Python training in Florida, January 19-21
Don't miss your chance to attend our upcoming Florida Python training class next month. This 3-day public class is being held January 19-21, in Sarasota, Florida. It is open to both individual and group enrollments. For more details on the class, as well as registration instructions, please visit the class web page: http://home.earthlink.net/~python-training/2010-public-classes.html If you are unable to attend in January, our next Sarasota class is already scheduled for April 6-8. Thanks, and we hope to see you at a Python class in sunny and warm Florida soon. --Mark Lutz at Python Training Services -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Bazaar 2.0.3 and 2.1.0b4 released!
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 The Bazaar team is happy to announce availability of a new releases of the bzr adaptive version control system. Bazaar is part of the GNU system http://gnu.org/. The third release of Bazaar 2.0 (2.0.3) has a small handful of bugfixes. As expected, this has no internal or external compatibility changes versus 2.0.2 (or 2.0.0). The fourth beta release in the 2.1 series brings with it a significant number of bugfixes (~20). The test suite is once again (finally) green on Windows, and should remain that way for future releases. There are a few performance related updates (faster upgrade and log), and several UI tweaks. There has also been a significant number of tweaks to the runtime documentation. 2.1.0b4 include everything from the 2.0.3 release. It is expected that the next release in the 2.1 series will be 2.1.0rc1, which means it will then enter into its stable bugfix-only phase (and 2.2.0b1 will be opened for development.) Thanks to everyone who contributed patches, suggestions, and feedback. Both the source and platform specific binaries can be downloaded from https://launchpad.net/bzr/2.0/2.0.3 https://launchpad.net/bzr/2.1/2.1.0b4 As always, all releases are available from https://launchpad.net/bzr/+download John =:- The full changelog for 2.1.0b4 and 2.0.3 follows: bzr 2.1.0b4 ### :Codename: san francisco airport :2.1.0b4: 2009-12-14 The fourth beta release in the 2.1 series brings with it a significant number of bugfixes (~20). The test suite is once again (finally) green on Windows, and should remain that way for future releases. There are a few performance related updates (faster upgrade and log), and several UI tweaks. There has also been a significant number of tweaks to the runtime documentation. 2.1.0b4 include everything from the 2.0.3 release. Compatibility Breaks * The BZR_SSH environmental variable may now be set to the path of a secure shell client. If currently set to the value ``ssh`` it will now guess the vendor of the program with that name, to restore the old behaviour that indicated the SSH Corporation client use ``sshcorp`` instead as the magic string. (Martin gzl...@googlemail.com, #176292) New Features * ``bzr commit`` now has a ``--commit-time`` option. (Alexander Sack, #459276) * ``-Dhpss`` now increases logging done when run on the bzr server, similarly to how it works on the client. (John Arbash Meinel) * New option ``bzr unshelve --keep`` applies the changes and leaves them on the shelf. (Martin Pool, Oscar Fuentes, #492091) * The ``BZR_COLUMNS`` envrionment variable can be set to force bzr to respect a given terminal width. This can be useful when output is redirected or in obscure cases where the default value is not appropriate. Pagers can use it to get a better control of the line lengths. (Vincent Ladeuil) Bug Fixes * * After renaming a file, the dirstate could accidentally reference ``source\\path`` rather than ``source/path`` on Windows. This might be a source of some dirstate-related failures. (John Arbash Meinel) * ``bzr commit`` now detects commit messages that looks like file names and issues a warning. (Gioele Barabucci, #73073) * ``bzr ignore /`` no longer causes an IndexError. (Gorder Tyler, #456036) * ``bzr log -n0 -rN`` should not return revisions beyond its merged revisions. (#325618, #484109, Marius Kruger) * ``bzr merge --weave`` and ``--lca`` will now create ``.BASE`` files for files with conflicts (similar to ``--merge3``). The contents of the file is a synthesis of all bases used for the merge. (John Arbash Meinel, #40412) * ``bzr mv --quiet`` really is quiet now. (Gordon Tyler, #271790) * ``bzr serve`` is more clear about the risk of supplying --allow-writes. (Robert Collins, #84659) * ``bzr serve --quiet`` really is quiet now. (Gordon Tyler, #252834) * Fix bug with redirected URLs over authenticated HTTP. (Glen Mailer, Neil Martinsen-Burrell, Vincent Ladeuil, #395714) * Interactive merge doesn't leave branch locks behind. (Aaron Bentley) * Lots of bugfixes for the test suite on Windows. We should once again have a test suite with no failures on Windows. (John Arbash Meinel) * ``osutils.terminal_width()`` obeys the BZR_COLUMNS environment variable but returns None if the terminal is not a tty (when output is redirected for example). Also fixes its usage under OSes that doesn't provide termios.TIOCGWINSZ. Make sure the corresponding tests runs on windows too. (Joke de Buhr, Vincent Ladeuil, #353370, #62539) (John Arbash Meinel, Vincent Ladeuil, #492561) * Terminate ssh subprocesses when no references to them remain, fixing subprocess and file descriptor leaks. (Andrew Bennetts, #426662) * The ``--hardlink`` option of ``bzr branch`` and ``bzr checkout`` now works for 2a format trees. Only files unaffected by content filters will be hardlinked.
Multiple python installations on opensuse?
Hi all, I use the finite element package ABAQUS that is partly built around python 2.4.3. ABAQUS ships with its own version of python 2.4.3 but it comes without third party libraries, e.g. numpy and scipy. In order to load these modules into ABAQUS python I must install python 2.4.3. on my opensuse laptop. How can I do this without interference with my python 2.6 installation that I use for all my non-ABAQUS python work? Best regards, Johan -- http://mail.python.org/mailman/listinfo/python-list
Re: pyZui - anyone know about this?
/home/fetchinson/pyzui/pyzui/tilestore.py:22: DeprecationWarning: the sha module is deprecated; use the hashlib module instead import sha Yeah, I'd noticed that. It's fixed in the repository now. On Dec 16, 10:55 pm, Daniel Fetchinson fetchin...@googlemail.com wrote: PyZUI 0.1 has been released: http://da.vidr.cc/projects/pyzui/ Cool, thanks very much! I'm using python 2.6 these days and noticed that you use the sha module which makes py2.6 spit out a deprecation warning: /home/fetchinson/pyzui/pyzui/tilestore.py:22: DeprecationWarning: the sha module is deprecated; use the hashlib module instead import sha It's no big deal but if you want to be future proof maybe you can switch to hashlib for py2.6 and stay with sha for py2.5 and before (a try/except block would suffice). Cheers, Daniel -- Psss, psss, put it down! -http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: pyZui - anyone know about this?
Personally I see a merging of normal app windows and a zui: some kind of new window manager. Have you seen Eagle Mode[1]? [1] http://eaglemode.sourceforge.net/ On Dec 17, 5:14 pm, Donn donn.in...@gmail.com wrote: On Wednesday 16 December 2009 07:03:19 David Roberts wrote: It involves scaling an image to various resolutions, and partitioning them into fixed-size tiles. It's roughly the same technique used by Google Maps/Earth. Thanks. That gives me something to go on. Wikipedia didn't like my search terms. ZUIs are useful for particular types of data - images mapping especially - but I'd hate to have to navigate my desktop using its approach. Ever since Corel Draw in the 90's zoomed into my life I have been in love with the idea of an endless canvas that makes me feel like a satellite on a bungee cord. I think it would fit the desktop very well. Personally I see a merging of normal app windows and a zui: some kind of new window manager. If I planned it out it would look something like this: Your apps all run as they do now*, but they live on this endless plain. Perhaps it can be divided up into 'zones' or 'galaxies' or something. I would have a 'hyperspace' or 'hyperlink' or 'jump' facility (like alt-tab, I guess) to make transits from one custom-defined area to another quick. I would have a home position for the view -- like Inkscape does in terms of show all, zoom to selected, zoom to last, etc. I would have rules about traversing. Things like file-managers need some kind of static display - like the bread crumbs and up, back, home etc. Each app would only be active when 'locked-in', beyond that it's a bitmap of the last paint. You could drag apps around when you zoom out, and you can resize them at any time too. (Just imagine OOCalc in a zui! Super/Capslock and mouse wheel for scroll/pan) The other cool idea I had was to (handwavium here) graphically convey the notion of pipes and import/export between apps. Also between any nodes across the Universe of the zui. Perhaps a special 'node view' that overlays and shows all the conduits between them -- sharp where your mouse is, faded away from that so the whole thing is not too complex. Imagine the flow from Inkscape to Gimp and back. Instead of File - Export and then File - Import, you connect pipes along the side of each app. Inkscape, [save selected as png (properties preset)] goes to Gimp [import to layers by names (a script perhaps)] Now as you work in Inkscape and hit a hotkey, all your selected vectors are sent to Gimp which reacts as if you were there and places the new pngs into layers. This can work both ways and between multiple programs. Mix-in Blender and Scribus and Lyx and some grep and a loop or two and some imagemagick... Ah, I better stop. I can ramble on sometimes :) *I have many issues with the endless variety of re-invented wheels afa gui toolkits go. This is another whole can of shai-Hulud... I wrote some stuff about this a while back, if anyone wants to be put to sleep:http://otherwise.relics.co.za/wiki/Particles/DreamDesignApp/ :) \d -- \/\/ave: donn.in...@googlewave.com home:http://otherwise.relics.co.za/ 2D vector animation :https://savannah.nongnu.org/projects/things/ Font manager :https://savannah.nongnu.org/projects/fontypython/ -- http://mail.python.org/mailman/listinfo/python-list
Re: pyZui - anyone know about this?
On Thursday 17 December 2009 10:54:59 David Roberts wrote: Have you seen Eagle Mode[1]? Yes. It's a strange beast. Good start I think; but addicted to zooming, to the detriment of the managing aspects I think. Still, here I sit writing no code and pontificating! \d -- \/\/ave: donn.in...@googlewave.com home: http://otherwise.relics.co.za/ 2D vector animation : https://savannah.nongnu.org/projects/things/ Font manager : https://savannah.nongnu.org/projects/fontypython/ -- http://mail.python.org/mailman/listinfo/python-list
ftplib timeout in Python 2.4
Hi there, The ftplib has a timeout parameter in Python 2.6 and above. Is there a way to set a timeout in Python 2.4? Regards Nico -- http://mail.python.org/mailman/listinfo/python-list
Re: webscrapping ringcentral.com using mechanize
On Thu, Dec 17, 2009 at 3:34 AM, shrini tshriniva...@gmail.com wrote: Hi, I am trying to scrap the website 'http://service.ringcentral.com' It has a form with three input boxes. When trying to get the form with mechanize, it is throwing the following error. mechanize._mechanize.FormNotFoundError: no form matching name 'login' but, the page has the form with name login. This form is submitted by javascript. Though i am not sure,i think posting values via urllib could help . Also you may find it useful, http://stackoverflow.com/questions/1806238/mechanize-python-click-a-button -- Regards, S.Selvam -- http://mail.python.org/mailman/listinfo/python-list
Re: Object Relational Mappers are evil (a meditation)
On 2009-12-16, J Kenneth King ja...@agentultra.com wrote: The language doesn't encourage anything. It's just a medium like oil paints and canvas. A painting can be good or bad despite the medium it is constructed on. The skill of the painter is what matters. Technically, oil paints do encourage a certain kind of painting. They can be layered on top of old paint easily, and they dry slowly, allowing you to slowly build up a painting in layers, and create effects with texture. If you try doing thse things with watercolors, and you'll probably be discouraged. I think a programming language does encourage a certain kind of code. Good code in one language can be poor in another. -- Neil Cerutti -- http://mail.python.org/mailman/listinfo/python-list
Re: csv reader
As csv.reader does not suport utf-8 encoded files, I'm using:
fp = codecs.open(arquivoCSV, r, utf-8)
self.tab=[]
for l in fp:
l=l.replace('\','').strip()
self.tab.append(l.split(','))
It works much better except that when I do self.sel.type(q, ustring)
where ustring is a unicode string obtained from the file using the
code showed above.
Remaining problem is that I obtain sp insted of a regular space...
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Re: parallelpython 1.5.7 crash
Thanks Zeph. -- http://mail.python.org/mailman/listinfo/python-list
accessing gmail
I'm having trouble getting to gmail messages. I can access my googlemail
account through imap with no problems, that's an old one. The problem is
trying to get to my current gmail account, which is actually
t...@tonyburrows.com. The page shows up as
mail.google.com/a/tonyburrows.com and I can't see how to get at it.
mail = imaplib.IMAP4_SSL('imap.gmail.com, 993)
mail.login(username, password)
logs me in to my googlemail account and lets me collect mail in that one,
but how do I get to the gmail one?
Tony
--
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Re: accessing gmail
Intchanter / Daniel Fackrell wrote: http://mail.google.com/support/bin/answer.py?hl=enanswer=77654 Thanks! Actually I had a sudden inspiration last night as I went to bed. I'd set up Thunderbird, all I needed to do was use the same full h...@domain as the username. Stupid, stupid - I'd wasted so much time and it was so simple. I will remember it though. Now to figure out the rest of it. Tony -- http://mail.python.org/mailman/listinfo/python-list
Python Goldmine has been updated: http://preciseinfo.org/Convert/index_Convert_Python.html
Python Goldmine has been updated as of dec 15 2009. http://preciseinfo.org/Convert/index_Convert_Python.html Mirrors: http://pythongoldmine.vndv.com. -- http://mail.python.org/mailman/listinfo/python-list
Re: More stuff added to ch 2 of my programming intro
In article 183af5d2-e157-4cd6-bec6-8997809e1...@d21g2000yqn.googlegroups.com, Mensanator mensana...@aol.com wrote: Oh, I don't know, maybe because I'm thinking about buying one and seeing 2.3, 2.4 and 2.5 directories on the model in the store made me wary. That's odd since, AFAIK, Apple has never released an OS X with Python 2.4. Current Apple systems ship with OS X 10.6, aka Snow Leopard. 10.6 includes a Python 2.6.1 (64-bit/32-bit) and a Python 2.5.4 (32-bit only). The previous release, 10.5, shipped with 2.5 and 2.3. But, not to worry, if you need other versions, you can download OS X installers from python.org. http://www.python.org/download/releases/3.1.1/http://www.python.org/ftp/pyth on/3.1.1/python-3.1.1.dmg This tells me nothing. That's the disk image for the OS X Python 3.1.1 installer. Official binary installers for OS X are provided on python.org for every final Python release. or (for MacPorts fans): $ sudo port install python31 And since I haven't got one, this also tells me nothing. http://www.macports.org/ The MacPorts Project is an open-source community initiative to design an easy-to-use system for compiling, installing, and upgrading either command-line, X11 or Aqua based open-source software on the Mac OS X operating system. -- Ned Deily, n...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
Re: Multiple python installations on opensuse?
2009/12/17 Johan Ekh ekh.jo...@gmail.com: Hi all, I use the finite element package ABAQUS that is partly built around python 2.4.3. ABAQUS ships with its own version of python 2.4.3 but it comes without third party libraries, e.g. numpy and scipy. In order to load these modules into ABAQUS python I must install python 2.4.3. on my opensuse laptop. How can I do this without interference with my python 2.6 installation that I use for all my non-ABAQUS python work? Go to python.org, and download appropriate source (shjould be one for 2.4 final release). $ mkdir $HOME/my2.4build/ $ ./configure --prefix=$HOME/my2.4build make make install; To run- $ cd $HOME/my2.4build/bin $ ./python I am assuming you've got the C/C++ libraries installed. -- Regards, Ishwor Gurung -- http://mail.python.org/mailman/listinfo/python-list
Fwd: Multiple python installations on opensuse?
Scipy needs various libraries. On Ubuntu (which I use) -
Depends: python ( 2.7), python (= 2.5), python-central (= 0.6.11),
python-numpy (= 1:1.2.0), libblas3gf | libblas.so.3gf |
libatlas3gf-base, libc6 (= 2.4), libgcc1 (= 1:4.1.1), libgfortran3
(= 4.3), liblapack3gf | liblapack.so.3gf | libatlas3gf-base,
libstdc++6 (= 4.1.1), libsuitesparse-3.2.0 (= 1:3.2.0)
So, doing a source/binary install similarly and then install Scipy again.
-- Forwarded message --
From: Johan Ekh ekh.jo...@gmail.com
Date: 2009/12/17
Subject: Re: Multiple python installations on opensuse?
To: Ishwor Gurung ishwor.gur...@gmail.com
Thanks guys,
I installed it as root without the --prefix option using make
altinstall instead of make install.
It worked and I can now execute python2.4.6 with python2.4 while
python2.6 is still executed
with python.
I also managed to install numpy with python2.4 setup.py install.
However, installing scipy
in the same way failed with the error below. Most of my libraries
appears to be in /usr/lib64/
or /usr/local/lib64 and the install script can't find them because it
searched /usr/lib/ and /usr/local/lib/.
How can I fix this?
Sorry for newbiesh questions...
//Johan
== Output from python2.4 setup.py install
Warning: No configuration returned, assuming unavailable.
blas_opt_info:
blas_mkl_info:
libraries mkl,vml,guide not found in /usr/local/lib
libraries mkl,vml,guide not found in /usr/lib
NOT AVAILABLE
atlas_blas_threads_info:
Setting PTATLAS=ATLAS
libraries ptf77blas,ptcblas,atlas not found in /usr/local/lib
libraries ptf77blas,ptcblas,atlas not found in /usr/lib
NOT AVAILABLE
atlas_blas_info:
libraries f77blas,cblas,atlas not found in /usr/local/lib
libraries f77blas,cblas,atlas not found in /usr/lib
NOT AVAILABLE
/usr/local/lib/python2.4/site-packages/numpy/distutils/system_info.py:1340:
UserWarning:
Atlas (http://math-atlas.sourceforge.net/) libraries not found.
Directories to search for the libraries can be specified in the
numpy/distutils/site.cfg file (section [atlas]) or by setting
the ATLAS environment variable.
warnings.warn(AtlasNotFoundError.__doc__)
blas_info:
libraries blas not found in /usr/local/lib
libraries blas not found in /usr/lib
NOT AVAILABLE
/usr/local/lib/python2.4/site-packages/numpy/distutils/system_info.py:1349:
UserWarning:
Blas (http://www.netlib.org/blas/) libraries not found.
Directories to search for the libraries can be specified in the
numpy/distutils/site.cfg file (section [blas]) or by setting
the BLAS environment variable.
warnings.warn(BlasNotFoundError.__doc__)
blas_src_info:
NOT AVAILABLE
/usr/local/lib/python2.4/site-packages/numpy/distutils/system_info.py:1352:
UserWarning:
Blas (http://www.netlib.org/blas/) sources not found.
Directories to search for the sources can be specified in the
numpy/distutils/site.cfg file (section [blas_src]) or by setting
the BLAS_SRC environment variable.
warnings.warn(BlasSrcNotFoundError.__doc__)
Traceback (most recent call last):
File setup.py, line 92, in ?
setup_package()
File setup.py, line 84, in setup_package
configuration=configuration )
File /usr/local/lib/python2.4/site-packages/numpy/distutils/core.py,
line 150, in setup
config = configuration()
File setup.py, line 54, in configuration
config.add_subpackage('scipy')
File /usr/local/lib/python2.4/site-packages/numpy/distutils/misc_util.py,
line 851, in add_subpackage
caller_level = 2)
File /usr/local/lib/python2.4/site-packages/numpy/distutils/misc_util.py,
line 834, in get_subpackage
caller_level = caller_level + 1)
File /usr/local/lib/python2.4/site-packages/numpy/distutils/misc_util.py,
line 781, in _get_configuration_from_setup_py
config = setup_module.configuration(*args)
File scipy/setup.py, line 8, in configuration
config.add_subpackage('integrate')
File /usr/local/lib/python2.4/site-packages/numpy/distutils/misc_util.py,
line 851, in add_subpackage
caller_level = 2)
File /usr/local/lib/python2.4/site-packages/numpy/distutils/misc_util.py,
line 834, in get_subpackage
caller_level = caller_level + 1)
File /usr/local/lib/python2.4/site-packages/numpy/distutils/misc_util.py,
line 781, in _get_configuration_from_setup_py
config = setup_module.configuration(*args)
File scipy/integrate/setup.py, line 10, in configuration
blas_opt = get_info('blas_opt',notfound_action=2)
File /usr/local/lib/python2.4/site-packages/numpy/distutils/system_info.py,
line 267, in get_info
return cl().get_info(notfound_action)
File /usr/local/lib/python2.4/site-packages/numpy/distutils/system_info.py,
line 416, in get_info
raise self.notfounderror,self.notfounderror.__doc__
numpy.distutils.system_info.BlasNotFoundError:
Blas (http://www.netlib.org/blas/) libraries not found.
Directories to search for the libraries can be specified in the
Re: (OT) Where Are Cookies Stored?
On 12/17/2009 2:33 AM, Dave Angel wrote:
Victor Subervi wrote:
On Tue, Dec 15, 2009 at 6:57 PM, r0g aioe@technicalbloke.com wrote:
snip
Cookies in FF for Windows are stored in an sqlite database in here...
~\Application Data\Mozilla\Firefox\Profiles\%XYZ%\firefox_profile\
Man, I searched C drive (the only drive) on this computer where I'm
working
(Internet cafe) for Application Data and nuttin.
V
How are you searching? Microsoft is so sure we don't want to see the
gory details that they hide all sorts of things, by default. And
especially on a public computer, you shouldn't even look with Explorer.
As for searching with Explorer, there are not only design problems, but
bugs as well. Get a command line, and do something like:
snip
Or, you can just open Internet Explorer, type at the address bar
www.google.com; then wait for a few seconds. After the page loads,
type windows {VERSION} application data where you substitute {VERSION}
with the windows version you're using. Press I'm feeling lucky and
skim the page for something that looks like pathnames.
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Re: Help with parsing a list
On Dec 17, 4:23 am, thunderf...@gmail.com thunderf...@gmail.com
wrote:
not as slick as Emile's (didn't think about using strip() ), but
seemingly functional:
data = ['key1: data1','key2: data2','key3: data3',' key4: ','
\tdata4.1',' \tdata4.2',' \tdata4.3','key5: data5']
result = {}
for item in data:
if item.endswith(': '):
currkey = item[:-2]
result[currkey] = []
elif item.startswith(' \t'):
result[currkey].append(item[2:])
else:
key, val = item.split(': ')
result[key] = val
print 'data = %s' % data
print 'result = %s' % result
data = ['key1: data1', 'key2: data2', 'key3: data3', ' key4: ', '
\tdata4.1', ' \tdata4.2', ' \tdata4.3', 'key5: data5']
result = {'key3': 'data3', 'key2': 'data2', 'key1': 'data1', 'key5':
'data5', ' key4': ['data4.1', 'data4.2', 'data4.3']}
Hi i tried with thunderfoot code
error:
Traceback (most recent call last):
File stdin, line 8, in ?
ValueError: need more than 1 value to unpack
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Re: PIL: problem to convert an image array to PIL format
Hi, On Thu, Dec 17, 2009 at 1:14 PM, Sverre sverreodeg...@gmail.com wrote: After converting a PIL image in memory to an array with numpy.asarray (), I make a adthreshold() with pymorph() with the result, that all pixels in the array are either false or true (boolean). But my try to convert this back into PIL format is failing img = Image.fromarray(rawimg, '1') because a true will be interpreted as integer 1 ), so that 7 pixels are black and one white. Has someone a solution, so that a picture inly with true values doesn't look like this? http://img707.imageshack.us/img707/6051/p012.jpg I am not 100% sure this is what you want, but this is how I apply a simple threshold to a picture: threshold = 145 img = Image.open(gray.jpg) arr = numpy.asarray(img) filtered = arr * (arr threshold) new_img = Image.fromarray(filtered,L) Cheers, Robert -- http://mail.python.org/mailman/listinfo/python-list
file.close() does not really close under Windows?
Is it correct that low-level file handles are not being closed after doing fd = open(filepath) fd.close() If so, what is the rationale? This seems to result in system errors when trying to (re-)move or reopen closed files, as well as when opening (and closing) too many files under Windows. A workaround seems to be os_fd = os.open(filepath) fd = os.fdopen(os_fd) os.close(os_fd) -- http://mail.python.org/mailman/listinfo/python-list
Re: ftplib timeout in Python 2.4
Nico Grubert wrote: Hi there, The ftplib has a timeout parameter in Python 2.6 and above. Is there a way to set a timeout in Python 2.4? Regards Nico I don't know of one so you may need a workaround. What platforms do you need to support? Roger. -- http://mail.python.org/mailman/listinfo/python-list
When to use mechanize and Windmill library during WebScraping ?
-- Forwarded message -- From: Javier Collado javier.coll...@gmail.com To: Raji Seetharaman sraji...@gmail.com Date: Sat, 12 Dec 2009 12:52:27 +0100 Subject: Re: When to use mechanize and Windmill library during WebScraping ? Hello, If a script that uses mechanize fails to find an html node that has been identified with Firebug, this is probably because that node has been autogenerated (provided that the expression to get the node is correct). As an alternative to verify this, you can try to download the html page and open it in your favourite editor. If some of the nodes that you can see in your browser are missing or empty, then one of the JavaScript scripts in the page should have created/populated it. If you're in doubt, you can try to use mechanize and, if you have problems such as the described above, then you can move to windmill or some other tool that executes JavaScript code before trying to get the desired data. Best regards, Javier Thanks for your help Raji. S -- http://mail.python.org/mailman/listinfo/python-list
When to use mechanize and Windmill library during WebScraping ?
Be sure to look at Scrapy too: http://scrapy.org Thank U Raji. S -- http://mail.python.org/mailman/listinfo/python-list
Re: pyZui - anyone know about this?
/home/fetchinson/pyzui/pyzui/tilestore.py:22: DeprecationWarning: the sha module is deprecated; use the hashlib module instead import sha Yeah, I'd noticed that. It's fixed in the repository now. Great, thanks, pulled it and all looks good. Cheers, Daniel PyZUI 0.1 has been released: http://da.vidr.cc/projects/pyzui/ Cool, thanks very much! I'm using python 2.6 these days and noticed that you use the sha module which makes py2.6 spit out a deprecation warning: /home/fetchinson/pyzui/pyzui/tilestore.py:22: DeprecationWarning: the sha module is deprecated; use the hashlib module instead import sha It's no big deal but if you want to be future proof maybe you can switch to hashlib for py2.6 and stay with sha for py2.5 and before (a try/except block would suffice). Cheers, Daniel -- Psss, psss, put it down! -http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Multiple python installations on opensuse?
2009/12/17 Johan Ekh ekh.jo...@gmail.com: But I have them installed already! I have scipy installed under python 2.6 and everything runs perfect. ok It is only under python 2.4 that the install script can not find the libraries. I need to tell the script to lookin /usr/lib64 instead /usr/lib, how can I do this? As root, tell linker to look for libraries in /usr/lib64: $ echo /usr/lib64 /etc/ld.so.conf $ ldconfig $ ./configure Please send email to the mailing list. I am subscribed to it : [...] -- Regards, Ishwor Gurung -- http://mail.python.org/mailman/listinfo/python-list
Re: file.close() does not really close under Windows?
Dani wrote:
Is it correct that low-level file handles are not being closed after
doing
fd = open(filepath)
fd.close()
no, you are not correct.
Demonstration:
Cmd window #1:
c:\temp echo hello world x.txt
Cmd window #2
c:\temp python
Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit
(Intel)] on win32
Type help, copyright, credits or license for more
information.
f = file('x.txt')
f.close()
# remaining in an open python session
back to Cmd window #1
C:\temp del x.txt
C:\temp rem note...no error here.
C:\temp exit
back to Cmd window #2
# quit python
^Z
C:\temp exit
If so, what is the rationale?
it's not because there is no good rationale for wanting that
behavior :) The above was performed on XP (SP2 SP3) with no
issues. I can't guarantee that MS hasn't borked something in
Vista or Win7, but if they did, that's *their* issue, not Python's.
This seems to result in system errors when trying to (re-)move or
reopen closed files, as well as when opening (and closing) too many
files under Windows.
As always, check your own code/environment before assuming the
problem is with Python. In all likelihood, you had the file open
in another window/process and didn't remember. Perhaps some
background indexing process happened to hold the file open for a
brief spell?
-tkc
--
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Re: ftplib timeout in Python 2.4
I don't know of one so you may need a workaround. What platforms do you need to support? Suse Linux Enterprise 10, 64 Bit with Python 2.4.4. I need the Python 2.4.4 for a running application Server (Zope). -- http://mail.python.org/mailman/listinfo/python-list
Re: PIL: problem to convert an image array to PIL format
Sverre wrote: After converting a PIL image in memory to an array with numpy.asarray (), I make a adthreshold() with pymorph() with the result, that all pixels in the array are either false or true (boolean). But my try to convert this back into PIL format is failing img = Image.fromarray(rawimg, '1') because a true will be interpreted as integer 1 ), so that 7 pixels are black and one white. Has someone a solution, so that a picture inly with true values doesn't look like this? http://img707.imageshack.us/img707/6051/p012.jpg This has come up before, see http://mail.python.org/pipermail/python-list/2009-October/1221578.html Image.fromarray() expects one bit per pixel but actually gets one byte. One possible workaround: introduce an intermediate array with a format understood by fromarray(): import numpy from PIL import Image rawimg = numpy.zeros((20, 20), bool) rawimg[:10, :10] = rawimg[10:, 10:] = True b = numpy.array(rawimg, numpy.uint8) b *= 255 Image.fromarray(b).save(tmp.jpg) Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: file.close() does not really close under Windows?
No, it is incorrect. I tested that exact snippet here and it correctly closes the file. I can move the file around just after that. Yes, indeed. Sorry for not getting my facts straight and thank you for testing. Part of the code *was* holding a low-level file handle. -- http://mail.python.org/mailman/listinfo/python-list
Re: Raw string substitution problem
En Wed, 16 Dec 2009 11:09:32 -0300, Ed Keith e_...@yahoo.com escribió:
I am having a problem when substituting a raw string. When I do the
following:
re.sub('abc', r'a\nb\nc', '123abcdefg')
I get
123a
b
cdefg
what I want is
r'123a\nb\ncdefg'
On 12/16/2009 9:35 AM, Gabriel Genellina wrote:
From http://docs.python.org/library/re.html#re.sub
re.sub(pattern, repl, string[, count])
...repl can be a string or a function; if
it is a string, any backslash escapes in
it are processed. That is, \n is converted
to a single newline character, \r is
converted to a linefeed, and so forth.
So you'll have to double your backslashes:
I'm not persuaded that the docs are clear. Consider:
'ab\\ncd' == r'ab\ncd'
True
Naturally enough. So I think the right answer is:
1. this is a documentation bug (i.e., the documentation
fails to specify unexpected behavior for raw strings), or
2. this is a bug (i.e., raw strings are not handled correctly
when used as replacements)
I vote for 2.
Peter's use of a function highlights just how odd this is:
getting the raw string via a function produces a different
result than providing it directly. If this is really the
way things ought to be, I'd appreciate a clear explanation
of why.
Alan Isaac
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Which version of MSVC?90.DLL's to distribute with Python 2.6 based Py2exe executables?
Does anyone have any recommendations on which version of the MSVC?90.DLL's need to be distributed with a Python 2.6.4 PY2EXE (0.6.9) based executable? (I assume I need just a matching pair of MSVCR90.DLL and MSVCP90.DLL?) My understanding is that I need to match the version of the DLL's that my version of Python 2.6.4 was compiled against? On my Windows 7 Professional (64-bit) workstation, I have the following sets of MSVC?9.DLL files to choose from. Directory of C:\Program Files\Sony\VAIO Care 07/14/2009 01:18 PM 245,248 msvcm90.dll 07/14/2009 01:18 PM 851,456 msvcp90.dll 07/14/2009 01:18 PM 627,200 msvcr90.dll 3 File(s) 1,723,904 bytes Directory of C:\Program Files\Sony\VAIO Care\plugins\Microsoft.VC90.CRT 07/14/2009 01:18 PM 245,248 msvcm90.dll 07/14/2009 01:18 PM 851,456 msvcp90.dll 07/14/2009 01:18 PM 627,200 msvcr90.dll 3 File(s) 1,723,904 bytes Directory of C:\Program Files (x86)\Sony\VAIOData Restore Tool 11/26/2008 10:26 AM 568,832 msvcp90.dll 11/26/2008 08:57 AM 655,872 msvcr90.dll 2 File(s) 1,224,704 bytes Directory of C:\Program Files (x86)\Sony\VAIO Recovery\plugins 07/15/2009 05:21 PM 224,768 msvcm90.dll 07/15/2009 05:21 PM 568,832 msvcp90.dll 07/15/2009 05:21 PM 655,872 msvcr90.dll 3 File(s) 1,449,472 bytes Directory of C:\Program Files (x86)\Sony\VAIO Recovery\plugins\x64 07/15/2009 05:21 PM 627,200 msvcr90.dll 1 File(s)627,200 bytes Directory of C:\Program Files (x86)\Sony\VAIO VP Utilities 04/02/2009 07:12 PM 568,832 msvcp90.dll 04/02/2009 07:12 PM 655,872 msvcr90.dll 2 File(s) 1,224,704 bytes Directory of C:\Windows\winsxs\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.2 1022.8_none_750b37ff97f4f68b 09/04/2009 04:35 AM 245,248 msvcm90.dll 09/04/2009 04:35 AM 851,456 msvcp90.dll 09/04/2009 04:35 AM 627,200 msvcr90.dll 3 File(s) 1,723,904 bytes Directory of C:\Windows\winsxs\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.3 0729.4926_none_08e1a05ba83fe554 06/10/2009 03:31 PM 245,760 msvcm90.dll 06/10/2009 03:31 PM 853,328 msvcp90.dll 06/10/2009 03:31 PM 623,440 msvcr90.dll 3 File(s) 1,722,528 bytes Directory of C:\Windows\winsxs\x86_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.210 22.8_none_bcb86ed6ac711f91 09/04/2009 04:35 AM 224,768 msvcm90.dll 09/04/2009 04:35 AM 568,832 msvcp90.dll 09/04/2009 04:35 AM 655,872 msvcr90.dll 3 File(s) 1,449,472 bytes Directory of C:\Windows\winsxs\x86_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.307 29.1_none_e163563597edeada 09/04/2009 04:19 AM 225,280 msvcm90.dll 09/04/2009 04:19 AM 572,928 msvcp90.dll 09/04/2009 04:19 AM 655,872 msvcr90.dll 3 File(s) 1,454,080 bytes Directory of C:\Windows\winsxs\x86_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.307 29.4926_none_508ed732bcbc0e5a 06/10/2009 04:14 PM 225,280 msvcm90.dll 06/10/2009 04:14 PM 569,664 msvcp90.dll 06/10/2009 04:14 PM 652,608 msvcr90.dll 3 File(s) 1,447,552 bytes Thank you, Malcolm -- http://mail.python.org/mailman/listinfo/python-list
Re: Where is PyMethod_GET_CLASS in Python 3?
Le Tue, 15 Dec 2009 08:08:01 -0800, Infinity77 a écrit : When building C extensions In Python 2.X, there was a magical PyMethod_GET_CLASS implemented like this: #define PyMethod_GET_CLASS(meth) \ (((PyMethodObject *)meth) - im_class) It looks like Python 3 has wiped out the im_class attribute. Which is the alternative was to handle this case in Python 3? First, is it a bound method? Unbound methods are just function objects in py3k. Check that PyMethod_Check() returns true. Second, have you tried Py_TYPE(PyMethod_GET_SELF(meth))? BTW, it's very, very, *very* hard to find any possible reference to help migrating existing C extensions from Python 2.X to Python 3. There's http://docs.python.org/3.1/howto/cporting.html You are encouraged to post any suggestions or corrections on the bug tracker: http://bugs.python.org Finally, there's also a dedicated mailing-list for porting to py3k: http://mail.python.org/mailman/listinfo/python-porting While it hasn't seen a lot of activity lately, I'm sure there are people there willing to answer any questions you have! Regards Antoine. -- http://mail.python.org/mailman/listinfo/python-list
Re: More stuff added to ch 2 of my programming intro
On Thu, Dec 17, 2009 at 5:33 AM, Ned Deily n...@acm.org wrote: or (for MacPorts fans): $ sudo port install python31 And since I haven't got one, this also tells me nothing. http://www.macports.org/ The MacPorts Project is an open-source community initiative to design an easy-to-use system for compiling, installing, and upgrading either command-line, X11 or Aqua based open-source software on the Mac OS X operating system. Description sans marketing fluff: It's a Mac package manager. It's basically the same as Gentoo's portage if you've ever used that. It downloads source tarballs and patches and then compiles them locally. There are built-in lists of variants, basically sets of configure args, to compile each package. -- http://mail.python.org/mailman/listinfo/python-list
Re: Raw string substitution problem
Alan G Isaac alan.is...@gmail.com wrote in message
news:qemdnrut0jvj1lfwnz2dnuvz_vqdn...@rcn.net...
Naturally enough. So I think the right answer is:
1. this is a documentation bug (i.e., the documentation
fails to specify unexpected behavior for raw strings), or
2. this is a bug (i.e., raw strings are not handled correctly
when used as replacements)
neo There is no raw string. /neo
A raw string is not a distinct type from an ordinary string
in the same way byte strings and Unicode strings are. It
is a merely a notation for constants, like writing integers
in hexadecimal.
(r'\n', u'a', 0x16)
('\\n', u'a', 22)
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Re: frames in toplevel Tkinter
On Dec 16, 11:09 pm, J Wolfe vorticitywo...@gmail.com wrote: Probably a stupid question, but can you have a frames in a toplevel widget? Anything I try to put in a frame goes back to the main or root widget and not the toplevel or pop-up widget. Thanks for the help! Jonathan Thank you John, from Tkinter import * root = Tk() Label(root, text='This is the root window').pack() top = Toplevel(root) fr = Frame(top) # frame child of Toplevel called top fr.pack() Label(fr, text='This is in a frame in the Toplevel window').pack() root.mainloop() I swear I tried that about 20 times yesterday...and it kept putting it in my main window. Perhaps I had a naming issue. Thanks! Jonathan -- http://mail.python.org/mailman/listinfo/python-list
Re: Using Python to Execute a C or FORTRAN Program (Windows)
sturlamolden wrote: On 17 Des, 03:41, W. eWatson wolftra...@invalid.com wrote: His program was originally written in Python, but a new hardware device (capture card) had no good interface with Python, so he wrote it in C++, which does. From my knowledge of the Python program before the entry of c++, it seems he could have farmed out the hardware interface in much the same way he had done it before with a capture card well know to him. This sounds a bit incompetent. Why didn't he just write an extension module in C++? Also, if you don't know how to spawn a subprocess, I'd question your competence as well. I can't read his mind. -- http://mail.python.org/mailman/listinfo/python-list
Re: Either IDLE Can't Start a subprocess or a firewall software firewall is blocking the connection (Win)--Battlin McAfee
Alf P. Steinbach wrote: * W. eWatson: See Subject msg from Python 2.5 Win XP. It is preceded by a Socket Error. It happened while I had a simple program displayed, and I wanted to see the shell. The msg occurred when I pressed Shell on Run from the menu. I played around for awhile, but got nowhere. Same msg. I did remove my McAfee firewall protection, and it worked once, but reverted to not working. I rebooted and the first time I could use Shell, it succeeded. After that it failed. Comments? Geeze! Mcaffe turned on the firewall again after the reboot. All seems well now. Nope. McAfee turned the firewall back on. It decided to warn me it was off, but now has allowed me to ignore the fact it is no longer protecting me. I'll just let Win firewall do that, thank you. Nope it's back. I'll just stop here and let anyone who wants to just chime in. If I get it to stop, I'll be back. I recall vaguely some similar problem caused by a program attempting to connect to localhost, and the solution then was to edit the hosts file (don't ask me for details, but perhaps that'll help you search: that problem had entirely to do with Windows' very over-zealous security measures). Cheers hth., - Alf As it turns out, I can sneak around it, so I'm putting it aside. -- http://mail.python.org/mailman/listinfo/python-list
Re: PIL: problem to convert an image array to PIL format
On 17 Des, 15:45, Peter Otten __pete...@web.de wrote: This has come up before, see http://mail.python.org/pipermail/python-list/2009-October/1221578.html Peter Thank you! -- http://mail.python.org/mailman/listinfo/python-list
Re: iterators and views of lists
I have a couple of thoughts: 1. Since [:] by convention already creates a copy, it might violate people's expectations if that syntax were used. Indeed, listagent returns self on __getitem__[:]. What I meant was this: x = [0, 1, 2, 3, 4, 5, 6, 7] a = listagent(x)[::2] a[:] = listagent(x)[::-2] And we get x = [7, 1, 5, 3, 3, 5, 1, 7], the copying happens in-place, of course. 2. I'd give the listagent the mutable sequence interface Done! I put the code in a repository here for those who might be interested: http://github.com/aht/listagent.py. In retrospect, the Python gurus here was right though. Copy, modify then replace is good enough, if not better since items are just pointers instead of values. For reversing, you need to translate all the indices (which cost exactly one addition and one multiplication per index). Is that cheaper than copying all the pointers to a new list? For sorting, you definitely need to construct a lookup table since the sort algorithm needs to look over the indices multiple times, which means you are using two pointer indirections per index. Is that cheaper than just copying all the pointers to a new list? Even if there is any benefit at all, you'll need to implement listagent in C to squeeze it out. However, using listagents is faster if you just want a few items out of the slice. And it's cute. Peace, aht -- http://mail.python.org/mailman/listinfo/python-list
Re: Raw string substitution problem
On 12/17/2009 11:24 AM, Richard Brodie wrote:
A raw string is not a distinct type from an ordinary string
in the same way byte strings and Unicode strings are. It
is a merely a notation for constants, like writing integers
in hexadecimal.
(r'\n', u'a', 0x16)
('\\n', u'a', 22)
Yes, that was a mistake. But the problem remains::
re.sub('abc', r'a\nb\n.c\a','123abcdefg') == re.sub('abc',
'a\\nb\\n.c\\a',' 123abcdefg') == re.sub('abc', 'a\nb\n.c\a','123abcdefg')
True
r'a\nb\n.c\a' == 'a\\nb\\n.c\\a' == 'a\nb\n.c\a'
False
Why are the first two strings being treated as if they are the last one?
That is, why isn't '\\' being processed in the obvious way?
This still seems wrong. Why isn't it?
More simply, consider::
re.sub('abc', '\\', '123abcdefg')
Traceback (most recent call last):
File stdin, line 1, in module
File C:\Python26\lib\re.py, line 151, in sub
return _compile(pattern, 0).sub(repl, string, count)
File C:\Python26\lib\re.py, line 273, in _subx
template = _compile_repl(template, pattern)
File C:\Python26\lib\re.py, line 260, in _compile_repl
raise error, v # invalid expression
sre_constants.error: bogus escape (end of line)
Why is this the proper handling of what one might think would be an
obvious substitution?
Thanks,
Alan Isaac
--
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Re: Help with parsing a list
On Dec 17, 6:05 am, Sallu praveen.sunsetpo...@gmail.com wrote: Hi i tried with thunderfoot code error: Traceback (most recent call last): File stdin, line 8, in ? ValueError: need more than 1 value to unpack- Hide quoted text - hence, my 'seemingly' functional qualification. :) that's most likely to due to a datum starting with '\t' instead of ' \t'. yet another reason that emile's code is superior to my one off. -- http://mail.python.org/mailman/listinfo/python-list
Re: Raw string substitution problem
On Thu, 17 Dec 2009 11:51:26 -0500
Alan G Isaac alan.is...@gmail.com wrote:
re.sub('abc', r'a\nb\n.c\a','123abcdefg') == re.sub('abc',
'a\\nb\\n.c\\a',' 123abcdefg') == re.sub('abc', 'a\nb\n.c\a','123abcdefg')
True
Was this a straight cut and paste or did you make a manual change? Is
that leading space in the middle one a copying error? I get False for
what you actually have there for obvious reasons.
r'a\nb\n.c\a' == 'a\\nb\\n.c\\a' == 'a\nb\n.c\a'
False
Why are the first two strings being treated as if they are the last one?
They aren't. The last string is different.
for x in (r'a\nb\n.c\a', 'a\\nb\\n.c\\a', 'a\nb\n.c\a'): print repr(x)
...
'a\\nb\\n.c\\a'
'a\\nb\\n.c\\a'
'a\nb\n.c\x07'
That is, why isn't '\\' being processed in the obvious way?
This still seems wrong. Why isn't it?
What do you think is wrong? What would the obvious way of handling
'//' be?
More simply, consider::
re.sub('abc', '\\', '123abcdefg')
Traceback (most recent call last):
File stdin, line 1, in module
File C:\Python26\lib\re.py, line 151, in sub
return _compile(pattern, 0).sub(repl, string, count)
File C:\Python26\lib\re.py, line 273, in _subx
template = _compile_repl(template, pattern)
File C:\Python26\lib\re.py, line 260, in _compile_repl
raise error, v # invalid expression
sre_constants.error: bogus escape (end of line)
Why is this the proper handling of what one might think would be an
obvious substitution?
Is this what you want? What you have is a re expression consisting of
a single backslash that doesn't escape anything (EOL) so it barfs.
re.sub('abc', r'\\', '123abcdefg')
'123\\defg'
--
D'Arcy J.M. Cain da...@druid.net | Democracy is three wolves
http://www.druid.net/darcy/| and a sheep voting on
+1 416 425 1212 (DoD#0082)(eNTP) | what's for dinner.
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Re: Raw string substitution problem
Alan G Isaac wrote:
On 12/17/2009 11:24 AM, Richard Brodie wrote:
A raw string is not a distinct type from an ordinary string
in the same way byte strings and Unicode strings are. It
is a merely a notation for constants, like writing integers
in hexadecimal.
(r'\n', u'a', 0x16)
('\\n', u'a', 22)
Yes, that was a mistake. But the problem remains::
re.sub('abc', r'a\nb\n.c\a','123abcdefg') == re.sub('abc',
'a\\nb\\n.c\\a',' 123abcdefg') == re.sub('abc', 'a\nb\n.c\a','123abcdefg')
True
r'a\nb\n.c\a' == 'a\\nb\\n.c\\a' == 'a\nb\n.c\a'
False
Why are the first two strings being treated as if they are the last one?
That is, why isn't '\\' being processed in the obvious way?
This still seems wrong. Why isn't it?
More simply, consider::
re.sub('abc', '\\', '123abcdefg')
Traceback (most recent call last):
File stdin, line 1, in module
File C:\Python26\lib\re.py, line 151, in sub
return _compile(pattern, 0).sub(repl, string, count)
File C:\Python26\lib\re.py, line 273, in _subx
template = _compile_repl(template, pattern)
File C:\Python26\lib\re.py, line 260, in _compile_repl
raise error, v # invalid expression
sre_constants.error: bogus escape (end of line)
Why is this the proper handling of what one might think would be an
obvious substitution?
Regular expressions and replacement strings have their own escaping
mechanism, which also uses backslashes.
Some of these regex escape sequences are the same as those of string
literals, eg \n represents a newline; others are different, eg \b in a
regex represents a word boundary and not a backspace as in a string
literal.
You can match a newline in a regex by either using an actual newline
character ('\n' in a string literal) or an escape sequence ('\\n' or
r'\n' in a string literal). If you want a regex to match an actual
backslash followed by a letter 'n' then you need to escape the backslash
in the regex and then either use a raw string literal or escape it again
in a non-raw string literal.
Match characters: newline
Regex: \n
Raw string literal: r'\n'
Non-raw string literal: '\\n'
Match characters: \n
Regex: \\n
Raw string literal: r'\\n'
Non-raw string literal: 'n'
Replace with characters: newline
Replacement: \n
Raw string literal: r'\n'
Non-raw string literal: '\\n'
Replace with characters: \n
Replacement: \\n
Raw string literal: r'\\n'
Non-raw string literal: 'n'
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shouldn't list comprehension be faster than for loops?
Hello all I am testing my code with list comprehensions against for loops. the loop: dipList=[float(val[1]) for val in datalist] dip1=[] for dp in dipList: if dp == 90: dip1.append(dp - 0.01) else: dip1.append(dp) listcomp: dipList=[float(val[1]) for val in datalist] dip1=[(dp, dp-0.01)[dp==90.0] for dp in dipList] Tenting the time spent by each approach (using time.clock()), with a file with about 100,000 entries, I get 0.03s for the loop and 0.05s for the listcomp. thoughts? TIA Carlos -- http://mail.python.org/mailman/listinfo/python-list
Re: Which version of MSVC?90.DLL's to distribute with Python 2.6 based Py2exe executables?
pyt...@bdurham.com wrote: Does anyone have any recommendations on which version of the MSVC?90.DLL's need to be distributed with a Python 2.6.4 PY2EXE (0.6.9) based executable? (I assume I need just a matching pair of MSVCR90.DLL and MSVCP90.DLL?) Either the one the came with your copy Microsoft Visual C++ or Python 2.6.4. Otherwise, you don't have the legal right to redistribute Microsoft's code. Ross Ridge -- l/ // Ross Ridge -- The Great HTMU [oo][oo] rri...@csclub.uwaterloo.ca -()-/()/ http://www.csclub.uwaterloo.ca/~rridge/ db // -- http://mail.python.org/mailman/listinfo/python-list
Re: pyZui - anyone know about this?
On 12/17/2009 2:14 AM, Donn wrote: On Wednesday 16 December 2009 07:03:19 David Roberts wrote: It involves scaling an image to various resolutions, and partitioning them into fixed-size tiles. It's roughly the same technique used by Google Maps/Earth. Thanks. That gives me something to go on. Wikipedia didn't like my search terms. ZUIs are useful for particular types of data - images mapping especially - but I'd hate to have to navigate my desktop using its approach. Ever since Corel Draw in the 90's zoomed into my life I have been in love with the idea of an endless canvas that makes me feel like a satellite on a bungee cord. I think it would fit the desktop very well. Personally I see a merging of normal app windows and a zui: some kind of new window manager. The original idea, perhaps, was from Jef Raskin in The Human Interface. Wikipedia has articles on both. His idea was for a document rather than app centric plain. Not clear how one would pipe data from app to app in his model, though. tjr -- http://mail.python.org/mailman/listinfo/python-list
Re: shouldn't list comprehension be faster than for loops?
* Carlos Grohmann: Hello all I am testing my code with list comprehensions against for loops. the loop: dipList=[float(val[1]) for val in datalist] dip1=[] for dp in dipList: if dp == 90: dip1.append(dp - 0.01) else: dip1.append(dp) listcomp: dipList=[float(val[1]) for val in datalist] dip1=[(dp, dp-0.01)[dp==90.0] for dp in dipList] Tenting the time spent by each approach (using time.clock()), with a file with about 100,000 entries, I get 0.03s for the loop and 0.05s for the listcomp. thoughts? In the list comprehension you're constructing n tuples that you're not constructing in the loop. Have you tried this with dip1 = [dp - 0.01 if dp == 90 else dp for dp in dipList] ? Cheers hth., - Alf -- http://mail.python.org/mailman/listinfo/python-list
Re: Raw string substitution problem
Alan G Isaacalan.is...@gmail.com wrote:
re.sub('abc', r'a\nb\n.c\a','123abcdefg') == re.sub('abc',
'a\\nb\\n.c\\a','123abcdefg') == re.sub('abc', 'a\nb\n.c\a','123abcdefg')
True
Why are the first two strings being treated as if they are the last one?
On 12/17/2009 12:19 PM, D'Arcy J.M. Cain wrote:
They aren't. The last string is different.
Of course it is different.
That is the basis of my question.
Why is it being treated as if it is the same?
(See the end of this post.)
Alan G Isaacalan.is...@gmail.com wrote:
More simply, consider::
re.sub('abc', '\\', '123abcdefg')
Traceback (most recent call last):
File stdin, line 1, inmodule
File C:\Python26\lib\re.py, line 151, in sub
return _compile(pattern, 0).sub(repl, string, count)
File C:\Python26\lib\re.py, line 273, in _subx
template = _compile_repl(template, pattern)
File C:\Python26\lib\re.py, line 260, in _compile_repl
raise error, v # invalid expression
sre_constants.error: bogus escape (end of line)
Why is this the proper handling of what one might think would be an
obvious substitution?
On 12/17/2009 12:19 PM, D'Arcy J.M. Cain wrote:
Is this what you want? What you have is a re expression consisting of
a single backslash that doesn't escape anything (EOL) so it barfs.
re.sub('abc', r'\\', '123abcdefg')
'123\\defg'
Turning again to the documentation:
if it is a string, any backslash escapes in it are processed.
That is, \n is converted to a single newline character, \r is
converted to a linefeed, and so forth.
So why is '\n' converted to a newline but '\\' does not become a literal
backslash? OK, I don't do much string processing, so perhaps this is where
I am missing the point: how is the replacement being converted?
(As Peter's example shows, if you supply the replacement via
a function, this does not happen.) You suggest it is just a matter of
it being an re, but::
re.sub('abc', 'a\\nc','1abcd') == re.sub('abc', 'a\nc','1abcd')
True
re.compile('a\\nc') == re.compile('a\nc')
False
So I have two string that are not the same, nor do they compile
equivalently, yet apparently they are converted to something
equivalent for the substitution. Why? Is my question clearer?
If the answer looks too obvious to state, assume I'm missing it anyway
and please state it. As I said, I seldom use the re module.
Alan Isaac
--
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Re: More stuff added to ch 2 of my programming intro
On Dec 17, 4:33 am, Ned Deily n...@acm.org wrote: In article 183af5d2-e157-4cd6-bec6-8997809e1...@d21g2000yqn.googlegroups.com, Mensanator mensana...@aol.com wrote: Oh, I don't know, maybe because I'm thinking about buying one and seeing 2.3, 2.4 and 2.5 directories on the model in the store made me wary. That's odd since, AFAIK, Apple has never released an OS X with Python 2.4. Hmm...I was poking around in the finder on a display of new iMacs at Best Buy last saturday. I searched for python and it took me to a directory listing with three items: Python 2.3 Python 2.4 Python 2.5 It's possible that Python 2.6 is located somewhere else. I assume that Snow Leopard was installed, but I didn't actually check that. Current Apple systems ship with OS X 10.6, aka Snow Leopard. 10.6 includes a Python 2.6.1 (64-bit/32-bit) and a Python 2.5.4 (32-bit only). The previous release, 10.5, shipped with 2.5 and 2.3. But, not to worry, if you need other versions, you can download OS X installers from python.org. http://www.python.org/download/releases/3.1.1/http://www.python.org/f... on/3.1.1/python-3.1.1.dmg This tells me nothing. That's the disk image for the OS X Python 3.1.1 installer. But it doesn't say whether that disk image is compatible with Snow Leopard and I don't take such things for granted. Official binary installers for OS X are provided on python.org for every final Python release. or (for MacPorts fans): $ sudo port install python31 And since I haven't got one, this also tells me nothing. http://www.macports.org/ The MacPorts Project is an open-source community initiative to design an easy-to-use system for compiling, installing, and upgrading either command-line, X11 or Aqua based open-source software on the Mac OS X operating system. Ok, now I know. Thanks for the information. -- Ned Deily, n...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
Re: More stuff added to ch 2 of my programming intro
On Dec 17, 10:12 am, Benjamin Kaplan benjamin.kap...@case.edu wrote: On Thu, Dec 17, 2009 at 5:33 AM, Ned Deily n...@acm.org wrote: or (for MacPorts fans): $ sudo port install python31 And since I haven't got one, this also tells me nothing. http://www.macports.org/ The MacPorts Project is an open-source community initiative to design an easy-to-use system for compiling, installing, and upgrading either command-line, X11 or Aqua based open-source software on the Mac OS X operating system. Description sans marketing fluff: It's a Mac package manager. It's basically the same as Gentoo's portage if you've ever used that. It downloads source tarballs and patches and then compiles them locally. There are built-in lists of variants, basically sets of configure args, to compile each package. That's the kind of thing I want to hear. Looks like I can go ahead and get a Mac and not worry about getting 3.1.1 installed. Thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: More stuff added to ch 2 of my programming intro
On Dec 17, 1:40 am, geremy condra debat...@gmail.com wrote: On Thu, Dec 17, 2009 at 2:25 AM, Mensanator mensana...@aol.com wrote: On Dec 16, 8:45 pm, Ned Deily n...@acm.org wrote: In article 88bab2c0-d27c-4081-a703-26b353b9e...@9g2000yqa.googlegroups.com, Mensanator mensana...@aol.com wrote: Oh, and about Chapter 1. If you're going to use version 3.1.1 as your standard, shouldn't you also point out that 3.1.1 is NOT bundled with Mac OS X? How about devoting a section on downloading the source files and compiling it on a Mac? Why would you do that? Oh, I don't know, maybe because I'm thinking about buying one and seeing 2.3, 2.4 and 2.5 directories on the model in the store made me wary. http://www.python.org/download/releases/3.1.1/http://www.python.org/f... This tells me nothing. or (for MacPorts fans): $ sudo port install python31 And since I haven't got one, this also tells me nothing. He just told you what it meant, as if it weren't already obvious. Why would it be obvious? I use a PC, for which $ sudo port install python31 is meaningless. Is MacPorts bundled with Snow Leopard? Or do I have to do this first: MacPorts version 1.8.1 is available in various formats for download and installation (note, if you are upgrading your Mac OS X to a new major release, see the migration info page): “dmg” disk images for Snow Leopard, Leopard and Tiger as a legacy platform, containing pkg installers for use with the Mac OS X Installer. By far the simplest installation procedure that most users should follow after meeting the requirements listed below. In source form as either a tar.bz2 package or a tar.gz one for manual compilation, if you intend to customize your installation in any way. SVN checkout of the unpackaged sources, if you wish to follow MacPorts development. The selfupdate target of the port(1) command, for users who already have MacPorts installed and wish to upgrade to a newer release. Checksums for our packaged downloads are contained in the corresponding checksums file. Please note that in order to install and run MacPorts on Mac OS X, your system must have installations of the following components: Apple's Xcode Developer Tools (version 3.2.1 or later for Snow Leopard, 3.1.4 or later for Leopard, or 2.5 for Tiger), found at the Apple Developer Connection site or on your Mac OS X installation CDs/ DVD. Ensure that the optional components for command line development are installed (Unix Development in the Xcode 3.x installer). The X11 windowing environment (A.K.A. “X11 User”) for ports that depend on the functionality it provides to run. The “X11 User” package is an optional installation on your system CDs/ DVD for Tiger, enabled through the “Customize” button of the installer, whereas it is included by default on Leopard and Snow Leopard. You can use the xorg-server port instead of Apple's X11.app if you wish. Geremy Condra -- http://mail.python.org/mailman/listinfo/python-list
Re: pyZui - anyone know about this?
On Thursday 17 December 2009 19:46:41 Terry Reedy wrote: His idea was for a document rather than app centric plain. These days I find the notion of monolithic apps to be a pita. The concept of many small black boxes (but open source) that each do a single job and pipe in/out is so much more powerful. I don't see why everything in a gui and down can't be such a box. Then we get to wire them together as needed. We'd still have 'big apps' but they would be constructed more loosely and we could adapt them to fit real life needs. I dunno. I think big apps are dinosaurs. As much as I love Inkscape and Blender and others, they are all islands with vast gulfs between them. And let's have Python glue them all together! Not clear how one would pipe data from app to app in his model, though. The picture I have of it is illustrated by Blender's material node system. have a look at this pic: http://upload.wikimedia.org/wikipedia/commons/2/26/Working_with_Nodes_Blender.PNG Just a mental jump-off point. Think bash meets zui with a Python driving. :D \d -- \/\/ave: donn.in...@googlewave.com home: http://otherwise.relics.co.za/ 2D vector animation : https://savannah.nongnu.org/projects/things/ Font manager : https://savannah.nongnu.org/projects/fontypython/ -- http://mail.python.org/mailman/listinfo/python-list
Re: PyArg_ParseTupleAndKeywords in Python3.1
In the Ubuntu 9.10 version of Python 3.1 (using your patch), there's a related bug: foo(b='b') will set the value of a in the extension module to zero, thus clearing whatever default value it may have had. In other words, the optional character arguments that are skipped seem to be nulled by PyArg_ParseTupleAndKeywords(). -- http://mail.python.org/mailman/listinfo/python-list
Re: Which version of MSVC?90.DLL's to distribute with Python 2.6 based Py2exe executables?
On Dec 17, 5:36 pm, Ross Ridge rri...@csclub.uwaterloo.ca wrote:
pyt...@bdurham.com wrote:
Does anyone have any recommendations on which version of the
MSVC?90.DLL's need to be distributed with a Python 2.6.4 PY2EXE (0.6.9)
based executable? (I assume I need just a matching pair of MSVCR90.DLL
and MSVCP90.DLL?)
Either the one the came with your copy Microsoft Visual C++ or Python
2.6.4. Otherwise, you don't have the legal right to redistribute
Microsoft's code.
Ross Ridge
--
l/ // Ross Ridge -- The Great HTMU
[oo][oo] rri...@csclub.uwaterloo.ca
-()-/()/ http://www.csclub.uwaterloo.ca/~rridge/
db //
Hi. I clearly haven't yet quite understood this very well.
Only this week I sent a py2exe-derived executable to someone else (a
non-developer) and it would not run on their WinXP machine ('The
system cannot execute the specified program') - my current favourite
hypothesis is that my omission of this dll or something similar was to
blame.
To diagnose what's wrong, I can't get access to the machine that gives
the above error. To try and reproduce, I'm right now in the process of
creating a bare-bones WindowsXP installed on a VM.
My questions are, sadly, legion:
1) I don't understand why the OP's question doesn't deserve a literal
answer - isn't one of those DLLs in the WinSxS directory derived from
his MSVC install? In which case does he have the rights to
redistribute it?
Ross said:
Either the one the came with your copy Microsoft Visual C++ or Python 2.6.4.
2) The required dlls come with Python? Whatwhatwhat? Is this if I
download Python source to compile myself?
2b) Presumably these runtimes must come with Visual Studio express
edition (the free one.) I assume I can just prise the required DLL off
my filesystem after MSVS express edition has installed, rather than
insisting that my users run the MSVC runtime installer at
3) The wxpython site describes that I have to use a manifest file as
well as the DLLs, although I find no mention of the word 'manifest' on
www.py2exe.org, excepting a vaguely worded news item. Other sites (eg.
StackOverflow) report conflicting ideas of whether and when this
manifest file is needed. Is there a simple answer to whether this is
required?
4) The py2exe wiki says, of the msvc runtime dll version 7.1 (for
versions of Python prior to 2.6) that:
Since most Windows installations nowadays include this DLL by
default, it may be unnecessary.
To what extent is this true? Does the same not also apply to the msvc
runtime 9.0 dll? (for Python 2.6.4)
Malcome said:
(I assume I need just a matching pair of MSVCR90.DLL and MSVCP90.DLL?)
5) Whatwhatwhat again? More than one DLL is required? Are there ever
any more than these two?
Sorry to be dense. Terse links to useful sources of information
appreciated. I've read the whole py2exe wiki and been googling the
last hour.
Jonathan
--
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Re: Raw string substitution problem
Alan G Isaac wrote:
Alan G Isaacalan.is...@gmail.com wrote:
re.sub('abc', r'a\nb\n.c\a','123abcdefg') ==
re.sub('abc', 'a\\nb\\n.c\\a','123abcdefg') == re.sub('abc',
'a\nb\n.c\a','123abcdefg')
True
Why are the first two strings being treated as if they are the last one?
On 12/17/2009 12:19 PM, D'Arcy J.M. Cain wrote:
They aren't. The last string is different.
Of course it is different.
That is the basis of my question.
Why is it being treated as if it is the same?
(See the end of this post.)
Alan G Isaacalan.is...@gmail.com wrote:
More simply, consider::
re.sub('abc', '\\', '123abcdefg')
Traceback (most recent call last):
File stdin, line 1, inmodule
File C:\Python26\lib\re.py, line 151, in sub
return _compile(pattern, 0).sub(repl, string, count)
File C:\Python26\lib\re.py, line 273, in _subx
template = _compile_repl(template, pattern)
File C:\Python26\lib\re.py, line 260, in _compile_repl
raise error, v # invalid expression
sre_constants.error: bogus escape (end of line)
Why is this the proper handling of what one might think would be an
obvious substitution?
On 12/17/2009 12:19 PM, D'Arcy J.M. Cain wrote:
Is this what you want? What you have is a re expression consisting of
a single backslash that doesn't escape anything (EOL) so it barfs.
re.sub('abc', r'\\', '123abcdefg')
'123\\defg'
Turning again to the documentation:
if it is a string, any backslash escapes in it are processed.
That is, \n is converted to a single newline character, \r is
converted to a linefeed, and so forth.
So why is '\n' converted to a newline but '\\' does not become a literal
backslash? OK, I don't do much string processing, so perhaps this is where
I am missing the point: how is the replacement being converted?
(As Peter's example shows, if you supply the replacement via
a function, this does not happen.) You suggest it is just a matter of
it being an re, but::
re.sub('abc', 'a\\nc','1abcd') == re.sub('abc', 'a\nc','1abcd')
True
re.compile('a\\nc') == re.compile('a\nc')
False
So I have two string that are not the same, nor do they compile
equivalently, yet apparently they are converted to something
equivalent for the substitution. Why? Is my question clearer?
re.compile('a\\nc') _does_ compile to the same as regex as
re.compile('a\nc').
However, regex objects never compare equal to each other, so, strictly
speaking, re.compile('a\nc') != re.compile('a\nc').
However, having said that, the re module contains a cache (keyed on the
string and options supplied), so the first re.compile('a\nc') will put
the regex object in the cache and the second re.compile('a\nc') will
return that same regex object from the cache. If you clear the cache in
between the two calls (do re._cache.clear()) you'll get two different
regex objects which won't compare equal even though they are to all
intents identical.
If the answer looks too obvious to state, assume I'm missing it anyway
and please state it. As I said, I seldom use the re module.
--
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Re: iterators and views of lists
On Thu, Dec 17, 2009 at 8:41 AM, Anh Hai Trinh anh.hai.tr...@gmail.com wrote: I have a couple of thoughts: 1. Since [:] by convention already creates a copy, it might violate people's expectations if that syntax were used. Indeed, listagent returns self on __getitem__[:]. What I meant was this: x = [0, 1, 2, 3, 4, 5, 6, 7] a = listagent(x)[::2] a[:] = listagent(x)[::-2] And we get x = [7, 1, 5, 3, 3, 5, 1, 7], the copying happens in-place, of course. 2. I'd give the listagent the mutable sequence interface Done! I put the code in a repository here for those who might be interested: http://github.com/aht/listagent.py. In retrospect, the Python gurus here was right though. Copy, modify then replace is good enough, if not better since items are just pointers instead of values. For reversing, you need to translate all the indices (which cost exactly one addition and one multiplication per index). Is that cheaper than copying all the pointers to a new list? For sorting, you definitely need to construct a lookup table since the sort algorithm needs to look over the indices multiple times, which means you are using two pointer indirections per index. Is that cheaper than just copying all the pointers to a new list? Even if there is any benefit at all, you'll need to implement listagent in C to squeeze it out. However, using listagents is faster if you just want a few items out of the slice. And it's cute. Well, it doesn't really need to be any slower than a normal list. You only need to use index and do extra additions because it's in python. However, if listagent were written in C, you would just have a pointer into the contents of the original list, and the length, which is all that list itself has. I don't actually expect you to write that, I'm just pointing it out. As for copying pointers not taking much time... that depends on how long the list is. if you are working with small sets of data, you can do almost anything and it will be efficient. However, if you have megabytes or gigabytes of data (say you are working with images or video), than the difference between an O(1) or an O(n) operation is a big deal. I agree though, it doesn't matter to everyone and anyone. The reason I was interested was because i was trying to solve some specific problems in an elegant way. I was thinking it would be cool to make python more usable in programming competitions by giving it its own port of the STL's algorithm library, which needs something along the lines of C++'s more powerful iterators. -- http://mail.python.org/mailman/listinfo/python-list
Re: Raw string substitution problem
On 12/17/2009 2:45 PM, MRAB wrote:
re.compile('a\\nc') _does_ compile to the same as regex as
re.compile('a\nc').
However, regex objects never compare equal to each other, so, strictly
speaking, re.compile('a\nc') != re.compile('a\nc').
However, having said that, the re module contains a cache (keyed on the
string and options supplied), so the first re.compile('a\nc') will put
the regex object in the cache and the second re.compile('a\nc') will
return that same regex object from the cache. If you clear the cache in
between the two calls (do re._cache.clear()) you'll get two different
regex objects which won't compare equal even though they are to all
intents identical.
OK, this is helpful.
(I did check equality but did not understand
I got True only because re used caching.)
So is the bottom line the following?
A string replacement is not just converted
as described in the documentation, essentially
it is compiled?
But that cannot quite be right. E.g., \b will be a back
space not a word boundary. So then the question arises
again, why isn't '\\' a backslash? Just because?
Why does it not get the obvious conversion?
Thanks,
Alan Isaac
--
http://mail.python.org/mailman/listinfo/python-list
Re: I have a cross platform os.startfile but I need to asociate files with xdg-open in linux how do I do that??
On Dec 16, 3:02 pm, eric_dex...@msn.com eric_dex...@msn.com wrote: On Dec 16, 10:36 am, Paul Boddie p...@boddie.org.uk wrote: On 16 Des, 17:03, eric_dex...@msn.com eric_dex...@msn.com wrote: #this should be a cross platform example of os.startfile ( startfile ) #for windows and linux. this is the first version and #linux, mac, other os's commands for exceptions to the #rule would be appreciated. at some point this will be #in the dex tracker project. You could look at the desktop package for something similar: http://pypi.python.org/pypi/desktop The desktop.open function supports a few extra workarounds, mostly because it pre-dates xdg-open. Paul Since desktop environments like KDE and GNOME provide mechanisms for running browsers and editors according to the identified type of a file or resource, just as Windows runs files or resources, it is appropriate to have a module which accesses these mechanisms. It is this kind of functionality that the desktop package aims to support. Note that this approach is arguably better I am concerned this means I cant do something like associate python files with python in artistx (ubuntu). It just associates text files with editors?? It does look like a cool package and I will look into that further. I suppose I could test the extension.. if '.py' in filename and then default to xdg-open if it isn't seems realy messy though. __ http://dextracker.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: How to create a self-destructing Tkinter dialog box?
On Thu, 17 Dec 2009 02:09:03 -0500, Martin P. Hellwig martin.hell...@dcuktec.org wrote: mrstevegross wrote: Ok, I would like to put together a Python/Tkinter dialog box that displays a simple message and self-destructs after N seconds. Is there a simple way to do this? Thanks, --Steve Just, thinking aloud, I probably would do something like registering the [place|grid|pack]_forget() function by using the alarm callback 'after()' function of that frame. Yup, after() is your friend: #--- from Tkinter import * from functools import partial def RemoveWindow(win): win.destroy() # root window root = Tk() Label(root, text=this is the main window).pack() # another top-level window, to be removed in 2 seconds top = Toplevel() Label(top, text=this is the window to be removed).pack() root.after(2000, partial(RemoveWindow, top)) # go root.mainloop() #--- HTH, John -- http://mail.python.org/mailman/listinfo/python-list
Re: Which version of MSVC?90.DLL's to distribute with Python 2.6 based Py2exe executables?
Jonathan Hartley wrote:
Only this week I sent a py2exe-derived executable to someone else (a
non-developer) and it would not run on their WinXP machine ('The
system cannot execute the specified program') - my current favourite
hypothesis is that my omission of this dll or something similar was to
blame.
To diagnose what's wrong, I can't get access to the machine that gives
the above error. To try and reproduce, I'm right now in the process of
creating a bare-bones WindowsXP installed on a VM.
MSVCR90 is a side-by-side assembly (SxS). You can't just copy a SxS
assembly to another computer. You must at least ship the manifest file,
too. The easiest way to get your program running is the installation of
the MSVCR redistributable installer.
Christian
--
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Re: Raw string substitution problem
Alan G Isaac wrote:
On 12/17/2009 2:45 PM, MRAB wrote:
re.compile('a\\nc') _does_ compile to the same as regex as
re.compile('a\nc').
However, regex objects never compare equal to each other, so, strictly
speaking, re.compile('a\nc') != re.compile('a\nc').
However, having said that, the re module contains a cache (keyed on the
string and options supplied), so the first re.compile('a\nc') will put
the regex object in the cache and the second re.compile('a\nc') will
return that same regex object from the cache. If you clear the cache in
between the two calls (do re._cache.clear()) you'll get two different
regex objects which won't compare equal even though they are to all
intents identical.
OK, this is helpful.
(I did check equality but did not understand
I got True only because re used caching.)
So is the bottom line the following?
A string replacement is not just converted
as described in the documentation, essentially
it is compiled?
But that cannot quite be right. E.g., \b will be a back
space not a word boundary. So then the question arises
again, why isn't '\\' a backslash? Just because?
Why does it not get the obvious conversion?
If you give the re module a string containing \b, eg. '\\b' or r'\b',
then it will compile it to a word boundary if it's in a regex string or
a backspace if it's in a replacement string. This is different from
giving the re module a string which actually contains a backspace, eg,
'\b'.
Because the re module uses backslashes for escaping, you'll need to
escape a literal backslash with a backslash in the string you give it.
But string literals also use backslashes for escaping, so you'll need to
escape each of those backslashes with a backslash.
--
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Re: Which version of MSVC?90.DLL's to distribute with Python 2.6 based Py2exe executables?
Jonathan Hartley tart...@tartley.com wrote: 1) I don't understand why the OP's question doesn't deserve a literal answer ... I gave what I thought was a simple, direct and literal answer. .. isn't one of those DLLs in the WinSxS directory derived from his MSVC install? I have no idea. He might not even have Microsoft Visual C++ installed on his machine. 2) The required dlls come with Python? Whatwhatwhat? The DLLs are required for Python to work, so yes the DLLs are included in the official binary Python distribution for Windows. Is this if I download Python source to compile myself? No, the DLLs aren't included in the source distribution. However, if you compile the Python source yourself with a suitably licenced copy of Microsoft Visual C++ then you'd be allowed to redistribute the Microsoft Runtime DLLs as a part of your own binary Python distribution. 2b) Presumably these runtimes must come with Visual Studio express edition (the free one.) I'd assume so, but you should check the the terms of the EULA for that particular product to make sure it also allows you to redistribute the runtime DLLs. I assume I can just prise the required DLL off my filesystem after MSVS express edition has installed, rather than insisting that my users run the MSVC runtime installer at It would problably simpler to use the DLL included in the redist subdirectory of Microsoft Visual C++ installation. That is, assumming there is one, again you'll need to check the EULA. Sometimes Microsoft makes specific requirements on how its redistributables are packaged and installed, and that definately seems to be the case with Visual C++ 2008. 4) The py2exe wiki says, of the msvc runtime dll version 7.1 (for versions of Python prior to 2.6) that: Since most Windows installations nowadays include this DLL by default, it may be unnecessary. To what extent is this true? It's less true for newer versions of Windows. I know there are a fair number of people running Windows Vista and Windows 7 who've run into problems with my own py2exe wrapped program because their machines don't already have MSVCR71.DLL installed in their system directories. Does the same not also apply to the msvc runtime 9.0 dll? (for Python 2.6.4) I'd assume the problem would be even worse. I don't think Microsoft allows the 9.0 runtime to be installed in system directory, so the specific version of the runtime would need to be already installed the WinSxS directory. Malcome said: (I assume I need just a matching pair of MSVCR90.DLL and MSVCP90.DLL?) 5) Whatwhatwhat again? More than one DLL is required? Are there ever any more than these two? The P DLL is for C++ and so the original poster may not actually need it. I'm pretty sure Python itself doesn't need it, and py2exe shouldn't either, but wxPython, or more precisely wxWidgets, almost certainly does. So in your case you'll probably need to redistribute both DLLs. Ross Ridge -- l/ // Ross Ridge -- The Great HTMU [oo][oo] rri...@csclub.uwaterloo.ca -()-/()/ http://www.csclub.uwaterloo.ca/~rridge/ db // -- http://mail.python.org/mailman/listinfo/python-list
read from bin file
I have a bin file that i read as:
in_file = open('primo.ske', 'rb')
leggo = luca.readlines()
i get a list like :
['\x00\x80p\x8b\x00\x00\x01\x19\x9b\x11\xa1\xa1\x1f\xc9\x12\xaf\x81!
\x84\x01\x00\x01\x01\x02\xff\xff\x80\x01\x03\xb0\x01\x01\x10m\x7f\n',
etc...]
but if i try to print luca[0]
i get not the the string in the list but i get some like ఉ{
how i can get a string like the string in the list?
Thanks Luca
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subprocess.Popen and ordering writes to stdout and stderr
Hi All,
I have this simple function:
def execute(command):
process = Popen(command.split(),stderr=STDOUT,stdout=PIPE)
return process.communicate()[0]
..but my unit test for it fails:
from testfixtures import tempdir,compare
from unittest import TestCase
class TestExecute(TestCase):
@tempdir()
def test_out_and_err(self,d):
path = d.write('test.py','\n'.join((
import sys,
sys.stdout.write('stdout\\n'),
sys.stderr.write('stderr\\n'),
sys.stdout.write('stdout2\\n'),
)),path=True)
compare('stdout\nstderr\nstdout2\n',
execute(sys.executable+' '+path))
...because:
AssertionError:
@@ -1,4 +1,4 @@
-stdout
-stderr
-stdout2
+stdout
+stdout2
+stderr
...the order of the writes isn't preserved.
How can I get this to be the case?
Chris
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- http://www.simplistix.co.uk
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Re: ftplib timeout in Python 2.4
Nico Grubert wrote: I don't know of one so you may need a workaround. What platforms do you need to support? Suse Linux Enterprise 10, 64 Bit with Python 2.4.4. I need the Python 2.4.4 for a running application Server (Zope). OK, then one approach would be to use signals.alarm(timeout) to raise SIGALRM and break out of your FTP function. Have a look at the example at the very bottom of... http://docs.python.org/library/signal.html Roger. -- http://mail.python.org/mailman/listinfo/python-list
Re: subprocess.Popen and ordering writes to stdout and stderr
On 09:15 pm, ch...@simplistix.co.uk wrote:
Hi All,
I have this simple function:
def execute(command):
process = Popen(command.split(),stderr=STDOUT,stdout=PIPE)
return process.communicate()[0]
..but my unit test for it fails:
from testfixtures import tempdir,compare
from unittest import TestCase
class TestExecute(TestCase):
@tempdir()
def test_out_and_err(self,d):
path = d.write('test.py','\n'.join((
import sys,
sys.stdout.write('stdout\\n'),
sys.stderr.write('stderr\\n'),
sys.stdout.write('stdout2\\n'),
)),path=True)
compare('stdout\nstderr\nstdout2\n',
execute(sys.executable+' '+path))
...because:
AssertionError:
@@ -1,4 +1,4 @@
-stdout
-stderr
-stdout2
+stdout
+stdout2
+stderr
...the order of the writes isn't preserved.
How can I get this to be the case?
You probably just need to flush stdout and stderr after each write. You
set them up to go to the same underlying file descriptor, but they still
each have independent buffering on top of that.
Jean-Paul
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Re: subprocess.Popen and ordering writes to stdout and stderr
exar...@twistedmatrix.com wrote: How can I get this to be the case? You probably just need to flush stdout and stderr after each write. You set them up to go to the same underlying file descriptor, but they still each have independent buffering on top of that. Okay, but if I do: os.system(sys.executable+' '+path) ...with test.py as-is, I get things in the correct order. How come? Chris -- Simplistix - Content Management, Batch Processing Python Consulting - http://www.simplistix.co.uk -- http://mail.python.org/mailman/listinfo/python-list
Re: subprocess.Popen and ordering writes to stdout and stderr
On 09:56 pm, ch...@simplistix.co.uk wrote: exar...@twistedmatrix.com wrote: How can I get this to be the case? You probably just need to flush stdout and stderr after each write. You set them up to go to the same underlying file descriptor, but they still each have independent buffering on top of that. Okay, but if I do: os.system(sys.executable+' '+path) ...with test.py as-is, I get things in the correct order. libc is probably giving you line buffering when you use os.system (because the child process inherits the parent's stdio, and the parent's stdio is probably a pty, and that's the policy libc implements). When you use subprocess.Popen, the child process gets a pipe (ie, not a pty) for its stdout/err, and libc gives you block buffering instead. This makes the difference, since your test writes all end with \n - flushing the libc buffer when it's in line buffered mode, but not otherwise. Try the os.system version with the parent process's stdio not attached to a pty (say, 'cat | program | cat') or try giving the subprocess.Popen version a pty of its own (I'm not sure how you do this with subprocess.Popen, though). You should be able to observe the behavior change based on this. Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: subprocess.Popen and ordering writes to stdout and stderr
exar...@twistedmatrix.com wrote: libc is probably giving you line buffering when you use os.system (because the child process inherits the parent's stdio, and the parent's stdio is probably a pty, and that's the policy libc implements). snip Interesting, but do these assertions still hold true when I tell you that I'm doing all this on Windows? ;-) Chris -- Simplistix - Content Management, Batch Processing Python Consulting - http://www.simplistix.co.uk -- http://mail.python.org/mailman/listinfo/python-list
Re: read from bin file
Jerry Hill wrote:
On Thu, Dec 17, 2009 at 3:59 PM, luca72 lucabe...@libero.it wrote:
I have a bin file that i read as:
in_file =pen('primo.ske', 'rb')
leggo =uca.readlines()
i get a list like :
['\x00\x80p\x8b\x00\x00\x01\x19\x9b\x11\xa1\xa1\x1f\xc9\x12\xaf\x81!
\x84\x01\x00\x01\x01\x02\xff\xff\x80\x01\x03\xb0\x01\x01\x10m\x7f\n',
etc...]
but if i try to print luca[0]
i get not the the string in the list but i get some like ఉ{
how i can get a string like the string in the list?
print repr(luca[0])
You have several questions there. First, readlines() doesn't make sense
if the file is binary. Unless you know that \n happens to be a delimiter
in that particular formatted file, it makes more sense to just use
read(), rather than readlines(). And in that case, you get a single
string. You can specify how many bytes you want to read() each time.
Now when you print a list, print calls repr() on each item in the list.
So Jerry is right that repr() is the direct answer to your question.
However, you may want a prettier output, such as that produced by
binascii.hexlify(). A traditional dump file has hex bytes on one side,
and printable characters on the other, with suitable spacing and such.
DaveA
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Re: Which version of MSVC?90.DLL's to distribute with Python 2.6 based Py2exe executables?
On 18/12/2009 7:44 AM, Ross Ridge wrote: The P DLL is for C++ and so the original poster may not actually need it. I'm pretty sure Python itself doesn't need it, and py2exe shouldn't either, but wxPython, or more precisely wxWidgets, almost certainly does. So in your case you'll probably need to redistribute both DLLs. FYI, my experience is that an entire manifest must be distributed. As the manifest in question actually lists 3 DLLs, IIUC, you must ship all 4 files - the 3 DLLs and the manifest, even if only one of the DLLs is actually used. This is from memory some time back though, so apologies in advance if I'm mis-remembering. Mark -- http://mail.python.org/mailman/listinfo/python-list
Re: subprocess.Popen and ordering writes to stdout and stderr
On 18/12/2009 9:33 AM, Chris Withers wrote: exar...@twistedmatrix.com wrote: libc is probably giving you line buffering when you use os.system (because the child process inherits the parent's stdio, and the parent's stdio is probably a pty, and that's the policy libc implements). snip Interesting, but do these assertions still hold true when I tell you that I'm doing all this on Windows? ;-) Yep. You can see similar behaviour from just the cmd-prompt and the following script: -- import sys for i in range(10): print stdout print sys.stderr, stderr -- If you execute it normally from a command-prompt, you will see things written in the correct order. If you execute it like 'python foo.py out 21', the order will be mixed up. If you execute it like 'python -u foo.py out 21' the order is restored. HTH, Mark -- http://mail.python.org/mailman/listinfo/python-list
Re: subprocess.Popen and ordering writes to stdout and stderr
On 12/17/2009 5:33 PM, Chris Withers wrote: exar...@twistedmatrix.com wrote: libc is probably giving you line buffering when you use os.system (because the child process inherits the parent's stdio, and the parent's stdio is probably a pty, and that's the policy libc implements). snip Interesting, but do these assertions still hold true when I tell you that I'm doing all this on Windows? ;-) Which version /-)? You can *fix* the test by sorting before comparing. If the app really requires synchronization of streams, I would just flush when needed and see if that were enough. tjr -- http://mail.python.org/mailman/listinfo/python-list
Re: Raw string substitution problem
On Thu, 17 Dec 2009 20:18:12 -, Alan G Isaac alan.is...@gmail.com
wrote:
So is the bottom line the following?
A string replacement is not just converted
as described in the documentation, essentially
it is compiled?
That depends entirely on what you mean.
But that cannot quite be right. E.g., \b will be a back
space not a word boundary. So then the question arises
again, why isn't '\\' a backslash? Just because?
Why does it not get the obvious conversion?
'\\' *is* a backslash. That string containing a single backslash is then
processed by the re module which sees a backslash, tries to interpret it
as an escape, fails and barfs.
re.compile('a\\nc') passes a sequence of four characters to re.compile:
'a', '\', 'n' and 'c'. re.compile() then does it's own interpretation:
'a' passes through as is, '\' flags an escape which combined with 'n'
produces the newline character (0x0a), and 'c' passes through as is.
re.compile('a\nc') by contrast passes a sequence of three character to
re.compile: 'a', 0x0a and 'c'. re.compile() does it's own interpretation,
which happens not to change any of the characters, resulting in the same
regular expression as before.
Your problem is that you are conflating the compile-time processing of
string literals with the run-time processing of strings specific to re.
--
Rhodri James *-* Wildebeeste Herder to the Masses
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Re: Seek support for new slice syntax PEP.
On Mon, 14 Dec 2009 14:18:49 -0500, Terry Reedy wrote: Many more people uses range objects (xrange in 2.x). A range object has the same info as a slice object *plus* it is iterable. This isn't quite true, as a range cannot have a stop value of None, i.e. you can't represent [n:] or [:] etc as a range. Similarly for using negative stop values for indices relative to the end of the sequence being sliced. Also, aside from the semantics of slice objects themselves, slice notation isn't limited to a single slice object; it can also return a tuple of slices and values, e.g.: numpy.s_[1::2,...,3,4:5:6] (slice(1, None, 2), Ellipsis, 3, slice(4, 5, 6)) For a single slice, enumerating over a slice with an unspecified stop value would be equivalent to itertools.count(). Negative stop values won't work. For a multi-dimensional slice, with everything specified, you would probably want to iterate over the cartesian product (i.e. N nested loops for an N-dimensional slice). But this won't work if anything other than the outermost loop has an unspecified stop value, or if you use an ellipsis within a slice. Oh, and being able to slice a slice could be quite useful, i.e.: [10:90:10][2::2] == [30:90:20] cf: numpy.arange(100)[10:90:10][2::2] array([30, 50, 70]) numpy.arange(100)[30:90:20] array([30, 50, 70]) -- http://mail.python.org/mailman/listinfo/python-list
Parsing file format to ensure file meets criteria
Hi folks,
I am new to python and am having some trouble parsing a file.
I wish to parse a file and ensure that the format meets certain
restrictions.
The file format is as below (abbreviated):
c this is a comment
p wcnf 1468 817439 186181
286 32 0
186191 -198 -1098 0
186191 98 -1098 1123 0
Lines beginning c are comment lines and must precede all other lines.
Lines beginning p are header lines with the numbers being 'nvar', 'nclauses'
and 'hard' respectively.
All other lines are clause lines. These must contain at least two integers
followed by zero. There is no limit on the number of clause lines.
Header lines must precede clause lines.
In the above example:
nvar = 1468
nclauses = 817439
hard = 186191
Now for the interesting part...
The first number in a clause line = weight.
All else are literals.
Therefore, clause = weight + literals
weight = hard
|literal| 0
|literal| = nvar
number of clause lines = nclauses
My attempts thus far have been a dismal failure, computing is so viciously
logical :confused:
My main problem is that below:
fname = raw_input('Please enter the name of the file: ')
z = open(fname, 'r')
z_list = [i.strip().split() for i in z]
#here each line is converted to a list, all nested within a list - all
elements of the list are strings, even integers are converted to strings
Question - how are nested lists indexed?
I then attempted to extract the comment, headers and clauses from the nested
list and assign them to a variable.
I tried:
for inner in z_list:
for lists in inner:
if lists[0] == 'c':
comment = lists[:]
elif lists[0] == 'p':
header = lists[:]
else:
clause = lists[:]
print comment, header, clause
This does not work for some reasons which I understand. I have messed up the
indexing and my assignment of variables is wrong.
The aim was to extract the headers and comments and then be left with a
nested list of clauses.
Then I intended to converted the strings within the clauses nested list back
to integers and via indexing, check that all conditions are met. This would
have involved also converting the numerical strings within the header to
integers but the actual strings are proving a difficult problem to ignore.
Any suggestions?
If my mistakes are irritatingly stupid, please feel free to advise that I
r.t.f.m (read the f**king manual). However, thus far the manual has helped
me little.
Thanking you,
Seafoid.
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Re: Parsing file format to ensure file meets criteria
seafoid wrote:
Hi folks,
I am new to python and am having some trouble parsing a file.
I wish to parse a file and ensure that the format meets certain
restrictions.
The file format is as below (abbreviated):
c this is a comment
p wcnf 1468 817439 186181
286 32 0
186191 -198 -1098 0
186191 98 -1098 1123 0
Lines beginning c are comment lines and must precede all other lines.
Lines beginning p are header lines with the numbers being 'nvar', 'nclauses'
and 'hard' respectively.
All other lines are clause lines. These must contain at least two integers
followed by zero. There is no limit on the number of clause lines.
Header lines must precede clause lines.
In the above example:
nvar = 1468
nclauses = 817439
hard = 186191
Now for the interesting part...
The first number in a clause line = weight.
All else are literals.
Therefore, clause = weight + literals
weight = hard
|literal| 0
|literal| = nvar
number of clause lines = nclauses
My attempts thus far have been a dismal failure, computing is so viciously
logical :confused:
My main problem is that below:
fname = raw_input('Please enter the name of the file: ')
z = open(fname, 'r')
z_list = [i.strip().split() for i in z]
#here each line is converted to a list, all nested within a list - all
elements of the list are strings, even integers are converted to strings
Question - how are nested lists indexed?
A list is indexed by integers:
my_list = ['a', 'b', 'c']
my_list[0]
'a'
A list of lists requires 2 subscripts, one for the list and the other
for the list in that list:
my_list = [['a', 'b'], ['c', 'd']]
my_list[0]
['a', 'b']
my_list[0][1]
'b'
I then attempted to extract the comment, headers and clauses from the nested
list and assign them to a variable.
I tried:
z_list is a list of lines, where each line is a list of words.
For example, is the file contains:
c this is a comment
p wcnf 1468 817439 186181
then z_list contains:
[['c', 'this', 'is', 'a', 'comment'], ['p', 'wcnf', '1468',
'817439', '186181']]
for inner in z_list:
for lists in inner:
if lists[0] == 'c':
comment = lists[:]
elif lists[0] == 'p':
header = lists[:]
else:
clause = lists[:]
print comment, header, clause
This does not work for some reasons which I understand. I have messed up the
indexing and my assignment of variables is wrong.
The aim was to extract the headers and comments and then be left with a
nested list of clauses.
Then I intended to converted the strings within the clauses nested list back
to integers and via indexing, check that all conditions are met. This would
have involved also converting the numerical strings within the header to
integers but the actual strings are proving a difficult problem to ignore.
Any suggestions?
If my mistakes are irritatingly stupid, please feel free to advise that I
r.t.f.m (read the f**king manual). However, thus far the manual has helped
me little.
--
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Re: Parsing file format to ensure file meets criteria
seafoid fitzp...@tcd.ie writes: Hi folks, I am new to python and am having some trouble parsing a file. It really sounds like you need something that generates a parser for you based on a grammar instead of trying to code your own parser. See: http://wiki.python.org/moin/LanguageParsing for an overview of modules. -- John Bokma Read my blog: http://johnbokma.com/ Hire me (Perl/Python): http://castleamber.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Parsing file format to ensure file meets criteria
MRAB-2 Thank you for that! Funny how something so simple clarifies a whole lot! I will crack on now! Once again, Cheers and Thanks! -- View this message in context: http://old.nabble.com/Parsing-file-format-to-ensure-file-meets-criteria-tp26837682p26838085.html Sent from the Python - python-list mailing list archive at Nabble.com. -- http://mail.python.org/mailman/listinfo/python-list
Re: Parsing file format to ensure file meets criteria
Hi John, I considered that, but in an attempt to really figure out this supposedly simple language, I figure that I should try and solve this. I will check out the modules for future reference. Thanks, Seafoid :-) -- View this message in context: http://old.nabble.com/Parsing-file-format-to-ensure-file-meets-criteria-tp26837682p26838132.html Sent from the Python - python-list mailing list archive at Nabble.com. -- http://mail.python.org/mailman/listinfo/python-list
Re: More stuff added to ch 2 of my programming intro
In article b0b60848-9a66-4f84-ab89-d84ea3904...@a21g2000yqc.googlegroups.com, Mensanator mensana...@aol.com wrote: That's the disk image for the OS X Python 3.1.1 installer. But it doesn't say whether that disk image is compatible with Snow Leopard and I don't take such things for granted. That's a good point. There should be stated there somewhere about which operating systems are supported. For the record, 3.1.1 has been tested on 10.4, 10.5, and 10.6 and should work on 10.3.9. -- Ned Deily, n...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
Re: iterators and views of lists
On Thu, 17 Dec 2009 12:07:59 -0800, Brendan Miller wrote: I was thinking it would be cool to make python more usable in programming competitions by giving it its own port of the STL's algorithm library, which needs something along the lines of C++'s more powerful iterators. For the benefit of those of us who aren't C++ programmers, what do its iterators do that Python's don't? -- Steven -- http://mail.python.org/mailman/listinfo/python-list
ANN: Zeus for Windows IDE Version 3.97a
The latest 3.97a release of the Zeus for Windows IDE is now available: http://www.zeusedit.com/whatsnew.html Zeus is fully configurable, language neutral IDE. It comes pre-configured with Python syntax highlighting and code folding. It is also possible to write Zeus scripts using Python. Jussi Jumppanen Author: Zeus for Windows -- http://mail.python.org/mailman/listinfo/python-list
imports in __init__.py
I use distutils / setup.py to install 'packagename', where... /packagename __init__.py modulename.py modulename.py has a class named 'classname'. From an arbitrary python module, I 'import packagename'. In said module, I want to use the 'classname' class from 'packagename.modulename', by doing 'packagename.classname(params)'. I have seen this done by having either 'import modulename' and/or 'from modulename import *' in 'packagename's __init__.py. I don't really know which one or combination of them would work, but I can't get it to work either way. Unless I am missing something, webpy does this with, among other things, its application class that is in application.py. From a new web app, you would just use web.application (params). I am using Python 3.1.1, although I don't think that should matter. Any help is appreciated. Thanks! -- http://mail.python.org/mailman/listinfo/python-list
Re: imports in __init__.py
Phil phil...@gmail.com writes: I use distutils / setup.py to install 'packagename', where... /packagename __init__.py modulename.py modulename.py has a class named 'classname'. As per PEP 8, it's best if user-defined classes are named with TitleCase, so ‘ClassName’. From an arbitrary python module, I 'import packagename'. At that point, you have all the names that were defined within ‘packagename’, available inside the namespace ‘packagename’. Since ‘modulename’ is a module in that package, the module's namespace is available to you via ‘packagename.modulename’. In said module, I want to use the 'classname' class from 'packagename.modulename', by doing 'packagename.classname(params)'. The name ‘ClassName’ is not in the namespace ‘packagename’. It is in the namespace ‘packagename.modulename’, so you'll need to access it there:: import packagename.modulename packagename.modulename.ClassName(params) You can import the class from that namespace explicitly:: from packagename.modulename import ClassName ClassName(params) or you can import the module from the package namespace:: from packagename import modulename modulename.ClassName(params) I have seen this done by having either 'import modulename' and/or 'from modulename import *' in 'packagename's __init__.py. Importing the module in the package would mean you would not have to import the module yourself when using the package; it would not change the qualification necessary of the namespace. Importing using the ‘from foo import *’ form is usually a bad idea, since it clobbers namespaces and makes it impossible to tell by looking at the import code where the name ‘ClassName’ appeared from. Best to import only explicit names, as above. If you want to abbreviate, you can use the ability to rename while importing:: import packagename.modulename as foo foo.ClassName(params) which keeps the names explicit and traceable. -- \ “Give a man a fish, and you'll feed him for a day; give him a | `\religion, and he'll starve to death while praying for a fish.” | _o__) —Anonymous | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: imports in __init__.py
I understand all of the above, including the reasons as to why this is bad. For purposes of experimenting, I would still like to do it. I guess I'm (still) wondering how it is done in webpy. I recall seeing it done elsewhere too. All I noticed was that in webpy's package 'web', it defines the 'application' class in 'application.py'. And in web's __init__.py it has... from application import * And in whatever app you are creating, it has... import web app = web.application(params) That being said, I can't get similar functionality with my own package. Is there more to this? Within my package's __init__.py, I am unable to import a module from the package without an import error. Thanks again! -- http://mail.python.org/mailman/listinfo/python-list
ANN: withrestart 0.2.1
Hi All, Apologies if you receive multiple copies of this, my python-announce posts don't seem to be making it through. I've just released a new python module called withrestart. It's an attempted Pythonisation of the restart-based condition system of Common Lisp. Details are on PyPI: http://pypi.python.org/pypi/withrestart/0.2.1 For an introduction to conditions and restarts, see Beyond Exception Handling by Peter Seibel: http://www.gigamonkeys.com/book/beyond-exception-handling-conditions-and-restarts.html For a quick demo of the module in action, keep reading... Cheers, Ryan About withrestart: -- Version: 0.2.1 Licence: MIT Source: http://github.com/rfk/withrestart withrestart is a Pythonisation (Lispers might rightly say bastardisation) of the restart-based condition system of Common Lisp. It's designed to make error recovery simpler and easier by removing the assumption that unhandled errors must be fatal. A restart represents a named strategy for resuming execution of a function after the occurrence of an error. At any point during its execution a function can push a Restart object onto its call stack. If an exception occurs within the scope of that Restart, code higher-up in the call chain can invoke it to recover from the error and let the function continue execution. By providing several restarts, functions can offer several different strategies for recovering from errors. A handler represents a higher-level strategy for dealing with the occurrence of an error. It is conceptually similar to an except clause, in that one establishes a suite of Handler objects to be invoked if an error occurs during the execution of some code. There is, however, a crucial difference: handlers are executed without unwinding the call stack. They thus have the opportunity to take corrective action and then resume execution of whatever function raised the error. As an example, here's a function that doesn't like the number seven: def anything_but_seven(v): if v == 7: raise ValueError(Argh! A Seven!) return v And here's a function that can recover from the occurrence of a seven using the pre-defined restarts skip and use_value: def sum_items(items): total = 0 for i in items: with restarts(skip,use_value) as invoke: total += invoke(anything_but_seven,i) return total Naively calling this will raise a ValueError: sum_items(range(8)) Traceback (most recent call last): ... ValueError: Argh! A Seven! But if we handle ValueErrors by invoking the skip restart, we can still get the sum of the remaining items: with Handler(ValueError,skip): ... sum_items(range(8)) ... 21 Alternately, we can invoke the use_value restart to replace the sevens with another value: with Handler(ValueError,use_value,12): ... sum_items(range(8)) ... 33 By splitting the responsibility for error recovery between Handlers and Restarts, we can cleanly separate the low-level mechanics of recovering from an error from the high-level decisions about what sort of recovery to perform. -- Ryan Kelly http://www.rfk.id.au | This message is digitally signed. Please visit r...@rfk.id.au| http://www.rfk.id.au/ramblings/gpg/ for details signature.asc Description: This is a digitally signed message part -- http://mail.python.org/mailman/listinfo/python-list
Re: iterators and views of lists
On Thu, Dec 17, 2009 at 6:44 PM, Steven D'Aprano st...@remove-this-cybersource.com.au wrote: On Thu, 17 Dec 2009 12:07:59 -0800, Brendan Miller wrote: I was thinking it would be cool to make python more usable in programming competitions by giving it its own port of the STL's algorithm library, which needs something along the lines of C++'s more powerful iterators. For the benefit of those of us who aren't C++ programmers, what do its iterators do that Python's don't? Python iterators basically only have one operation: next(), which returns the next element or throws StopIteration. In C++ terminology this is a Input iterator. It is good for writing for each loops or map reduce operations. An input iterator can't mutate the data it points to. C++ also has progressively stronger iterators: http://www.sgi.com/tech/stl/Iterators.html InputIterator - read only, one direction, single pass ForwardIterator - read/write, one direction, multi pass BidirectionalIterator - read/write, can move in either direction RandomAccessIterator - read/write, can move in either direction by an arbitrary amount in constant time (as powerful as a pointer) Each only adds extra operations over the one before. So a RandomAccessIterator can be used anywhere a InputIterator can, but not vice versa. Also, this is a duck typing relationship, not a formal class inheritance. Anything that quacks like a RandomAccessIterator is a RandomAccessIterator, but there is no actual RandomAccessIterator class. So, for instance stl sort function takes pair of random access iterator delimiting a range, and can sort any datastructure that can provide that powerful of an iterator (arrays, vectors, deques). http://www.sgi.com/tech/stl/sort.html MyCollection stuff; // put some stuff in stuff sort(stuff.begin(), stuff.end()); Where begin() and end() by convention return iterators pointing to the beginning and end of the sequence. -- http://mail.python.org/mailman/listinfo/python-list
Re: regex help
On Wed, Dec 16, 2009 at 10:46 PM, Gabriel Rossetti gabriel.rosse...@arimaz.com wrote: Hello everyone, I'm going nuts with some regex, could someone please show me what I'm doing wrong? I have an XMPP msg : message xmlns='jabber:client' to='n...@host.com' mynode xmlns='myprotocol:core' version='1.0' type='mytype' parameters param1123/param1 param2456/param2 /parameters payload type='plain'.../payload /mynode x xmlns='jabber:x:expire' seconds='15'/ /message the parameter node may be absent or empty (parameter/), the x node may be absent. I'd like to grab everything exept the payload nod and create something new using regex, with the XMPP message example above I'd get this : message xmlns='jabber:client' to='n...@host.com' mynode xmlns='myprotocol:core' version='1.0' type='mytype' parameters param1123/param1 param2456/param2 /parameters /mynode x xmlns='jabber:x:expire' seconds='15'/ /message for some reason my regex doesn't work correctly : r(message .*?).*?(mynode .*?).*?(?:(parameters.*?/parameters)|parameters/)?.*?(x .*/)? If all you need is to remove payload node ,this could be useful, s1=message xmlns='jabber:client' to='n...@host.com'mynode xmlns='myprotocol:core' version='1.0' type='mytype'parametersparam1123/param1param2456/param2/parameterspayload type='plain'.../payload/mynodex xmlns='jabber:x:expire' seconds='15'//message pat=re.compile(rpayload.*\/payload) s1=pat.sub(,s1) -- Regards, S.Selvam -- http://mail.python.org/mailman/listinfo/python-list
Re: Raw string substitution problem
MRAB wrote: Regular expressions and replacement strings have their own escaping mechanism, which also uses backslashes. This seems like a misfeature to me. It makes sense for a regular expression to give special meanings to backslash sequences, because it's a sublanguage with its own syntax. But I can't see any earthly reason to do that with the *replacement* string, which is just data. It looks like a feature that's been blindly copied over from Perl without thinking about whether it makes sense in Python. -- Greg -- http://mail.python.org/mailman/listinfo/python-list
share dictionary between processes
Hi,
I want to share dictionary between two distinct processes.
Something like this:
first.py
import magic_share_module
def create_dictionary():
return {a: 1}
magic_share_module.share(shared_dictionary,
creator.create_dictionary)
while True:
pass
second.py
import magic_share_module
d = magic_share_module.get_shared(shared_dictionary)
print d[a]
And then run in command line:
python first.py
sleep 1
python second.py
I have looked at POSH, but it requires master process that will fork
childs. I want read-only sharing between completely unrelated
processes.
Is it possible?
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[issue7528] Provide PyLong_AsLongAndOverflow compatibility to Python 2.x
New submission from Case Van Horsen cas...@gmail.com:
When I ported gmpy to Python 3.x, I began to use
PyLong_AsLongAndOverflow frequently. I found the code to slightly faster
and cleaner than using PyLong_AsLong and checking for overflow. I had
several code fragments that looked like:
#if PY_MAJOR_VERSION == 2
if(PyInt_Check(b)) {
temp = PyInt_AS_LONG(b));
Do stuff with temp.
}
#endif
if(PyLong_Check(b)) {
#if PY_MAJOR_VERSION == 3
temp = PyLong_AsLongAndOverflow(b, overflow);
if(overflow) {
#else
temp = PyLong_AsLong(b);
if(PyErr_Occurred()) {
PyErr_Clear();
#endif
Convert b to an mpz.
} else {
Do stuff with temp.
}
}
I wanted to use the PyLong_AsLongAndOverflow method with Python 2.x so I
extracted the code for PyLong_AsLongAndOverflow, tweeked it to accept
either PyInt or PyLong, and called it PyIntOrLong_AsLongAndOverflow. I
also defined PyIntOrLong_Check.
The same code fragment now looks like:
if(PyIntOrLong_Check(b)) {
temp = PyIntOrLong_AsLongAndOverflow(b, overflow);
if(overflow) {
Convert b to an mpz.
} else {
Do stuff with temp.
}
}
Is it possible to include a py3intcompat.c file with Python 2.7 that
provides this function (and possibly others) for extension authors to
include with their extension? A previous example is pymemcompat.h which
was made available in the Misc directory.
I'm specifically not in favor of adding it to the Python 2.7 API but
just in providing a file for extension authors to use. I've attached a
initial version that compiles successfully with Python 2.4+.
I'm willing to add additional functions, documentation, etc.
--
components: Extension Modules
messages: 96505
nosy: casevh
severity: normal
status: open
title: Provide PyLong_AsLongAndOverflow compatibility to Python 2.x
type: feature request
versions: Python 2.7
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http://bugs.python.org/issue7528
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[issue7528] Provide PyLong_AsLongAndOverflow compatibility to Python 2.x
Case Van Horsen cas...@gmail.com added the comment: Attached py3intcompat.c -- Added file: http://bugs.python.org/file15579/py3intcompat.c ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7528 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7518] Some functions in pymath.c should be moved elsewhere.
Mark Dickinson dicki...@gmail.com added the comment: So the configure test for tanh(-0.0) is purely informational: it doesn't affect the behaviour of the built Python in any way. I agree that the test is imperfect, in that if atan2 is also non-conformant on the given platform then the sign issue with tanh may go undetected, but all that happens in that case is that we get a bogus 'preserves sign of -0 ... yes' message in the configure output. The wrapper for atan2 in Modules/mathmodules.c is a separate issue; it should ensure that we get the right behaviour for atan2 on all platforms, including msvc 7.0. I can't immediately see any reason why it wouldn't be working as intended. I don't think that python cmath tests will pass with MSVC before 8.0. Which test(s) do you think will fail? May be is good to add depends=['_math.h'], for modules in setup.py. Good point---thanks! Done in r76865 (trunk), r76867 (py3k). -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7518 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7529] StreamHandler does not live in logging.Handlers
New submission from Chris Withers ch...@simplistix.co.uk: http://docs.python.org/library/logging.html#module-logging.handlers ...explains that StreamHandler lives in logging but then the class docs say logging.handlers. Georg, if this isn't trivial for you to fix, re-assign it to me and I'll make the changes when I get a chance :-) cheers, Chris -- assignee: georg.brandl components: Documentation messages: 96508 nosy: cjw296, georg.brandl severity: normal status: open title: StreamHandler does not live in logging.Handlers versions: Python 2.6, Python 2.7 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7529 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7497] configure test for posix_semaphore capability leaves semaphore behind, causing test to fail for other users
Mark Dickinson dicki...@gmail.com added the comment: The configure test for enabled POSIX semaphores is now failing for me on OS X 10.6: the test produces sem_open: Permission denied -- assignee: - mark.dickinson status: closed - open ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7497 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3588] sysconfig variable LINKFORSHARED has wrong value for MacOS X framework build
Tarek Ziadé ziade.ta...@gmail.com added the comment: I agree with Ronald: making sure all variables in Makefile provide values that can work in any environment just because distutils offers an API to read them would be a major pain. What is planned is to remove sysconfig from distutils, and have it in the stdlib, with a private module built when ./configure is called, that would contain these variables. And maybe we could filter out some variables in this process to keep only the ones that can be used by code in all environments. IOW, if python-config provides what you need, LINKFORSHARED could be filtered out so the API cannot return it. -- assignee: - tarek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue3588 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7381] subprocess.check_output: docstring has inconsistent leading whitespace
flox la...@yahoo.fr added the comment: Patch updated to backport r51536 in trunk. It makes python -3 happier (do not compare None = 0). -- Added file: http://bugs.python.org/file15580/issue7381_v2.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7381 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7381] subprocess.check_output: docstring has inconsistent leading whitespace
Changes by flox la...@yahoo.fr: Added file: http://bugs.python.org/file15581/issue7381_py3k_v2.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7381 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
