Oblique Strategies
The Oblique Strategies were originally a set of one-hundred cards, each bearing a short phrase. They were devised by Brian Eno and Peter Schmidt as ways of working through creative problems. When a blockage occurs, draw a card, and see if it can direct you in a tangential way that helps solve the problem. I have created a Python implementation that includes two different decks. Since one of these is my own, I can be sure this is an original contribution for all of you Python coders stuck on a problem! Surf: http://noisetheatre.blogspot.com/2005/09/oblique-strategies.html - robin noisetheatre.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Oblique Strategies
Tom Anderson <[EMAIL PROTECTED]> wrote: >On Wed, 14 Sep 2005, robin wrote: > >> The Oblique Strategies were originally a set of one-hundred cards, each >> bearing a short phrase. They were devised by Brian Eno and Peter Schmidt >> as ways of working through creative problems. When a blockage occurs, >> draw a card, and see if it can direct you in a tangential way that helps >> solve the problem. > >Neat! > >I can't help but feel that putting the strategies in a file and using >'fortune' to pick them would have been slightly simpler, but since i don't >actually seem to have fortune on my machine, i'm actually rather happy >that you've done this. The best things about this approach are that code and data are in one file and you don't need to be on a machine with fortune. (My machines seem to mostly have misfortune, aka Windows.) I'm happy how Python reduces most small problems down to the most trivial of exercises. This is less a program than a list of text strings. - robin noisetheatre.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Britney Spears nude
"Ian Osgood" <[EMAIL PROTECTED]> wrote: >Wouldn't Natasha Kinski be more apropos for this newsgroup? (In case >Python needs a poster girl...) > >http://snakeskins0.tripod.com/eden.html That would be Nastassja Kinski. But you are correct, it is a python. Photo by Richard Avedon. - robin noisetheatre.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
wanted: visual report templating system
I am looking for a client/server reporting tool to use with a web application built in Python. It would consist of three parts: 1. a data definition & retrieval engine that interfaces to RDBMS or other data files 2. a visual designer in which a nontechnical person can create a report layout template (supporting charts, text, graphics, etc.) 3. a server engine to merge the two and create on-the-fly reports when requested programmatically. A similar application would be the ReportMill product for Java: http://www.reportmill.com/product/ Price should not exceed 4 figures (in US$). Seems like a reasonable expectation, but all I am readily aware of in this market is ReportLab. Any suggestions? -- robin -- http://mail.python.org/mailman/listinfo/python-list
Re: SimpleRPCServer
Skip Montanaro <[EMAIL PROTECTED]> wrote: >First, from my reading of SimpleXMLRPCServer, I don't think _dispatch() >belongs at that level. It belongs in the request handler class or in a >separate dispatcher class, depending on what version of Python you're using. Quite so. As a variant I just use verify_request() to persist the client IP address, and then wait until _dispatch() to do everything else. class RPCServer(SimpleXMLRPCServer): def verify_request(self, handler, address): self.client_ip, self.client_port = address return True def _dispatch(self, method, args): do_something(self.client_ip) Though using a firewall would not be remiss. :-) -- robin -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Cookbook, 2'nd. Edition is published
Cameron Laird wrote: >IT'S IN THERE. The answer to all questions--well, to >surprisingly many questions--is in the Second Edition. >Even questions about the Second Edition itself are >answered therein. So, the summary: if in doubt, as- >sume that the Second Edition has what you want. It even has been known to answer questions about the Third Edition, using the "from future" construct publishers have wanted for years. :-) This is a fantastic book and my single favourite Python paper reference. It examines problems, even those which at first seem trivial, with an unexpected rigour and invigorating sense of adventure. Alex Martelli and the others should be congratulated. -- robin -- http://mail.python.org/mailman/listinfo/python-list
Re: TOC of Python Cookbook now online (was Re: author index for Python Cookbook 2?)
[EMAIL PROTECTED] wrote: >I emailed the O'Reilly webmaster, and the table of contents are now >online at http://www.oreilly.com/catalog/pythoncook2/toc.html and also >listed below. Unfortunately there is no list of authors for the sections in the book. This is likely its only shortcoming! -- robin -- http://mail.python.org/mailman/listinfo/python-list
html 2 plain text
hi, i remember seeing this simple python function which would take raw html and output the content (body?) of the page as plain text (no <..> tags etc) i have been looking at htmllib and htmlparser but this all seems to complicated for what i'm looking for. i just need the main text in the body of some arbitrary webbpage to then do some natural-language processing with it... thanks for pointing me to some helpful resources! robin -- http://mail.python.org/mailman/listinfo/python-list
Re: html 2 plain text
lucks yummy. merci beaucoup. robin -- http://mail.python.org/mailman/listinfo/python-list
summarize text
hello list, does anyone know of a library which permits to summarise text? i've been looking at nltk but haven't found anything yet. any help would be very welcome. thank you all in advance, robin -- http://mail.python.org/mailman/listinfo/python-list
problem with google api / xml
hello, i installed SOAPpy 0.12.0 and pyXML 0.8.4 in order to try out the google-search example in diveintopython http://diveintopython.org/soap_web_services/index.html however, i'v been trying and trying and won't get it to work :-( whenever i run this code, i get the attached exception... from SOAPpy import WSDL WSDLFILE = '/pathtomy/googleapi/GoogleSearch.wsdl' APIKEY = '' _server = WSDL.Proxy(WSDLFILE) any help would be very much appreciated! thanks in advance, robin Traceback (most recent call last): File "", line 1, in ? File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/SOAPpy/WSDL.py", line 67, in __init__ self.wsdl = reader.loadFromString(str(wsdlsource)) File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/SOAPpy/wstools/WSDLTools.py", line 47, in loadFromString return self.loadFromStream(StringIO(data)) File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/SOAPpy/wstools/WSDLTools.py", line 28, in loadFromStream document = DOM.loadDocument(stream) File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/SOAPpy/wstools/Utility.py", line 602, in loadDocument return xml.dom.minidom.parse(data) File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/_xmlplus/dom/minidom.py", line 1915, in parse return expatbuilder.parse(file) File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/_xmlplus/dom/expatbuilder.py", line 930, in parse result = builder.parseFile(file) File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/_xmlplus/dom/expatbuilder.py", line 207, in parseFile parser.Parse(buffer, 0) xml.parsers.expat.ExpatError: not well-formed (invalid token): line 1, column 0 -- http://mail.python.org/mailman/listinfo/python-list
Re: summarize text
thanks for all your replies. lemur looks pretty interesting! robin gene tani wrote: > robin wrote: > > hello list, > > > > does anyone know of a library which permits to summarise text? i've > > been looking at nltk but haven't found anything yet. any help would be > > unclear what you're asking, maybe look at: > http://www.cs.waikato.ac.nz/~ml/weka/index.html > > http://www.kdnuggets.com/software/suites.html > http://www.ailab.si/orange > > http://mallet.cs.umass.edu/index.php/Main_Page > http://minorthird.sourceforge.net/ > http://www.dia.uniroma3.it/db/roadRunner/ > > http://www.lemurproject.org/ -- http://mail.python.org/mailman/listinfo/python-list
Re: problem with google api / xml
hi kent, thanks for your reply. in fact it was me who put "pathtomy" into the path and exchanged my apikey with "" i prefer not everyone to know the name of my directories and even less my apikey. so the problem isn't there :-( hope to find some other solution thanks!! robin Mike Kent wrote: > robin wrote: > > > from SOAPpy import WSDL > > WSDLFILE = '/pathtomy/googleapi/GoogleSearch.wsdl' > > APIKEY = '' > > _server = WSDL.Proxy(WSDLFILE) > > Robin, note this part of the URI set in WSDLFILE: > '/pathtomy/googleapi'. Get it? 'path to my google api'. You must set > this part to the actual path where the file 'GoogleSearch.wsdl' is > found. In addition, doesn't APIKEY = '' look a bit odd to you? > Hmm, what could this mean. APIKEY. Perhaps you need to get an API key > from Google in order to use their search API, and fill it in there? > > ;-) -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: Pocoo (bulletin board software) 0.1 beta released
Georg Brandl <[EMAIL PROTECTED]> wrote: >The 0.1 release is not meant to be feature complete. It's more like a preview >to show off what's already there. If you like the idea, *feel free to join us!* Looks very nice so far. Will fill an important gap in Python apps. Oh, and you've been blogged: http://diagrammes-modernes.blogspot.com/ - robin noisetheatre.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Using Beautiful Soup to entangle bookmarks.html
"George Sakkis" <[EMAIL PROTECTED]> wrote: >Here's what I came up with: >http://rafb.net/paste/results/G91EAo70.html. Tested only on my >bookmarks; see if it works for you. That URL is dead. Got another? - robin noisetheatre.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: beta.python.org content
Steve Holden <[EMAIL PROTECTED]> wrote: >How does > > http://beta.python.org/about/beginners/ > >look? There are several things wrong with the interface. First, I count seven ways of formatting a link. This is approximately five too many and can be fixed as follows. "For Beginners" is italicised, supposedly to indicate it is the page we are currently on. This overloads the normal expected meaning of italics with something unexpected. And what is the point of a link to the current page? This should be plain text. "About" is a top-level menu which has been expanded; to indicate this there is a yellow bar. This is not necessary since the viewer can see the menu is expanded. :-) The menu items underneath an expanded heading should be in the same format, but offset. Same format says "menu"; offset says "child." The last menu items are in different formats yet again (typeface and size). I see no reason for this. Once this has been done there will be but two different ways of formatting a link: a menu and a link in the page body. In terms of page space, the horizontal bar at the top seems wasted. Perhaps the vertical bar is all that is needed? The other elements could be relocated. The menu is structured with a list and formatted with CSS. Good! Given that there is already a hierarchical organisation of the content voa the collapsing menu bar, I do not think that another representation of this is required above the main page text. I would ditch the link trail. Overall, the look is very "safe corporate". I myself would have gone for a funkier (though still elegant) look. The energy of the Python community is not being communicated. The vim of the language is diluted. This is not playing to Python's strengths. Yes, i have been known to do this for a living. Had I been aware earlier, I would have been happy to help with the redesign. How can I now? P.S. I am not averse to the new logo. It is professional, clean, and symbolic. Maybe there are more ideal choices but we have to get beyond little green cartoon snakes eventually. - robin noisetheatre.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: How many web framework for python ?
Steve Holden <[EMAIL PROTECTED]> wrote: >Damn. More reading ... Even more reading as of tomorrow, when I get my Web Application Framework article up on my blog. Even listing the vast number of frameworks & toolkits out there is daunting, so I figured I may as well share my own outlook. And FWIW, I have abandoned my own contribution, so that's one less out in the wild! - robin noisetheatre.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: new wooden door step - fixing and finishing
Jeffrey Schwab <[EMAIL PROTECTED]> wrote: >> I was wondering about treating it >> wilth liberal amounts of Teak Oil or similar... > >Some people, when confronted with a problem, think "I know, I?ll use >Teak Oil." Now they have two problems. +1 QOTW BTW, I integrated a similar line into one of my readings (I sideline as a poet), a piece entitled "Advice For Modern Living". Goes like this: "When confronted with a conflict some people go to a solicitor for advice. Now they have two problems." - robin noisetheatre.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
changing params in while loop
hi,
i'm a newbie, but please bear with me for a second.
i have this function inside a while-loop, which i'd like to loop
forever, but i'm not sure about how to change the parameters of my
function once it is running.
what is the best way to do that? do i have to use threading or is there
some simpler way?
here's some code to show the structure of the problem:
from time import *
b = 44
def printStuff(a):
print a
sleep(1)
print b
sleep(1)
while 1:
printStuff("bibi")
now how can i make printStuff() print "fifi" instead of "bibi" or 88
instead of 44 once it is running?
thank y'all for your help
do the snake!
robin
--
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module webbrowser - open link in same window - osx
hi,
i'm using the webbrowser module to open url's in safari or firefox.
specifically i'm using the
webbrowser.open('http://...', new=0)
command.
however, even though i say new=0 my url is always opened in a new
browser window.
what can i do, so my link is opened in an already open browser window?
thank you for your help,
robin
--
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webbrowser module bug on os x?
hi
it seems to me like the webbrowser command
webbrowser.open('http://www...', new=0)
does not work as advertised: all the urls open in seperate windows
regardless of the default browser (safari, firefox, mozilla). i do not
have this problem on windows...
can anyone help?
thank you in advance.
robin
--
http://mail.python.org/mailman/listinfo/python-list
best way to serve wsgi with multiple processes
Hi, I am building some computational web services using soaplib. This creates a WSGI application. However, since some of these services are computationally intensive, and may be long running, I was looking for a way to use multiple processes. I thought about using multiprocessing.Process manually in the service, but I was a bit worried about how that might interact with a threaded server (I was hoping the thread serving that request could just wait until the child is finished). Also it would be good to keep the services as simple as possible so it's easier for people to write them. I have at the moment the following WSGI structure: TransLogger(URLMap(URLParser(soaplib objects))) although presumably, due to the beauty of WSGI, this shouldn't matter. As I've found with all web-related Python stuff, I'm overwhelmed by the choice and number of alternatives. I've so far been using cherrypy and ajp-wsgi for my testing, but am aware of Spawning, twisted etc. What would be the simplest [quickest to setup and fewest details of the server required - ideally with a simple example] and most reliable [this will eventually be 'in production' as part of a large scientific project] way to host this sort of WSGI with a process-per-request style? Thanks! Robin -- http://mail.python.org/mailman/listinfo/python-list
Re: best way to serve wsgi with multiple processes
On Feb 11, 12:10 pm, Robin Becker wrote: > We've used forked fastcgi (flup) with success as that decouples the wsgi > process > (in our case django) from the main server (in our case apache). Our reasons > for > doing that were to allow the backend to use modern pythons without having to > upgrade the server (which is required if using say mod_python). The wsgi > process > runs as an ordinary user which eases some tasks. Yes - I've done something very similar with ajp-wsgi (from the author of flup; and which incidently performs very well works really nicely) to go from apache -> wsgi. But the issue I'm asking about here is to have multiple WSGI processes - ie to allow concurrent execution of more than one web service at the time (since these are long running computational soap web services). ajp-wsgi embeds a single python interpreter so multiple running services would be effected by the GIL - I imagine flup is similar (a single process on the python side). So I'm not worried about decoupling from the web server - I'm happy to use pure python server (which I guess is easier to setup) - but I want the web server to dispatch requests to different processes running the wsgi app. I've looked at Spawning, but couldn't get it to work and it seems a little bit 'beta' for my taste (doesn't exit cleanly, leaves worker processes running etc.) Cheers Robin -- http://mail.python.org/mailman/listinfo/python-list
Re: best way to serve wsgi with multiple processes
On Feb 11, 1:28 pm, Robin wrote: > On Feb 11, 12:10 pm, Robin Becker wrote: > > > We've used forked fastcgi (flup) with success as that decouples the wsgi > > process > > (in our case django) from the main server (in our case apache). Our reasons > > for > > doing that were to allow the backend to use modern pythons without having to > > upgrade the server (which is required if using say mod_python). The wsgi > > process > > runs as an ordinary user which eases some tasks. I'm sorry - I originally missed the worked 'forked' and hence the whole point of your message I think. I looked at flup before but had forgotten about the forked version. Having revisited it I think the forked version does keep a process pool so each request is processed by a seperate process, which is exactly what I wanted. Cheers Robin -- http://mail.python.org/mailman/listinfo/python-list
Re: best way to serve wsgi with multiple processes
On Feb 11, 3:46 pm, Robin Becker wrote: > well the flup server for fast cgi supports forking if the server is declared > as > an external process in apache. Then the top level of the flup process handles > each request and passes it off to a forked worker. I cannot recall exactly, > but > I believe that apache mod_fastcgi does the right thing when it comes to > internally declared fastcgi handlers. For apache at least I think the > threading > issues are handled properly. > > I think the preforkserver.py code handles all the threading issues for you > (assuming it's not win32). Thanks - I think if I go the flup route I would use AJP though - since its very easy to setup with apache (1 proxy line) and mod_ajp comes as standard. And then everything is very much seperated from the apache process. -- http://mail.python.org/mailman/listinfo/python-list
Re: SOAP client
On Feb 11, 3:33 pm, mk wrote: > Hi, > > I'm trying to consume a SOAP web service using Python. So far I have > found two libraries: SOAPpy and ZSI. Both of them rely on PyXML which > is no longer maintained (and there is no build for 64bit Windows and > the setup.py doesn't seem to know how to build it on Windows). Is > there a live SOAP library for Python? I'm sort of surprised that a > common standard like SOAP is not more actively supported in Python. > I'm probably missing something? > > Thanks, > m For consuming services, I've found suds to be the best client: https://fedorahosted.org/suds/ For creating them, I've been using soaplib: http://trac.optio.webfactional.com/ HTH, Robin -- http://mail.python.org/mailman/listinfo/python-list
Re: best way to serve wsgi with multiple processes
On Feb 11, 7:59 pm, Graham Dumpleton wrote: > On Feb 11, 8:50 pm, Robin wrote: > > > > > Hi, > > > I am building some computational web services using soaplib. This > > creates a WSGI application. > > > However, since some of these services are computationally intensive, > > and may be long running, I was looking for a way to use multiple > > processes. I thought about using multiprocessing.Process manually in > > the service, but I was a bit worried about how that might interact > > with a threaded server (I was hoping the thread serving that request > > could just wait until the child is finished). Also it would be good to > > keep the services as simple as possible so it's easier for people to > > write them. > > > I have at the moment the following WSGI structure: > > TransLogger(URLMap(URLParser(soaplib objects))) > > although presumably, due to the beauty of WSGI, this shouldn't matter. > > > As I've found with all web-related Python stuff, I'm overwhelmed by > > the choice and number of alternatives. I've so far been using cherrypy > > and ajp-wsgi for my testing, but am aware of Spawning, twisted etc. > > What would be the simplest [quickest to setup and fewest details of > > the server required - ideally with a simple example] and most reliable > > [this will eventually be 'in production' as part of a large scientific > > project] way to host this sort of WSGI with a process-per-request > > style? > > In this sort of situation one wouldn't normally do the work in the > main web server, but have a separarte long running daemon process > embedding mini web server that understands XML-RPC. The main web > server would then make XML-RPC requests against the backend daemon > process, which would use threading and or queueing to handle the > requests. > > If the work is indeed long running, the backend process would normally > just acknowledge the request and not wait. The web page would return > and it would be up to user to then somehow occassionally poll web > server, manually or by AJAX, to see how progres is going. That is, > further XML-RPC requests from main server to backend daemon process > asking about progress. > > I do't believe the suggestions about fastcgi/scgi/ajp/flup or mod_wsgi > are really appropriate as you don't want this done in web server > processes as then you are at mercy of web server processes being > killed or dying when part way through something. Some of these systems > will do this if requests take too long. Thus better to offload real > work to another process. Thanks - in this case I am contrained to use SOAP (I am providing SOAP services using soaplib so they run as a WSGI app). I choose soaplib becuase it seems the simplest way to get soap services running in Python (I was hoping to get this setup quickly). So I am not really able to get into anything more complex as you suggest... I have my nice easy WSGI app soap service, I would just like it to run in a process pool to avoid GIL. Turns out I can do that with apache+mod_wsgi and daemon mode, or flup forked server (I would probably use ajp - so flup is in a seperate process to apache and listens on some local port, and apache proxies to that using the ajp protocol). I'm not sure which one is best... for now I'm continuing to just develop on cherrypy on my own machine. I suspect I will use ajp forked flup, since that only requires mod_proxy and mod_proxy_ajp which I understand come with standard apache and the system administrators will probably be happier with. Cheers Robin -- http://mail.python.org/mailman/listinfo/python-list
Re: best way to serve wsgi with multiple processes
On Feb 11, 9:32 pm, Graham Dumpleton wrote: > 2009/2/12 alex goretoy : > > > GAE (Google App Engine) uses WSGI for webapps. You don't have to overhead of > > managing a server and all it's services this way as well. Just manage dns > > entries. Although, there are limitations depending on your project needs of > > what libs you need to use. > > GAE is not suitable as they kill off any requests that take more than > a set time. That time isn't that long, so can't support long running > requests. GAE is definitely not suitable in this case... The servers are provided and maintained as part of a large scientific project for which I am providing just a few services... Other groups are running services in other platforms on tomcat through soaplab/instantsoap - but I was hoping to use native python services since I thought it would be easier. Cheers Robin -- http://mail.python.org/mailman/listinfo/python-list
About upgrade my graphics memory
PROBLEM i need to upgrade my graphics memory to enjoy the features of windows vista aero theme.. i am intel D915GLVG motherboard. what type of graphics card is supported on my motherboard and how much it cost?? fiend solution here http://pc-solution4u.blogspot.com/ -- http://mail.python.org/mailman/listinfo/python-list
Error code MP170
PROBLEM hi i'm Pauline Revelli'v just brought a canon pixma mp180/mp160. i have installed the software and everything. the printer works fine but the scanner dose not. it trys to scan but a thing comes up that says its not plug in or cable not connected with numbers. the canon is pluged in of cours becasue the printer works. find solution here http://pc-solution4u.blogspot.com/search/label/Canon%20PIXMA%20MP160%20All-In-One%20InkJet%20Printer -- http://mail.python.org/mailman/listinfo/python-list
Ink level monitor on Canon Prixma...
After the ink cartridge for the Canon Prixma MP 160 have been refilled and test then I press the button Stop / Reset several times but unfortunately the problem low ink indicator is still remaining as before although I have done as some user online suggested. Please tell me what to do the correct steps to resolve this issue. find solution here http://pc-solution4u.blogspot.com/search/label/Canon%20PIXMA%20MP160%20All-In-One%20InkJet%20Printer -- http://mail.python.org/mailman/listinfo/python-list
I can't get the scanner to work on my mp160.
PROBLEM I have tried everything but I am unable to get the scanner to work . I have reinstalled drivers checked connections I have windows 2000 and all other requirements. There is a windows error code 31 that pops up. This says check connections and make sure scanner is turned on. find solution here http://pc-solution4u.blogspot.com/search/label/Canon%20PIXMA%20MP160%20All-In-One%20InkJet%20Printer -- http://mail.python.org/mailman/listinfo/python-list
sceanner connection to the pc
PROBLEM i have already installed the software canon mp 160..the machine can print out the paper andn copy something perfectly..BUT, when i tried to scan a paper to the PC,It can't work..there's is a message 'CANNOT COMMUNICATE TO THE SCANNER. PLEASE TURN ON OR CONNECT THE MACHINE' whereas i have turned it on..is there any body wants to help me with this problem?? find solution here http://pc-solution4u.blogspot.com/search/label/Canon%20PIXMA%20MP160%20All-In-One%20InkJet%20Printer -- http://mail.python.org/mailman/listinfo/python-list
Scanning error
PROBLEM I connect to my laptop to scan pictures, and each time, each single time the scanner will start scanning an inch but it stops and I get the message Cannot communicate with scanner. Cable may be disconnected or scanner may be turned off. Check status. Scanner driver will be closed. Code: 2,155,0"The closest I get is it will scan one or two, but same problem persists. Today I totally cannot scan one thing! What is wrong? find solution here http://pc-solution4u.blogspot.com/search/label/Canon%20PIXMA%20MP160%20All-In-One%20InkJet%20Printer -- http://mail.python.org/mailman/listinfo/python-list
Canon mp160 drivers
PROBLEM i lost my canon mp160 drivers for the printer and scanner. how to i download from the drivers for the printerI lost my start up disk for my canon mp180 all in one printer.How can I download another oneNeed to find the drivers to downloadmy computer has much viruses and i installed it. after finishedinstalling, i cannot print more because the software is lost visit in this sitehttp://www.usa.canon.com/consumer/controller?act=DownloadDetailAct&fcategoryid=238&modelid=13368 MP160 driver 1.01 Win98SE/ME/2000/XPhttp://www.driversdown.com/drivers/ Canon-PIXMA-MP160-driver_74508.shtmlMP160 driver 1.10 Windows Vista/ Vista-64http://www.driversdown.com/drivers/Canon-PIXMA-MP160- driver_74507.shtml -- http://mail.python.org/mailman/listinfo/python-list
Canon PIXMA MP160 All-In-One InkJet Printer
PROBLEM I have a very basic question... how to take black and white print? I am getting colored print even if I press black button on the printer. Please advice.I'll be thankful if you please let me know the steps to make sure that how can I make sure that my printer settings at computer level are correct to take black and print. find solution here http://pc-solution4u.blogspot.com/search/label/Canon%20PIXMA%20MP160%20All-In-One%20InkJet%20Printer -- http://mail.python.org/mailman/listinfo/python-list
E5 and 2,114,0 errors
PROBLEM I've just bought a second hand MP160,which I only intended to used as a scanner.I can't get the scanner to operate due to an E5 error on the display,and a 2,114,0 error which appears as a pop-up when I attempt to scan.Although empty,the cartridges are of the correct type and are seated properly.When I remove the cartridges completely the error codes do not change.Is an empty cartridge enough to cause this issue? find solution here http://pc-solution4u.blogspot.com/search/label/Canon%20PIXMA%20MP160%20All-In-One%20InkJet%20Printer -- http://mail.python.org/mailman/listinfo/python-list
ink level reset
PROBLEM I need to know how to reset the ink level counter of the Canon MP160. It says " Low ink" when I just refilled the ink tanks. Please help. I need the tricks or software that resets the counter. find solution here http://pc-solution4u.blogspot.com/search/label/Canon%20PIXMA%20MP160%20All-In-One%20InkJet%20Printer -- http://mail.python.org/mailman/listinfo/python-list
Re: New python.org website
"Michael Tobis" <[EMAIL PROTECTED]> wrote: >While the new one is much better than the old website, the logo strikes >me as awful. I personally believe the new logo is miles better than the old one. Whether you see snakes or a plus-sign or a yin-yang, it has a nice harmonious look that still captures some playfulness. Besides, why is everyone fixated on snakes? Python the language has nothing to do with python the constrictor. As far as the layout goes, I still find it too busy. Specifically there are too many fonts on the one page. But I have already made that point, and did an entire version of the homepage, which the team have taken as input. Anyone who has the time can do the same, rather than simply comment from the sidelines. The best websites never stay still, but are constantly evolving. I hope python.org can do the same, and go from strength to strength. Congratulations to all involved! - robin noisetheatre.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
New Python Logo Revealed
I have an entry on my blog discussing the new Python logo, which is apparently due to replace the current one within the month. I'd be interested in what people think of it. Surf: http://diagrammes-modernes.blogspot.com - robin noisetheatre.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: New Python Logo Revealed
"Giovanni Bajo" <[EMAIL PROTECTED]> wrote: >robin wrote: > >> I have an entry on my blog discussing the new Python logo, which is >> apparently due to replace the current one within the month. I'd be >> interested in what people think of it. >> >> Surf: >> http://diagrammes-modernes.blogspot.com > >Tell me tell me it's an april's joke, please? :) yes :-) - robin noisetheatre.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
converting lists to strings to lists
hi, i'm doing some udp stuff and receive strings of the form '0.87 0.25 0.79;\n' what i'd need though is a list of the form [0.87 0.25 0.79] i got to the [0:-3] part to obtain a string '0.87 0.25 0.79' but i can't find a way to convert this into a list. i tried eval() but this gives me the following error: Traceback (most recent call last): File "", line 1, in ? File "", line 1 .87 0.25 0.79000 and i have the same problem the other way round. e.g. i have a list which i need to convert to a string in order to send it via udp. btw: i cannot use pickle, since i'm sending stuff to a LISP programme. thank you in advance for your help! best, robin -- http://mail.python.org/mailman/listinfo/python-list
Re: converting lists to strings to lists
thanks for your answer. split gives me a list of strings, but i found a way to do what i want: input='0.1, 0.2, 0.3;\n' input = list(eval(input[0:-2])) print input > [0.10001, 0.20001, 0.2] this does fine... but now, how do i convert this list to a string? my_new_string = ' '.join(input) gives me: Traceback (most recent call last): File "", line 1, in ? TypeError: sequence item 0: expected string, float found thanks, robin -- http://mail.python.org/mailman/listinfo/python-list
Re: converting lists to strings to lists
yo! thank you everone! here's how i finally did it: converting the string into a list: input = net.receiveUDPData() input = list(eval(input[0:-2])) converting the list into a string: sendout = "%.6f %.6f %.6f;\n" % tuple(winningvector) maybe i'll even find a way to generalize the list2string bit, so it accepts arbitrary sized lists... thanks, robin -- http://mail.python.org/mailman/listinfo/python-list
Re: bus error in Py_Finalize with ctypes imported
On Nov 13, 2:14 pm, Robin wrote: > I am trying to embed Python in a MATLAB mex function. This is loaded > into the MATLAB interpreter - I would like the Python interpreter to > be initialized once and stay there for future calls. I added a call to > Py_Finalize as a mexAtExit handler which is called when the library is > unloaded in MATLAB (with clear funcname) or when MATLAB shuts down. So > far, things were working well, but I get a random but easily > repeatable bus error in Py_Finalize if I have imported ctypes. Looks like I've run into this bug: http://bugs.python.org/issue6869 I will try the attached patch - hopefully it will make into a forthcoming release. Cheers Robin -- http://mail.python.org/mailman/listinfo/python-list
bus error in Py_Finalize with ctypes imported
Hi,
I am trying to embed Python in a MATLAB mex function. This is loaded
into the MATLAB interpreter - I would like the Python interpreter to
be initialized once and stay there for future calls. I added a call to
Py_Finalize as a mexAtExit handler which is called when the library is
unloaded in MATLAB (with clear funcname) or when MATLAB shuts down. So
far, things were working well, but I get a random but easily
repeatable bus error in Py_Finalize if I have imported ctypes.
Here is my code:
#include
#include
static int PYRUNNING = 0;
static void Cleanup(void)
{
mexPrintf("Finalising Python...\n");
Py_Finalize();
}
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const
mxArray*prhs[])
{
mexPrintf("hello from mex\n");
if (!PYRUNNING) {
Py_Initialize();
PYRUNNING = 1;
mexAtExit(Cleanup);
PyRun_SimpleString("import ctypes");
}
PyRun_SimpleString("print 'hello from python'");
}
If I load, run the function, and unload many times eventually I get
the following stack trace (whcih i don't get if I'm not import
ctypes). Does anyone have any idea what might be up? Could it be a bug
in Py_Finalize or ctypes? Is there a problem with my approach (ie is
it bad to leave the interpreter initialized between mex function calls
- it seems to work provided ctypes is not imported - but I need ctypes
to access other mex functions from python).
Bus error detected at Fri Nov 13 14:06:12 2009
Configuration:
MATLAB Version: 7.8.0.347 (R2009a)
MATLAB License: 161051
Operating System: Darwin 10.0.0 Darwin Kernel Version 10.0.0: Fri
Jul 31 22:47:34 PDT 2009; root:xnu-1456.1.25~1/RELEASE_I386 i386
Window System:The X.Org Foundation (10402000), display /tmp/
launch-2p1ZWg/:0
Current Visual: 0x24 (class 4, depth 24)
Processor ID: x86 Family 6 Model 15 Stepping 10, GenuineIntel
Virtual Machine: Java 1.6.0_15-b03-219 with Apple Inc. Java HotSpot
(TM) Client VM mixed mode
Default Encoding: ISO-8859-1
Fault Count: 1
Register State:
eax = ebx = 3483d9be
ecx = 33ff7620 edx =
esi = 32fb4dc0 edi = 001a
ebp = b0b69938 esp = b0b69920
eip = 3485559f flg = 00010282
Stack Trace:
[0] Python:type_dealloc~(0x32fb4dc0, 0x33f70818, 0x34854f0b,
0x34844410) + 26 bytes
[1] Python:dict_dealloc~(0x33fef930, 0x348e4b40 "__builtin__",
0xb0b699bc, 0xb0b699b8) + 142 bytes
[2] Python:dict_dealloc~(0x33f429c0, 0x348ee58c "exitfunc",
0xb0b699d8, 0x348b96b0) + 142 bytes
[3] Python:_PyImport_Fini~(0x348ee58c "exitfunc", 0, 0, 0) + 82
bytes
[4] Python:Py_Finalize~(673024, 1, 0, 0x00ab4700) + 207 bytes
[5] libmex.dylib:SafeExitFunctionCall(void (*)())(0x30365df0,
0xb0b69ab8, 0xb0b69a80, 0x0073d01b) + 66 bytes
[6] libmex.dylib:mexClearMexFileDefault(impl_info_tag*)(0x33e0dce0,
1, 0, 0x015fa3d8 "7Mfh_mex") + 80 bytes
[7] libmex.dylib:safeMexClearMexFile(impl_info_tag*&)(0xb0b69bec
"‡‹‡3", 1, 0x015fc080, 0) + 76 bytes
[8] libmex.dylib:Mlm_mex::unload_file()(0x32b01290, 0, 0, 0) + 250
bytes
[9] libmwm_dispatcher.dylib:Mlm_file::unload_mf()(0x32b01290, 0, 0,
0) + 18 bytes
[10] libmwm_dispatcher.dylib:Mlm_MATLAB_fn::clear()(0x32b01290, 0,
0xb0b69c9c, 236) + 82 bytes
[11] libmwm_dispatcher.dylib:void clear
(Mlmmf_string_matcher, int)(0x05319c00, 0x33e24b8c "pytest",
0x30476300, 0x03f3b531 "pytest") + 296 bytes
[12] libmwm_dispatcher.dylib:mdClearFunctionsByName(0x33e24b8c
"pytest", 42, 0xb0b6adf8, 10) + 650 bytes
[13] libmwm_interpreter.dylib:InterpBridge::FullClearFcn(int,
mxArray_tag**, int, mxArray_tag**)(0x036225e0, 0, 0xb0b6af6c, 1) +
1234 bytes
[14] libmwm_interpreter.dylib:inFullClearFcn(int, mxArray_tag**,
int, mxArray_tag**)(0, 0xb0b6af6c, 1, 0xb0b6afcc) + 50 bytes
[15] libmwm_dispatcher.dylib:Mfh_builtin::dispatch_mf(int,
mxArray_tag**, int, mxArray_tag**)(0x2dd025a0, 0, 0xb0b6af6c, 1) + 95
bytes
[16] libmwm_dispatcher.dylib:Mfh_MATLAB_fn::dispatch_fh(int,
mxArray_tag**, int, mxArray_tag**)(0x2dd025a0, 0, 0xb0b6af6c, 1) + 192
bytes
[17] libmwm_interpreter.dylib:inDispatchFromStack(int, char const*,
int, int)(0, 0x304fa51c "clear", 0, 1) + 998 bytes
[18] libmwm_interpreter.dylib:inDispatchCall(char const*, int, int,
int, int*, int*)(1, 0xb0b6b298, 0x33e11a28, 0x9322e76b) + 152 bytes
[19] libmwm_interpreter.dylib:inInterp(inDebugCheck, int, int,
opcodes, inPcodeNest_tag volatile*, int*)(1, 0, 1, 0) + 5167 bytes
[20] libmwm_interpreter.dylib:protected_inInterp(inDebugCheck, int,
int, opcodes, inPcodeNest_tag*, int*)(1, 0, 1, 0) + 112 bytes
[21] libmwm_interpreter.dylib:inInterPcodeSJ(inDebugCheck, int, int,
opcodes, inPcodeNest_tag*, int*)(0, 0x33e007d0, 0xb0b6b460,
0xb0b6b460) + 266 bytes
[22] libmwm_interpreter.dylib:inExecuteMFunctionOrScript(Mfh_mp*,
bool)(0x33e263c0, 1, 0xb0b6b99c, 0) + 932 bytes
[23] libmwm_interpreter
python to exe
Does anyone know of a good python to stand alone exe compiler? Thanks, -Robin -- http://mail.python.org/mailman/listinfo/python-list
python question
how do you acccess a hash element in python 3? It completely changed from version 2 and earlier, I think. stop war straight up, direct or indectly, -- http://mail.python.org/mailman/listinfo/python-list
repeat tkinter
How can I make a command within a tkinter application repeat itself over and over in intervals of a certain time. Thanks, -Robin -- http://mail.python.org/mailman/listinfo/python-list
scrolledtext download location
Does anyone know where I can download the ScrolledText tkintewr widget, looked all over for it and had no luck, Thanks, -Robin -- http://mail.python.org/mailman/listinfo/python-list
the solution to your current problems........join this: http://www.thevoid1.net/para
the solution to your current problemsjoin this: http://www.thevoid1.net/para -- http://mail.python.org/mailman/listinfo/python-list
python to exe
Does anyone know of a way I can make a python script into an exe that runs on windows7, I don't care if it is a python to c++ or python to c translator or anything like it. The version of python I am using is python 3.1. Thanks, -Robin -- http://mail.python.org/mailman/listinfo/python-list
what are some good python modules?
What are some good python modules that can be downloaded for any purpose that is recomended? -Robin -- http://mail.python.org/mailman/listinfo/python-list
do
please, please post a link to my site, http://offlame.thevoid1.net/ also, post free for all links at www.thevoid1.net/ffa -Robin -- http://mail.python.org/mailman/listinfo/python-list
Re: Numeric literals in other than base 10
"James Harris" wrote in message news:bc3607b3-7fdd-43fd-8ede-66ac3f597...@32g2000yqj.googlegroups.com... On 22 Aug, 10:27, David <71da...@libero.it> wrote: >They look good - which is important. The trouble (for me) is that I >want the notation for a new programming language and already use these >characters. I have underscore as an optional separator for groups of >digits - 123000 and 123_000 mean the same. The semicolon terminates a >statement. Based on your second idea, though, maybe a colon could be >used instead as in XPL uses "(2)1011" for base 4, "(3)03212" for octal, "(4)0741" for base 16. PL/I uses 8FXN for numeric hex and X suffix for a hex character constant. -- http://mail.python.org/mailman/listinfo/python-list
unexpected syntax errors
A user is getting this error New issue 8: bad raise syntax https://bitbucket.org/rptlab/reportlab/issue/8/bad-raise-syntax File "/usr/lib/python2.7/site-packages/svg2rlg.py", line 16, in from reportlab.graphics import renderPDF File "/usr/lib64/python2.7/site-packages/reportlab/graphics/renderPDF.py", line 168 raise ValueError, 'bad value for textAnchor '+str(text_anchor) ^ SyntaxError: invalid syntax however, I believe that this older syntax is allowed in python 2.7. We've had other issues like this raised from various distros which are apparently making changes to 2.7 which change the external behaviour eg spelling corrections to attribute names. Could this be one of those? -- Robin Becker -- http://mail.python.org/mailman/listinfo/python-list
Re: Writing Extensions for Python 3 in C
On 18/06/2013 11:24, Aditya Avinash wrote: Hi. This is the last place where I want to ask a question. I have searched for lots of tutorials and documentation on the web but, didn't find a decent one to develop extensions for Python 3 using a custom compiler (mingw32, nvcc). Please help me. PS: Don't point me to Python Documentation. It is not good for beginners. It doesn't elaborate about calls and implementation. Try getting the source code for the Python you intend to build for. Then look in the Modules directory for the sample extensions xxlimited.c, xxmodule.c & xxsubtype.c. They may give you some idea of how to proceed. Of course all the other .c codes in there are the actual extensions that Python uses so they are also good examples. I started with "Extending and Embedding the Python Interpreter" from the python documentation though. -- Robin Becker -- http://mail.python.org/mailman/listinfo/python-list
substituting proxy
Before attempting to reinvent the wheel has anyone created an http(s) proxy that can replace the content for specific requests. Context: I have access to the client's test site, but a lot of the requests are dynamic and save html complete etc etc doesn't work properly. In addition lots of the content comes from a cloud server which seems to object unless I take great care over spoofing of host names & referrers etc. I would like to debug stuff we supply, but that's hard unless I have the whole kit & kaboodle. I thought a proxy that could substitute for our javascript file(s) might work. Has anyone done this in twisted pymiproxy etc etc? -- Robin Becker -- http://mail.python.org/mailman/listinfo/python-list
Executing untrusted scripts in a sandboxed environment
Hi all, I need to execute untrusted scripts in my Python application. To avoid security issues, I want to use a sandboxed environment. This means that the script authors have no access to the file system. They may only access objects, modules and classes that are "flagged" or "approved" for scripting. I read that I will not be able to do this with Python scripts. (See SandboxedPython page in the Python wiki [0] and several SE.com questions, e. g. [1].) So my question is: What is the best way to "embed" a script engine in a sandboxed environment that has access to the Python modules and classes that I provide? Thanks for your help. Best regards, Robin [0] http://wiki.python.org/moin/SandboxedPython [1] http://stackoverflow.com/questions/3068139/how-can-i-sandbox-python-in-pure-python -- http://mail.python.org/mailman/listinfo/python-list
looping versus comprehension
An email in reportlab-us...@reportlab.com claimed that the following loop in a charting module was taking a long time I use ReportLab 2.6 but I also found the problem in ReportLab daily from 01/29/2013 in /src/reportlab/graphics/charts/lineplots.py: 276 # Iterate over data columns. 277 if self.joinedLines: 278 points = [] 279 for xy in row: 280 points += [xy[0], xy[1]] If I use a list comprehension instead, the plot is generated within seconds or minutes: 278 points = [[xy[0], xy[1]] for xy in row] however, when I tried an experiment in python 2.7 using the script below I find that the looping algorithms perform better. A naive loop using list += list would appear to be an O(n**2) operation, but python seems to be doing better than that. Also why does the append version fail so dismally. Is my test coded wrongly or is pre-allocation of the list making this better than expected? C:\code\tests>tpoints 86000 86 START n=86000 existing algorithm took 0.08 seconds existing algorithm using list took 0.12 seconds existing algorithm using list assuming length 2 took 0.12 seconds map(list,row) took 0.16 seconds [list(xy) for xy in row] took 0.28 seconds [[xy[0],xy[1]] for xy in row] took 0.22 seconds append algorithm took 0.19 seconds END n=86000 START n=86 existing algorithm took 0.86 seconds existing algorithm using list took 1.33 seconds existing algorithm using list assuming length 2 took 1.25 seconds map(list,row) took 3.44 seconds [list(xy) for xy in row] took 3.03 seconds [[xy[0],xy[1]] for xy in row] took 2.70 seconds append algorithm took 2.48 seconds END n=86 # import sys, time def main(n): print 20*'#','START n=%s'%n,20*'#' row = [(i,i+1) for i in xrange(2*n)] print 'existing algorithm', t0 = time.time() points = [] for xy in row: points += [xy[0],xy[1]] t1 = time.time() print 'took %.2f seconds' % (t1-t0) print 'existing algorithm using list', t0 = time.time() points = [] for xy in row: points += list(xy[:2]) t1 = time.time() print 'took %.2f seconds' % (t1-t0) print 'existing algorithm using list assuming length 2', t0 = time.time() points = [] for xy in row: points += list(xy) t1 = time.time() print 'took %.2f seconds' % (t1-t0) print 'map(list,row)', t0 = time.time() points = map(list,row) t1 = time.time() print 'took %.2f seconds' % (t1-t0) print '[list(xy) for xy in row]', t0 = time.time() points = [list(xy) for xy in row] t1 = time.time() print 'took %.2f seconds' % (t1-t0) print '[[xy[0],xy[1]] for xy in row]', t0 = time.time() points = [[xy[0],xy[1]] for xy in row] t1 = time.time() print 'took %.2f seconds' % (t1-t0) print 'append algorithm', t0 = time.time() points = [].append for xy in row: points([xy[0],xy[1]]) points = points.__self__ t1 = time.time() print 'took %.2f seconds' % (t1-t0) print 20*'#','END n=%s'%n,20*'#','\n\n' if __name__=='__main__': if len(sys.argv)==1: N = [86000] else: N = map(int,sys.argv[1:]) for n in N: main(n) # -- Robin Becker -- http://mail.python.org/mailman/listinfo/python-list
Re: looping versus comprehension
On 30/01/2013 15:49, Chris Angelico wrote: On Thu, Jan 31, 2013 at 1:58 AM, Robin Becker wrote: however, when I tried an experiment in python 2.7 using the script below I find that the looping algorithms perform better. A naive loop using list += list would appear to be an O(n**2) operation, but python seems to be doing better than that. Also why does the append version fail so dismally. Is my test coded wrongly or is pre-allocation of the list making this better than expected? First off, are you aware that your first three blocks of code and your last four produce different results? The first ones flatten the list, the others simply convert tuples to lists. With n = 3: points = [] for xy in row: points += [xy[0],xy[1]] points [0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6] map(list,row) [[0, 1], [1, 2], [2, 3], [3, 4], [4, 5], [5, 6]] Once that's sorted out, then timings can be played with. But it's worth noting that list appending is not going to be O(N*N), because it's going to allow room for expansion. ChrisA No I missed that :( the list is a flattened one. That'll teach me not to copy the code from the users without checking. Now you point it out it's clear that his code is doing something different. Presumably it's not drawing the same thing at all :) no wonder it got much faster. -- Robin Becker -- http://mail.python.org/mailman/listinfo/python-list
client ssl verification
I'm trying to do client ssl verification with code that looks like the sample
below. I am able to reach and read urls that are secure and have no client
certificate requirement OK. If I set explicit_check to True then verbose output
indicates that the server certs are being checked fine ie I see the correct cert
details and am able to check them.
However, when I try to reach an apache location like
sslverifyclient require
sslverifydepth 10
I am getting an error from urllib2 that goes like this
urllib2.py", line 1148, in do_open
raise URLError(err)
URLError: routines:SSL3_READ_BYTES:tlsv1 alert unknown ca
I am using the server.crt and server.key (both in PEM format) from the target
server itself; I reasoned that should be the easiest combo for the client &
server to match, but I am obviously wrong. Any obvious stupidities to be pointed
out? I suppose I could create a new cert/key based on a self signed ca, but that
would not work properly for the other parts of the server.
import socket, ssl, fnmatch, datetime, urllib2, httplib
verbose=False
# wraps https connections with ssl certificate verification
class SecuredHTTPSHandler(urllib2.HTTPSHandler):
def
__init__(self,key_file=None,cert_file=None,ca_certs=None,explicit_check=False):
class SecuredHTTPSConnection(httplib.HTTPSConnection):
def connect(self):
# overrides the version in httplib so that we do
# certificate verification
sock = socket.create_connection((self.host, self.port), self.timeout)
if self._tunnel_host:
self.sock = sock
self._tunnel()
# wrap the socket using verification with the root
# certs in ca_certs
if verbose:
print ca_certs, key_file, cert_file
self.sock = ssl.wrap_socket(sock,
cert_reqs=ssl.CERT_REQUIRED,
ca_certs=ca_certs,
keyfile=key_file,
certfile=cert_file,
)
if explicit_check:
cert = self.sock.getpeercert()
if verbose:
import pprint
pprint.pprint(cert)
for key,field in cert.iteritems():
if key=='subject':
sd = dict([x[0] for x in field])
certhost = sd.get('commonName')
if not fnmatch.fnmatch(self.host,certhost):
raise ssl.SSLError("Host name '%s' doesn't match certificate host
'%s'"
% (self.host, certhost))
if verbose:
print 'matched "%s" to "%s"' % (self.host,certhost)
elif key=='notAfter':
now = datetime.datetime.now()
crttime = datetime.datetime.strptime(field,'%b %d %H:%M:%S %Y %Z')
if verbose:
print 'crttime=%s now=%s' % (crttime,now)
if now>=crttime:
raise ssl.SSLError("Host '%s' certificate expired on %s"
% (self.host, field))
self.specialized_conn_class = SecuredHTTPSConnection
urllib2.HTTPSHandler.__init__(self)
def https_open(self, req):
return self.do_open(self.specialized_conn_class, req)
def secureDataGet(uri,ca_certs='cacert.pem',key_file=None,cert_file=None,
explicit_check=False):
https_handler = SecuredHTTPSHandler(key_file=key_file,cert_file=cert_file,
ca_certs=ca_certs,explicit_check=explicit_check)
url_opener = urllib2.build_opener(https_handler)
handle = url_opener.open(uri)
response = handle.readlines()
handle.close()
return response
--
Robin Becker
--
http://mail.python.org/mailman/listinfo/python-list
How good is security via hashing
A python web process is producing files that are given randomized names of the form hh-MMDDhhmmss-.pdf where rrr.. is a 128bit random number (encoded as base62). The intent of the random part is to prevent recipients of one file from being able to guess the names of others. The process was originally a cgi script which meant each random number was produced thusly pid is process id, dur is 4 bytes from /dev/urandom. random.seed(long(time.time()*someprimeint)|(pid<<64)|(dur<<32)) rrr = random.getrandbits(128) is this algorithm safe? Is it safe if the process is switched to fastcgi and the initialization is only carried out once and then say 50 rrr values are generated. -- Robin Becker -- http://mail.python.org/mailman/listinfo/python-list
Re: How good is security via hashing
On 07/06/2011 11:26, Nitin Pawar wrote: Have you tried using UUID module? Its pretty handy and comes with base64 encoding function which gives extremely high quality randon strings ref: http://stackoverflow.com/questions/621649/python-and-random-keys-of-21-char-max .. I didn't actually ask for a suitable method for doing this; I assumed that Tim Peters' algorithm (at least I think he's behind most of the python random support) is pretty good so that the bits produced are indeed fairly good approximations to random. I guess what I'm asking is whether any sequence that's using random to generate random numbers is predictable if enough samples are drawn. In this case assuming that fastcgi is being used can I observe a sequence of generated numbers and work out the state of the generator. If that is possible then the sequence becomes deterministic and such a scheme is useless. If I use cgi then we're re-initializing the sequence hopefully using some other unrelated randomness for each number. Uuid apparently uses machine internals etc etc to try and produce randomness, but urandom and similar can block so are probably not entirely suitable. -- Robin Becker -- http://mail.python.org/mailman/listinfo/python-list
Re: How good is security via hashing
/dev/urandom does not block, that's the point of it as compared to / dev/random. Jean-Paul my mistake, I thought it was the other way round, on FreeBSD they're the same anyway which is what we test on. -- Robin Becker -- http://mail.python.org/mailman/listinfo/python-list
Re: How good is security via hashing
On 07/06/2011 12:40, Jean-Paul Calderone wrote: astcgi and the initialization is only carried out once and then say 50 rrr values are generated. How much randomness do you actually have in this scheme? The PID is probably difficult for an attacker to know, but it's allocated roughly monotonically with a known wrap-around value. The time is probably roughly known, so it also contributes less than its full bits to the randomness. Only dur is really unpredictable. So you have something somewhat above 4 bytes of randomness in your seed - perhaps 8 or 10. That's much less than even the fairly small 16 bytes of "randomness" you expose in the filename. I'm sure you're right about the limited amount of entropy in the initial state, but how much state can be in the prng? The random module is entirely deterministic, so once the seed is known the value you produce is known too. Is 10 bytes enough to thwart your attackers? Hard to say, what does an attack look like? An attacker could try to gain information from seeing others' results by guessing the filename. an attack would consist of generating a sample file via a web query which might take 1 or 2 seconds; the sequence number could then be seen and if the state established future filenames could be guessed if fastcgi is in operation. In a cgi type scheme that requires searching over the pid space, the time space and some random bits from the OS. I'm not sure such an attack is realistic given the size of the space even in the initial seed. If you want the full 16 bytes of unpredictability, why don't you just read 16 bytes from /dev/urandom and forget about all the other stuff? Jean-Paul I have a vague memory that the original author felt that entropy might run out or something like that so reading from /dev/urandom always was not a good idea. FreeBSD re-uses the entropy, but the end target is Solaris so I'm not really sure about the details of /dev/urandom. -- Robin Becker -- http://mail.python.org/mailman/listinfo/python-list
Re: How good is security via hashing
On 07/06/2011 21:42, Paul Rubin wrote: geremy condra writes: # adds random junk to the filename- should make it hard to guess rrr = os.urandom(16) fname += base64.b64encode(rrr) Don't use b64 output in a filename -- it can have slashes in it! :-( Simplest is to use old fashioned hexadeimal for stuff like that, unless the number of chars is a significant problem. Go for a more complicated encoding if you must. we have been using base62 ie 0-9A-Za-z just to reduce the name length. -- Robin Becker -- http://mail.python.org/mailman/listinfo/python-list
Re: How to read barcoded value from PDF
On 28/06/2011 06:59, Asif Jamadar wrote:
Hi,
...
In Reportlab I can do the following code to generate barcode and to get the
value of that barcode
barcode=code39.Extended39("123456789",barWidth=0.2*mm,barHeight=8*mm)
bc = Paragraph("Barcode value: %s" % barcode.value, STYLES['Normal'])
document.append(bc)
But how can I achieve this from the existing PDF document??
.
you might consider asking on the reportlab list as there is considerable
experience there about pdf in general.
It's unlikely that you will be able to easily discern which string/text in the
pdf corresponds to the barcode values that you are interested in.
PDF does allow things called annotations which reportlab can generate.
Alternatively you can generate an invisible string which may make more sense
than the simple barcode value. So when you draw the barcode you also need to add
the magic string using some prefix/postfix that allows easy extraction with
pypdf or similar eg
"===radamajfisa===123456789===radamajfisa===". Your text extractor should be
able to find this without too much trouble.
--
Robin Becker
--
http://mail.python.org/mailman/listinfo/python-list
Re: Implicit initialization is EVIL!
On 03/07/2011 23:21, Chris Angelico wrote: . var(0x14205359) x # Don't forget to provide an address where the object will be located x=42 did you forget to specify the memory bank and computer (and presumably planet etc etc) -molly-coddled-ly yrs- Robin Becker -- http://mail.python.org/mailman/listinfo/python-list
Re: Implicit initialization is EVIL!
On 05/07/2011 16:33, nn wrote: .. Ah, I see we have a mainframe programmer among us ... :-) so long since I manipulated the switches of that old pdp-8 -anciently yrs- Robin Becker -- http://mail.python.org/mailman/listinfo/python-list
Re: reportlab import error after dundled using py2exe
On 22/07/2011 03:55, SANKAR . wrote: Hi all, C:\Python26\dist>DELchek.exe Traceback (most recent call last): File "DELchek.py", line 12, in File "reportlab\pdfgen\canvas.pyc", line 25, in< File "reportlab\pdfbase\pdfdoc.pyc", line 22, in File "reportlab\pdfbase\pdfmetrics.pyc", line 23, File "reportlab\pdfbase\_fontdata.pyc", line 158, ImportError: No module named _fontdata_enc_winansi But I could see the '_fontdata_enc_winansi' module in reportlab folder. Could someone help me to fix this. . You can try asking this in the reportlab list reportlab-us...@lists2.reportlab.com but perhaps this is more about py2exe than reportlab. The modules _fontdata_enc_* & _fontdata_widths_* are imported dynamically in _fontdata.py rather than explicitly. I suspect that py2exe needs to be given a hint that this is going on. However, I'm uncertain as to why this should be required since even if the imports are being dynamically imported that is done as soon as _fontdata is imported (ie it's part of the module code) so those modules should be seen by the setup.py. If you don't have reportlab explicitly imported as part of the packages try adding this to the packages list packages=[ 'reportlab', 'reportlab.graphics.charts', 'reportlab.graphics.samples', 'reportlab.graphics.widgets', 'reportlab.graphics.barcode', 'reportlab.graphics', 'reportlab.lib', 'reportlab.pdfbase', 'reportlab.pdfgen', 'reportlab.platypus', ], that's what we use to make the distributions and seems to work. -- Robin Becker -- http://mail.python.org/mailman/listinfo/python-list
Re: arbitrary precision linear algebra
On 02/03/2011 16:39, Ben123 wrote: ... Languages can't support infinitely large or small numbers, so try to multiply the inner variables by 10^n to increase their values if this will not involve on the method. For example, I did this when was calculating geometric means of computer benchmarks. Currently I have values between 1 and 1E-300 (not infinitely small). I don't see how scaling by powers of 10 will increase precision. In such way you will be storing the number of zeros as n. Are you saying python cares whether I express a number as 0.001 or scaled by 10^5 to read 100? If this is the case, I'm still stuck. I need the full range of eigenvalues from 1 to 1E-300, so the entire range could be scaled by 1E300 but I would still need better precision than 1E19 ... If you enter a number as 1e-19 then python will treat as a float; by default I think that float is IEEE double precision so you're getting a 48 bit mantissa (others may have better details). That means you've already lost any idea of arbitrary precision. When you say you have numbers like 1E-300 are those actually numerically zero or have you some valid inputs that vary over a huge range. It should be possible to compute determinants/inverses etc to arbitrary precision as those are known to be polynomial functions of the input elements. However, eigenvalues are not. eg [0 2] [1 0] has eigenvalues +/- sqrt(2) so even though you can represent the matrix in finite precision the eigenvalues require infinite precision. Eigenvalues are roots of a polynomial in the elements and root solving may require an infinite number of steps so it will be difficult with arbitrary matrices to keep arbitrary precision. -- Robin Becker -- http://mail.python.org/mailman/listinfo/python-list
Re: Generate PDF with Tamil font problem
On 05/03/2011 05:20, sathe...@e-ndicus.com wrote: Hi All, I am using python's reportlab to print some unicode Tamil characters 'பே'. I added necessary unicode font to reportlab. But It prints the output as 'ேப' (in reverse order). This issue happens for multi-byte characters, whereas for character 'ப' is printed as it is. I am struggling to figure out the issue. Any help would see me on track. ... you can ask at the reportlab mailing list reportlab-us...@reportlab.com; the use of numeric entities is supported in paragraph text, but not in canvas.drawString and similar. There you need to use either unicode or a utf8 encoded byte string. -- Robin Becker -- http://mail.python.org/mailman/listinfo/python-list
full reload of fastcgi
A recent problem with a fastcgi script leads me to ask if there's any well defined way to fully reload a python fastcgi process. I know that people do tricks like unloading/reloading all modules, but it seems there's no obvious way to get python to restart itself. I believe that the server is apache based with mod_fcgid. The script in question suffers from two problems 1) it runs out of a zip file and the software can be upgraded by moving a new zip file into place. 2) A cron job pulls new data into place which the script should notice. The last is easy we can just re-read the data files before acting on the request, but it seems much harder to reload all modules from the zipfile. An easy way out is to just halt the running script when a software change is detected. That means we must run with the old software for at least one request and could be dangerous if an import is required during the last request. Normally the upgrade process is supposed to move software into place and then new data and then restart the fastcgi scripts; for whatever reason the error seems to have been that the process was restarted with old data around. Any ideas? -- Robin Becker -- http://mail.python.org/mailman/listinfo/python-list
ANNOUNCE: wxPython 2.8.12.0
Announcing -- The 2.8.12.0 release of wxPython is now available for download at http://wxpython.org/download.php. This release has no major new features or enhancements, but there have been plenty of bug fixes since the last stable release. Source code is available as a tarball, and binaries are also available for Python 2.6 and 2.7, for Windows and Mac, as well some packages for various Linux distributions in the wx apt repository. Binaries for Python 2.5 have been discontinued. What is wxPython? - wxPython is a GUI toolkit for the Python programming language. It allows Python programmers to create programs with a robust, highly functional graphical user interface, simply and easily. It is implemented as a Python extension module that wraps the GUI components of the popular wxWidgets cross platform library, which is written in C++. wxPython is a cross-platform toolkit. This means that the same program will usually run on multiple platforms without modifications. Currently supported platforms are 32-bit and 64-bit Microsoft Windows, most Linux or other Unix-like systems using GTK2, and Mac OS X 10.4+. In most cases the native widgets are used on each platform to provide a 100% native look and feel for the application. -- Robin Dunn Software Craftsman http://wxPython.org -- http://mail.python.org/mailman/listinfo/python-list
Re: Abandoning Python
On 21/05/2011 16:49, John J Lee wrote: I still like Python after using it for over a decade, but there are things I don't like. .. a relatively new one that's going about is cobra, http://cobra-language.com/, it appears to have some of the features you indicate eg speed, some kind of interfaces (contracts I think), but it needs net or mono. -- Robin Becker -- http://mail.python.org/mailman/listinfo/python-list
windows 8 versus urllib2 certificate verify
I have an application built on 32 bit windows 7 with python 2.7.10. The application runs fine on windows 7 and older windows machines, but it is failing to connect properly using urllib2 when run on windows 8. The error CERTIFICATE_VERIFY_FAILED indcates this is some issue with urllib2 not being able to verify the remote certificate. This is pyinstaller so the python and python library seem to be constant. I thought I understood that python uses its own cert path, but obviously I am wrong. Googling sort of implies I might need certifi to be installed, but is that true? Why does this fail only on windows 8? -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
Re: windows 8 versus urllib2 certificate verify
On 12/09/2017 08:35, dieter wrote: Robin Becker writes: Certificate verification generally depends on local configuration: specifically, the set of installed trusted root certificates. I do not know about Windows, but often the root certificates installed for other packages, e.g. the browser, are used. And different versions of the same package may install different sets of trusted certificates. It might also be that your new environment lacks one of the packages from your old environment - and it has provided the required root certificate. Of course, the problem might also be caused by a general problem. Try to access a "common" https site via urllib2, one you do not have any problems to connect with a browser (or another "http" utility like "wget" or "curl") from the same machines. If this works, the problem is assiciated with the specific certificate. The certs are fine at least in all the browsers I have access to. It's pretty hard to use the python that's built in to a pyinstaller exe so I have used the certifi method and passed certifi.where() into the urlopen calls. That seems to work, but obviously if the compiled in root certs become too old problems will recur. -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
Re: How do I check all variables returned buy the functions exists
On 16/09/2017 01:58, Steve D'Aprano wrote: If you want to test for None specifically: if any(v is None for v in values): print "at least one value was None" ... for some reason that seems slow on my machine when compared with if None in values: . C:\usr\share\robin\pythonDoc>python -m timeit -s"values=(1,2,None)" "any(v is None for v in values)" 100 loops, best of 3: 0.62 usec per loop C:\usr\share\robin\pythonDoc>python -m timeit -s"values=(None,2,None)" "any(v is None for v in values)" 1000000 loops, best of 3: 0.504 usec per loop C:\usr\share\robin\pythonDoc>python -m timeit -s"values=(None,2,None)" "None in values" 1000 loops, best of 3: 0.0309 usec per loop C:\usr\share\robin\pythonDoc>python -m timeit -s"values=(1,2,None)" "None in values" 1000 loops, best of 3: 0.097 usec per loop it also seems a bit less obvious -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
Re: Even Older Man Yells At Whippersnappers
On 20/09/2017 10:54, Chris Angelico wrote: What, you take silicon that someone else created?! ChrisA well I had germanium for flipflops and dekatron tubes with neon for counters never built anything digital with valves though -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
Re: The "loop and a half"
Given the prevalence of the loop and a half idea in python I wonder why we don't have a "do" or "loop" statement to start loops without a test. C:\Python27\Lib>grep "while True" *.py | wc -l 99 C:\Python27\Lib>grep "while 1" *.py | wc -l 117 C:\Python36\Lib>grep "while True" *.py | wc -l 131 C:\Python36\Lib>grep "while 1" *.py | wc -l 44 How much does the while True actually cost compared to nothing? -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
Re: The "loop and a half"
On 04/10/2017 11:57, Rhodri James wrote: On 04/10/17 10:01, Robin Becker wrote: Given the prevalence of the loop and a half idea in python I wonder why we don't have a "do" or "loop" statement to start loops without a test. See PEP 315. Guido's rejection note is here: https://mail.python.org/pipermail/python-ideas/2013-June/021610.html seems fair enough; I suppose the cost is negligible or perhaps there's peephole optimization for this common case. -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
Re: why del is not a function or method?
On 16/10/2017 16:37, Xue Feng via Python-list wrote:
Hi,
I wonder why 'del' is not a function or method. Most operations can be used
as follows
len(team)
or
team.append("tom")
But, I think
del team[2]
is somewhat uncommon. Why does not it take a syntax we are famillar with?
It can look like a function
x = 3
del(x)
x
Traceback (most recent call last):
File "", line 1, in
NameError: name 'x' is not defined
--
Robin Becker
--
https://mail.python.org/mailman/listinfo/python-list
efficient way to get a sufficient set of identifying attributes
Given a list of objects with attributes a0, a1, a2,an-1 is there an efficient way to find sets of attributes which can be used to distinguish members of the list? As example a list of people might have firstName, lastName, nationality, postcode, phonenumber, as attributes. The probe items may have some of these attributes, but which should be used to test. Presumably the information in any attribute is highest if the number of distinct occurrences is the the same as the list length and pairs of attributes are more likely to be unique, but is there some proper way to go about determining what tests to use? A particular problem might be dynamic in that the list may be being constructed from the probes. -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
Re: efficient way to get a sufficient set of identifying attributes
On 19/10/2017 16:42, Stefan Ram wrote: Robin Becker writes: Presumably the information in any attribute is highest if the number of distinct occurrences is the the same as the list length and pairs of attributes are more likely to be unique, but is there some proper way to go about determining what tests to use? When there is a list |>>> list = [ 'b', 'b', 'c', 'd', 'c', 'b' ] |>>> l = len( list ) , the length of its set can be obtained: |>>> s = len( set( list )) . The entries are unique if the length of the set is the length of the list |>>> l == s |False And the ratio between the length of the set and the length of the list can be used to quantify the amount of repetiton. |>>> s / l |0.5 ... this sort of makes sense for single attributes, but ignores the possibility of combining the attributes to make the checks more discerning. -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
Re: efficient way to get a sufficient set of identifying attributes
On 19/10/2017 17:50, Stefan Ram wrote: Robin Becker writes: ... this sort of makes sense for single attributes, but ignores the possibility of combining the attributes to make the checks more discerning. What I wrote also applies to compound attributes (sets of base attributes). When there are n base attributes, one can form 2^n-1 compound attributes from them, or 2^n-1-n proper compound attributes. Therefore, a combinatoric explosion might impede the brute-force approach. A heuristics might start to explore combinations of keys with the best s/l ratio first and/or use preferences for certain fields set by a human. all good In database design, the keys are usually chosen by a human database designer using world knowledge. It sounds as if you want to have the computer make such a choice using only the information in the table as knowledge. I think I am tending towards the chosen by real world knowledge approach :( Your "identifying attributes" are called "super keys" in database science. You probably want minimal identifying attribute sets (without unneeded attributes), which are called "candidate keys". thanks for this and the reference below. So, now you can find and read literature, such as: Journal of Al-Nahrain University Vol.13 (2), June, 2010, pp.247-255 Science 247 Automatic Discovery Of Candidate In The Relational Databases Keys By Using Attributes Sets Closure Yasmeen F. Al-ward Department of Computer Science, College of Science, Al-Nahrain University. (The title was copied by me as found, the contents is in the web and makes more sense than the title.) -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
Re: Let's talk about debuggers!
On 25/10/2017 15:08, Michele Simionato wrote: pdb plus plus: https://pypi.python.org/pypi/pdbpp I like the idea, but in putty at least changing the terminal size causes pdb++ to detach immediately from the process and mess up the screen. I think this is caused by (5, 'Input/output error') here /home/rptlab/devel/otr/local/lib/python2.7/site-packages/pyrepl/fancy_termios.py in tcsetattr def copy(self): return self.__class__(self.as_list()) def tcgetattr(fd): return TermState(termios.tcgetattr(fd)) def tcsetattr(fd, when, attrs): termios.tcsetattr(fd, when, attrs.as_list()) error is here class Term(TermState): TS__init__ = TermState.__init__ def __init__(self, fd=0): self.TS__init__(termios.tcgetattr(fd)) self.fd = fd -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
headless python app for android/ios
In the past we have developed reportlab applications for use on android/ios devices. We used Kivy for the gui and the kivy setup did allow us to create a working reportlab pdf producer under the kivy gui. It was not exactly easy, but in the end we had a working PDF producer. A possible requirement is for pdf production using reportlab, but with others providing the gui using possible something called electron. I know very little about what is actually possible to provide api's in python under ios/android. Can the front end spawn a python process or must we run some kind of background app with listening sockets etc etc? Can applications call out to the world to download updated templates and so on? Any pointers would be useful. -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
Re: Python Templating Language
On 17/12/2017 06:41, Abdur-Rahmaan Janhangeer wrote: Hi all, Can somebody point out to me some py-based template languages interpreters resources? Thank you ! https://bitbucket.org/rptlab/preppy -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
unicode direction control characters
I'm seeing some strange characters in web responses eg u'\u200e28\u200e/\u200e09\u200e/\u200e1962' for a date of birth. The code \u200e is LEFT-TO-RIGHT MARK according to unicodedata.name. I tried unicodedata.normalize, but it leaves those characters there. Is there any standard way to deal with these? I assume that some browser+settings combination is putting these in eg perhaps the language is normally right to left but numbers are not. -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
Re: unicode direction control characters
On 02/01/2018 15:18, Chris Angelico wrote: On Wed, Jan 3, 2018 at 1:30 AM, Robin Becker wrote: I'm seeing some strange characters in web responses eg u'\u200e28\u200e/\u200e09\u200e/\u200e1962' for a date of birth. The code \u200e is LEFT-TO-RIGHT MARK according to unicodedata.name. I tried unicodedata.normalize, but it leaves those characters there. Is there any standard way to deal with these? I assume that some browser+settings combination is putting these in eg perhaps the language is normally right to left but numbers are not. Unicode normalization is a different beast altogether. You could probably just remove the LTR marks and run with the rest, though, as they don't seem to be important in this string. ChrisA I guess I'm really wondering whether the BIDI control characters have any semantic meaning. Most numbers seem to be LTR. If I saw u'\u200f12' it seems to imply that the characters should be displayed '21', but I don't know whether the number is 12 or 21. -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
Re: Tips or strategies to understanding how CPython works under the hood
http://aosabook.org/en/500L/a-python-interpreter-written-in-python.html -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
py2exe output flagged as malware
I see this has happened to others in the past. I'm using 32 bit python 2.7.10 with py2exe 3.3 on windows 7. The exes work fine, but when I try to download into windows 10 I'm getting the exes immediately removed as malware. Is there any way to prevent this. It's very bad for python programs to get this kind of reputation. Anyone know if the same happens with PyInstaller etc etc? -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
Re: py2exe output flagged as malware
On 28/02/2018 11:46, alister via Python-list wrote: On Wed, 28 Feb 2018 09:53:09 +, Robin Becker wrote: I see this has happened to others in the past. I'm using 32 bit python 2.7.10 with py2exe 3.3 on windows 7. The exes work fine, but when I try to download into windows 10 I'm getting the exes immediately removed as malware. Is there any way to prevent this. It's very bad for python programs to get this kind of reputation. Anyone know if the same happens with PyInstaller etc etc? I would suggest you contact the Anti-virus vendor, Are you sure you have download a clean copy of py2exe. The anti-virus vendor is Microsoft; I imagine I will get short shrift from them regarding this issue. Turns out my py2exe script was just pyinstaller under the hood. Apologies to py2exe. I guess someone changed the build script script to use a different python packager. I upgraded pyinstaller using the very latest pip and now the version of pyinstaller at least is 3.3.1. I don't actually know how to check the validity of the installed code or the binary stubs. After rebuilding with 3.3.1 the new exe is 10 bytes shorter and is not recognized as malware by windows 10. -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
Re: py2exe output flagged as malware
On 28/02/2018 16:25, Hartmut Goebel wrote: Am 28.02.2018 um 16:47 schrieb Robin Becker: I upgraded pyinstaller using the very latest pip and now the version of pyinstaller at least is 3.3.1. I don't actually know how to check the validity of the installed code or the binary stubs. The current archives are PyPI are PGP/GnuPG-signed, as the ones at github. so presumably I can locate the downloaded tar zip and hash it to check. Of course if pip is already busted it can out fox me anyhow. -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
is mypy failing here
I haven't used dataclasses or typing very much, but while playing about I found this didn't give me an expected error (.py312) robin@minikat:~/devel/reportlab $ cat tmp/examples/tdc.py && python tmp/examples/tdc.py && mypy tmp/examples/tdc.py ## from dataclasses import dataclass @dataclass class DC: a: str b: str def main(): dc = DC(DC, "B") print(dc) if __name__ == "__main__": main() ## DC(a=, b='B') Success: no issues found in 1 source file (.py312) robin@minikat:~/devel/reportlab DC.a is supposed to be a str and I expected mypy to indicate a type error should typing work for this case? -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
Re: is mypy failing here
On 24/11/2022 14:10, Thomas Passin wrote: . C:\temp\python>py -V Python 3.10.4 C:\temp\python>py tdc.py DC(a=, b='B') C:\temp\python>mypy tdc.py tdc.py:10: error: Argument 1 to "DC" has incompatible type "Type[DC]"; expected "str" [arg-type] Found 1 error in 1 file (checked 1 source file) Forgot the mypy version: C:\Users\tom>mypy --version mypy 0.910 interesting; I'm on archlinux and neither the system python 3.10.8 / mypy 0.982 gives an error. I did try running in my self build 3.10.8 with latest mypy 0.991 and mypy 0.910 and I still don't get an error. I'll break out the windows 10 laptop and see what happens there. You ran with the py runner. I wonder if that does something special. -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
Re: is mypy failing here
On 24/11/2022 13:50, Kirill Ratkin via Python-list wrote: mypy --strict gives you detail info. Thanks Kirill, it seems --strict does find the errors. One of those is that on line 9 I have to add a return type ie def main() -> None: . if that is added then mypy without --strict also finds the real typing error. So it seems the tool fails in the simplest cases if you forget some typing. Interesting that it works in windows without --strict though. -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
C extension custom types in abi3 module
I am trying to split off reportlab C extensions to simplify installations and
make use of more advanced packages.
A simple extension is easily converted to being an abi3 module. However, another has a custom type which uses the old
style mechanisms here
https://docs.python.org/3.7/extending/newtypes_tutorial.html#the-basics
I made a simple setup based on this abi3 example modified to allow switching
between abi3 and normal build
https://github.com/joerick/python-abi3-package-sample
I made a tiny change to the code example in the newtypes tutorial page the code
is here
https://github.com/MrBitBucket/custom-type
In a python 3.7 - 3.12a3 environment I find I can build the wheel OK with
ABI3_WHEEL=0 pip wheel -w dist .
but I get lots of compile errors if I switch to an abi3 build with
ABI3_WHEEL=1 pip wheel -w dist .
looking at the errors
src/_custom.c:10:1: error: variable ‘CustomType’ has initializer but
incomplete type
10 | static PyTypeObject CustomType = {
| ^~
In file included from
/home/robin/LOCAL/3.7.16/include/python3.7m/Python.h:90,
from src/_custom.c:2:
/home/robin/LOCAL/3.7.16/include/python3.7m/object.h:90:5: error: extra
brace group at end of initializer
90 | { PyObject_HEAD_INIT(type) size },
| ^
src/_custom.c:11:9: note: in expansion of macro ‘PyVarObject_HEAD_INIT’
11 | PyVarObject_HEAD_INIT(NULL, 0)
it looks like I have to use a different mechanism to setup custom types in the
abi3 world.
I looked in Modules/xxlimited_35.c, but that seems much more complex and
provides for a type which supports GC.
Are there any ABI3 examples using the old style strategy?
--
Robin Becker
--
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Re: C extension custom types in abi3 module
On 08/12/2022 12:52, Robin Becker wrote: I am trying to split off reportlab C extensions to simplify installations and make use of more advanced packages. A simple extension is easily converted to being an abi3 module. However, another has a custom type which uses the old style mechanisms here it looks like I have to use a different mechanism to setup custom types in the abi3 world. In the docs I see this "Also, since PyTypeObject is only part of the Limited API as an opaque struct, any extension modules using static types must be compiled for a specific Python minor version." So it seems I must switch to using a heap allocated type or keep compiling in the old way. I looked in Modules/xxlimited_35.c, but that seems much more complex and provides for a type which supports GC. Are there any ABI3 examples using the old style strategy? -- Robin Becker -- Robin Becker -- https://mail.python.org/mailman/listinfo/python-list
