function F5 (in menu View) for refreshing selected cells * Save option "pys file with/without gpg signature" added Bug fixes: * Grid flicker reduced * Printing works again * Changing the table now empties the entry line and does not mess up data any more (BUG 3030172) * 1D printing bug fixed (BUG 2790444) * Loading a file from command line no longer deletes cell 0,0,0 (BUG 3030880) * Undoing paste operations now works (BUG 3019334) * Bitmap toggle buttons now work in Windows as well * Marks undo and redo operation do not accumulate any more * Undoing text font and textattribute changes works now * CSV import dialog apply button removed * Cell limit (2**26) for 32 bit systems removed * Prints of off-screen areas now correctly center on page * Help now works when not in the home directory * Double underscores in Tutorial corrected * Pyspread gpg key name changed to pyspread_ * Deleting rows and columns can be undone again * When reversing search, all values are now found * Saved pys files now have .pys suffix added automatically * Fixed font size reset bug when setting font attributes * Loading a file from command line now checks signature correctly * Fixed moving cells bug for edits in non top-left grid position in wx.GTK Enjoy Martin -- http://mail.python.org/mailman/listinfo/python-list
Tkinter Scrollbar bad behavior [re. bug #10232]
I am trying to use Tkinter to create a custom scrollable widget, similar to a list box but with 3 Entry fields per row. In the real application each Entry has a separate input validation routine. I have placed a test case file in the bug I reported: http://bugs.python.org/issue10232 The most serious issue is the behavior on MS Windows. In my sample program the scroll bar slider has a problem. When slowly moved down it works for the first few rows but fails near the bottom of travel. Near the bottom it rapidly generates "moveto" commands that jump between rows 4 and 7, causing the display to flash until button 1 is released. This behavior does not occur on Linux -- there scrolling using the slider is smooth top to bottom. Terry Reedy confirmed this behavior still exists in Python 3 (I tested in 2.7 on Windows and 2.6.2 on Linux. He suggested I post here as there may be someone more familiar with Tkinter who could shed some light. Thanks in advance. -- http://mail.python.org/mailman/listinfo/python-list
Re: [OFF] sed equivalent of something easy in python
Jussi Piitulainen writes: > Daniel Fetchinson writes: > > > The pattern is that the first line is deleted, then 2 lines are > > kept, 3 lines are deleted, 2 lines are kept, 3 lines are deleted, > > etc, etc. > > So, is there some simple expression in Python for this? (item for i, item in enumerate(input) if (i + 4)%5 < 2) -- [mdw] -- http://mail.python.org/mailman/listinfo/python-list
Re: Generating PDF file in Python
On Saturday 30 October 2010 04:27, Lawrence D'Oliveiro wrote: > In message , Ed Keith > wrote: > >> I need to generate PDF files and I'm exploring what tools to use. I was >> planing on using ReportLab, but recently found some references to pango >> (http://www.pango.org/) and ciaro (http://cairographics.org/) being able >> to generate PDF files. But am having difficulty finding details. [...] >> Are there other options I have overlooked? > > How about Poppler? Poppler is first and foremost a rendering library, not a PDF generator, though it's very good at what it does: http://poppler.freedesktop.org/ David -- http://mail.python.org/mailman/listinfo/python-list
Re: curses and processing terminal escape characters
On 2010-10-30, Lawrence D'Oliveiro wrote: > In message , Tim Harig wrote: > >> Python could easily process the escape codes for any given terminal; but, >> in general, you would want something that works for more then a single >> terminal type. > > Does anyone still bother with anything other than VT1xx-type terminals? 1. Actually, most modern terminals and emulators have color which means that they must by in the VT2xx range or above. 2. Yes there are still hardware terminals being used and not all of them are VTxxxs. 3. Even assuming that the OP is only conserned about VTxxx terminals, it is still a better coding practice to use a layer of abstraction so as to keep the "magic numbers" out of his code. 4. Just because VTxxx style terminals and emulators currently dominate doesn't mean that they will do so forever. It is quite possible that in an age where most terminals are emulated, that somebody will create a new style of terminal that fits in better to the virtual/graphical world in which they inhabit. 5. Although it is offtopic for this question, using the curses abstraction rather then hardcoded values, allows a visual text based program to work in places that do not act like a traditional terminal. Microsoft Windows console fits this description because formating commands are not sent in-band with the text data. By using something like PDCurses, it is possible to run curses programs on non-terminal environments such as these. -- http://mail.python.org/mailman/listinfo/python-list
Re: curses and processing terminal escape characters
On 10/29/2010 9:48 PM Lawrence D'Oliveiro said... In message, Tim Harig wrote: Python could easily process the escape codes for any given terminal; but, in general, you would want something that works for more then a single terminal type. Does anyone still bother with anything other than VT1xx-type terminals? I'm still supporting about 150 green screen user seats (CHUIs), and no, they're all running vt100 emulators. Done-with-termcap-hacking-ly y'rs, Emile -- http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter Scrollbar bad behavior [re. bug #10232]
Robert, First and foremost if you wish to scroll a window then why not use the TIX.ScrolledWindow widget instead. It even shows and hides the scrollbar when necessary. #-- Start Script --# from Tix import * #from Tkconstants import * class App(Tk): # Must use Tk for Tix incompability def __init__(self): Tk.__init__(self) self._createWidgets() def _createWidgets(self): swin = ScrolledWindow(self, width=400, height=300) swin.pack(fill=BOTH, expand=1) frame = swin.window col, row = 0,0 for row in range(100): for col in range(3): w=Button(frame, text='This is button (%02d, %02d)' % (col, row)) w.grid(row=row, column=col) col += 1 row += 1 if __name__ == '__main__': app = App() app.mainloop() #-- End Script --# -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 2.7 or 3.1
In message , Christian Heimes wrote: > Am 29.10.2010 23:16, schrieb Lawrence D'Oliveiro: > >> In message , Jorge >> Biquez wrote: >> >>> I was wondering if you can comment more about what alternatives to >>> use instead to MySql. My web solutions do not need "all the power" of >>> a true database, >> >> Is more than one process likely to access the data at the same time? If >> so, use MySQL. > > You have to store and acces a LOT of data? Hadoop may the solution. I don’t think the OP is quite at the level where they need to think in terms of something as heavy-hitting as that. I suggested MySQL because that’s the usual thing people start with for a multiuser situation, unless/until they decide they need something more. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 2.7 or 3.1
I agree +1 Sent wirelessly from my BlackBerry. -Original Message- From: Lawrence D'Oliveiro Sender: python-list-bounces+bradenf=hotmail@python.org Date: Sun, 31 Oct 2010 13:30:38 To: Subject: Re: Python 2.7 or 3.1 In message , Christian Heimes wrote: > Am 29.10.2010 23:16, schrieb Lawrence D'Oliveiro: > >> In message , Jorge >> Biquez wrote: >> >>> I was wondering if you can comment more about what alternatives to >>> use instead to MySql. My web solutions do not need "all the power" of >>> a true database, >> >> Is more than one process likely to access the data at the same time? If >> so, use MySQL. > > You have to store and acces a LOT of data? Hadoop may the solution. I don’t think the OP is quite at the level where they need to think in terms of something as heavy-hitting as that. I suggested MySQL because that’s the usual thing people start with for a multiuser situation, unless/until they decide they need something more. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: factorial of negative one (-1)
On 2010-10-30 00:29 , Bj Raz wrote: Thank you Robert for the clarification. Since I'm an amateur programmer, could you please give me a sample of how I would do it. Chris Rebert just showed you. I'll take some time to study arrays as well, and how to write them, I know of lists, and tuples, and dictionaries; from "Dive into Python". but I am very green around the ears still. :| You don't need anything other than lists here. -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco -- http://mail.python.org/mailman/listinfo/python-list
How to write pbm file in Python 3?
I'm trying to create pbm (portable bitmap) files using Python 3 and have run into a problem. The example I am using is the Python 2 Mandelbrot program found at http://shootout.alioth.debian.org/u32/program.php?test=mandelbrot&lang=python&id=1 When I run it using Python 2 with size=100, I get a file of size 1311 bytes. This file contains the correct image. When I run it using Python 3 with the same parameter (and replacing xrange by range - the only change suggested by 2to3), I get a file of size 1812 bytes; this file does not contain the right image. Any help would be much appreciated. André -- http://mail.python.org/mailman/listinfo/python-list
Re: How to write pbm file in Python 3?
Sorry for the newb question but, what would this be for? Just out of curiousuty Thanks --Original Message-- From: André Sender: python-list-bounces+bradenf=hotmail@python.org To: Python List Subject: How to write pbm file in Python 3? Sent: Oct 30, 2010 11:32 PM I'm trying to create pbm (portable bitmap) files using Python 3 and have run into a problem. The example I am using is the Python 2 Mandelbrot program found at http://shootout.alioth.debian.org/u32/program.php?test=mandelbrot&lang=python&id=1 When I run it using Python 2 with size=100, I get a file of size 1311 bytes. This file contains the correct image. When I run it using Python 3 with the same parameter (and replacing xrange by range - the only change suggested by 2to3), I get a file of size 1812 bytes; this file does not contain the right image. Any help would be much appreciated. André -- http://mail.python.org/mailman/listinfo/python-list Sent wirelessly from my BlackBerry. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to write pbm file in Python 3?
On Sat, Oct 30, 2010 at 8:32 PM, André wrote: > I'm trying to create pbm (portable bitmap) files using Python 3 and > have run into a problem. The example I am using is the Python 2 > Mandelbrot program found at > http://shootout.alioth.debian.org/u32/program.php?test=mandelbrot&lang=python&id=1 > > When I run it using Python 2 with size=100, I get a file of size 1311 > bytes. This file contains the correct image. > > When I run it using Python 3 with the same parameter (and replacing > xrange by range - the only change suggested by 2to3), I get a file of > size 1812 bytes; this file does not contain the right image. > > Any help would be much appreciated. Have you tried changing all instances of chr() to bytes([]) ? In Python 3, chr() always returns Unicode rather than a bytestring; I suspect this might be the cause of your problem. If my suggestion fixes things, then arguably 2to3 ought to have warned about chr() and thus you should report this as a bug. Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: How to write pbm file in Python 3?
On Oct 31, 1:11 am, Chris Rebert wrote: > On Sat, Oct 30, 2010 at 8:32 PM, André wrote: > > I'm trying to create pbm (portable bitmap) files using Python 3 and > > have run into a problem. The example I am using is the Python 2 > > Mandelbrot program found at > >http://shootout.alioth.debian.org/u32/program.php?test=mandelbrot&lan... > > > When I run it using Python 2 with size=100, I get a file of size 1311 > > bytes. This file contains the correct image. > > > When I run it using Python 3 with the same parameter (and replacing > > xrange by range - the only change suggested by 2to3), I get a file of > > size 1812 bytes; this file does not contain the right image. > > > Any help would be much appreciated. > > Have you tried changing all instances of chr() to > bytes([]) ? Yes, I had. And I got the following traceback: Traceback (most recent call last): File "mandel_orig.py", line 39, in main() File "mandel_orig.py", line 30, in main cout(bytes([byte_acc])) TypeError: must be str, not bytes André > In Python 3, chr() always returns Unicode rather than a bytestring; I > suspect this might be the cause of your problem. > > If my suggestion fixes things, then arguably 2to3 ought to have warned > about chr() and thus you should report this as a bug. > > Cheers, > Chris > --http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: How to write pbm file in Python 3?
On Sat, Oct 30, 2010 at 9:21 PM, André wrote: > On Oct 31, 1:11 am, Chris Rebert wrote: >> On Sat, Oct 30, 2010 at 8:32 PM, André wrote: >> > I'm trying to create pbm (portable bitmap) files using Python 3 and >> > have run into a problem. The example I am using is the Python 2 >> > Mandelbrot program found at >> >http://shootout.alioth.debian.org/u32/program.php?test=mandelbrot&lan... >> >> > When I run it using Python 2 with size=100, I get a file of size 1311 >> > bytes. This file contains the correct image. >> >> > When I run it using Python 3 with the same parameter (and replacing >> > xrange by range - the only change suggested by 2to3), I get a file of >> > size 1812 bytes; this file does not contain the right image. >> >> > Any help would be much appreciated. >> >> Have you tried changing all instances of chr() to >> bytes([]) ? > Yes, I had. And I got the following traceback: > > Traceback (most recent call last): > File "mandel_orig.py", line 39, in > main() > File "mandel_orig.py", line 30, in main > cout(bytes([byte_acc])) > TypeError: must be str, not bytes Ah, right. This is the problem of not having Python 3 to test with. Try also changing: cout = sys.stdout.buffer.write Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: How to write pbm file in Python 3?
On Sun, Oct 31, 2010 at 1:32 AM, Chris Rebert wrote: > On Sat, Oct 30, 2010 at 9:21 PM, André wrote: > > On Oct 31, 1:11 am, Chris Rebert wrote: > >> On Sat, Oct 30, 2010 at 8:32 PM, André wrote: > >> > I'm trying to create pbm (portable bitmap) files using Python 3 and > >> > have run into a problem. The example I am using is the Python 2 > >> > Mandelbrot program found at > >> >http://shootout.alioth.debian.org/u32/program.php?test=mandelbrot&lan. > .. > >> > >> > When I run it using Python 2 with size=100, I get a file of size 1311 > >> > bytes. This file contains the correct image. > >> > >> > When I run it using Python 3 with the same parameter (and replacing > >> > xrange by range - the only change suggested by 2to3), I get a file of > >> > size 1812 bytes; this file does not contain the right image. > >> > >> > Any help would be much appreciated. > >> > >> Have you tried changing all instances of chr() to > >> bytes([]) ? > > Yes, I had. And I got the following traceback: > > > > Traceback (most recent call last): > > File "mandel_orig.py", line 39, in > >main() > > File "mandel_orig.py", line 30, in main > >cout(bytes([byte_acc])) > > TypeError: must be str, not bytes > > Ah, right. This is the problem of not having Python 3 to test with. > Try also changing: > cout = sys.stdout.buffer.write > Yes, that worked. Thanks! Now I know what to look for, time to read the documentation for sys.stdout.buffer ... Thanks again. André > > Cheers, > Chris > -- > http://blog.rebertia.com > -- http://mail.python.org/mailman/listinfo/python-list
Is there a way to pring a list object in Python?
class Rep(db.Model): author = db.UserProperty() replist = db.ListProperty(str) unique = db.ListProperty(str) date = db.DateTimeProperty(auto_now_add=True) Rep().replist = L Rep().put() mylist = Rep().all().fetch(10) I am trying to display mylist; but I am getting the object. Thanks. -- http://mail.python.org/mailman/listinfo/python-list
