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• How to force client browser to download images from server rather using its cache

  - by anonim.developer

  Assume a simple aspx data entry page in which admin user can upload an image as well as some other data. They are stored in database and the next time admin visits that page to edit record, image data fetched and a preview generated and saved to disk (using GDI+) and the preview is shown in an image control. This procedure works fine for the first time however if the image changes (a new one uploaded) the next time the page is surfed it shows previously uploaded image. I debugged the application and everything works correct. The new image data is in database and new preview is stored in Temp location however the page shows previous one. If I refresh the page it shows the new image preview. I should mention that preview is always saved to disk with one name (id of each record as the name). I think that is because of IE and other browsers use client cache instead of loading images each time a page is surfed. I wonder if there is a way to force the client browser to refresh itself so the newly uploaded image is shown without user intervention. Thanks and appreciation in advance,

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• RSA PKCS1 implementation in Python

  - by user307016

  I'm working on the RSA PKCS1 implementation in Python,here's the message block i got: m = [0,2,random paddings,0,message integers] I read the RFC2313,and get a equation seems for transforming the message block object into an big-edian integer. I just get confused about how to transform it in Python. Any help would be appreciated.

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• GAE datastore - count records between one minute ago and two minutes ago?

  - by Arthur Wulf White

  I am using GAE datastore with python and I want to count and display the number of records between two recent dates. for examples, how many records exist with a time signature between two minutes ago and three minutes ago in the datastore. Thank you. #!/usr/bin/env python import wsgiref.handlers from google.appengine.ext import db from google.appengine.ext import webapp from google.appengine.ext.webapp import template from datetime import datetime class Voice(db.Model): when = db.DateTimeProperty(auto_now_add=True) class MyHandler(webapp.RequestHandler): def get(self): voices = db.GqlQuery( 'SELECT * FROM Voice ' 'ORDER BY when DESC') values = { 'voices': voices } self.response.out.write(template.render('main.html', values)) def post(self): voice = Voice() voice.put() self.redirect('/') self.response.out.write('posted!') def main(): app = webapp.WSGIApplication([ (r'.*', MyHandler)], debug=True) wsgiref.handlers.CGIHandler().run(app) if __name__ == "__main__": main()

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• Cascading Dropdown List

  - by user333831

  I am working on a web app and trying to code a form with two dropdown lists. The list in the second dropdown will be dependent on the selection from the first one. The task itself isn’t too complicated except that once the first selection is made, I need to make a database call to pull the data for the second dropdown. This is where I am having difficulty. Both lists are in fact populated from a database. I am working on this in a python script and have been trying to do this w/ an onChange javascript function. The web app is built in Zope and page templates may be an option along w/ the python scripts.

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• How to check if a network path exist?

  - by MA1

  What is the best way to know if a network exist using python in linux?

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• C++ Structure within itself?

  - by Douglas

  I've been trying to port this code to python, but there is something I do not quite understand in C++ (I do know a bit of C++ but this is beyond me): typedef struct huffnode_s { struct huffnode_s *zero; struct huffnode_s *one; unsigned char val; float freq; } huffnode_t; What I don't get is how huffnode_s can be within itself, I've never seen this before and don't quite understand it. What does this mean, and if someone can, what would be the python equivalent?

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• How can you setup multiple WSGI apps on one server?

  - by Shakakai

  I'm working on a python based server product where a user can install WSGI-based python apps on their server. I can enforce any restriction on the application structure or format to make this easy. The user workflow would be: browse an app market, showing a list of WSGIpython apps select an app and choose "install" the app would be downloaded from a remote server to the user's server the http server would then have to be configured to start serving that application from the app's id, ex. a blog app with an id of "blog" at "/blog/", so all requests below /blog/ would be seen as root by the blog application. Any suggestions on how to set something like this up? Holler if my flow of consciousness lost you ;)

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• C++ equivalent to Python's doctests?

  - by drcraig

  I think the concept of Python's doctests is brilliant, and as a C++ programmer at a real-time shop, I'm quite jealous. We basically have no unit test capability, which is a severe hindrance. I've seen C++Unit, etc, but is there anything that can extract test cases out of comments like Python's doctests rather than putting them in the code directly?

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• Problem with number/type of arguments passed to an overloaded c++ constructor wrapped with swig.

  - by MiKo

  I am trying to wrap a c++ class (let's call it "Spam") written by someone else with swig to expose it to Python. After solving several problems, I am able to import the module in python, but when I try to create an object of such class I obtain the following error: foo = Spam.Spam('abc',3) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "Spam.py", line 96, in __init__ this = _Spam.new_Spam(*args) NotImplementedError: Wrong number of arguments for overloaded function 'new_Spam'. Possible C/C++ prototypes are: Spam(unsigned char *,unsigned long,bool,unsigned int,SSTree::io_action,char const *) Spam(unsigned char *,unsigned long,bool,unsigned int,SSTree::io_action) Spam(unsigned char *,unsigned long,bool,unsigned int) Spam(unsigned char *,unsigned long,bool) Spam(unsigned char *,unsigned long) Googling around, I realized that the error is probably caused by the type of the arguments and not by the number (which is quite confusing), but I still cannot identify. I suspect the problem lies in passing a string as the first argument, but have no idea on how to fix it (keep in mind that I know almost no c/c++).

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• what changes when your input is giga/terabyte sized?

  - by Wang

  I just took my first baby step today into real scientific computing today when I was shown a data set where the smallest file is 48000 fields by 1600 rows (haplotypes for several people, for chromosome 22). And this is considered tiny. I write Python, so I've spent the last few hours reading about HDF5, and Numpy, and PyTable, but I still feel like I'm not really grokking what a terabyte-sized data set actually means for me as a programmer. For example, someone pointed out that with larger data sets, it becomes impossible to read the whole thing into memory, not because the machine has insufficient RAM, but because the architecture has insufficient address space! It blew my mind. What other assumptions have I been relying in the classroom that just don't work with input this big? What kinds of things do I need to start doing or thinking about differently? (This doesn't have to be Python specific.)

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• Google App Engine dev_appserver can't find PIL (I've installed it)

  - by goggin13

  I recently upgraded my Google App Engine launcher on my Mac, running OSX 10.5.8, and afterwards my projects that work with images stopped working locally. It seems to be the same problem that I had when first using GAE locally to work with images, before I installed PIL. Here is the error I get: SystemError: Parent module 'PIL' not loaded I have PIL installed. When I run python normally, I can access it and work with it as expected. I also checked to ensure that dev_appserver.py was running the same version of Python. If I open the interpreter and type sys.version I get this back: 2.5 (r25:51918, Sep 19 2006, 08:49:13) [GCC 4.0.1 (Apple Computer, Inc. build 5341)] This is identical to what I get when I display the sys.version from my projects running through dev_appserver. Any thoughts on why dev_appserver can't find the PIL module? I have been banging my head against this for a bit. Thank you!

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• ExpandoObject (dynamics) my greatest friend or my new greatest foe?

  - by WeNeedAnswers

  Yes I know that it shouldn't be abused and that C# is primariy used as a static language. But seriously folks if you could just dirty up some code, in the python style, or create some dynamic do hicky, would you? My mind is working overtime on this having spent a while loving the dynamics of python, is c# going over to the dark side through the back door? Is the argument for static typing a dead one with this obvious addition? Is the argument for less Unit testing a bit silly when we are all grown ups? Or has the addition of dynamics ruined a strongly static typed and well designed language?

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• gVim and multiple programming languages

  - by Abhi

  My day job involves coding with Perl. At home I play around with Python and Erlang. For Perl I want to indent my code with two spaces. Whereas for Python the standard is 4. Also I have some key bindings to open function declarations which I would like to use with all programming languages. How can this be achieved in gVim? As in, is there a way to maintain a configuration file for each programming language or something of that sort?

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• Find value within a range in lookup table

  - by francis

  I have the simplest problem to implement, but so far I have not been able to get my head around a solution in Python. I have built a table that looks similar to this one: 501 - ASIA 1262 - EUROPE 3389 - LATAM 5409 - US I will test a certain value to see if it falls within these ranges, 389 -> ASIA, 1300 -> LATAM, 5400 -> US. A value greater than 5409 should not return a lookup value. I normally have a one to one match, and would implement a dictionary for the lookup. But in this case I have to consider these ranges, and I am not seeing my way out of the problem. Maybe without providing the whole solution, could you provide some comments that would help me look in the right direction? It is very similar to a vlookup in a spreadsheet. I would describe my Python knowledge as somewhere in between basic to intermediate. Many thanks in advance.

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• nightmare with relative imports, how does pep 366 work?

  - by pygabriel

  I have a "canonical file structure" like that (I'm giving sensible names to ease the reading): mainpack/ __main__.py __init__.py - helpers/ __init__.py path.py - network/ __init__.py clientlib.py server.py - gui/ __init__.py mainwindow.py controllers.py In this structure, for example modules contained in each package may want to access the helpers utilities through relative imports in something like: # network/clientlib.py from ..helpers.path import create_dir The program is runned "as a script" using the __main__.py file in this way: python mainpack/ Trying to follow the PEP 366 I've put in __main__.py these lines: ___package___ = "mainpack" from .network.clientlib import helloclient But when running: $ python mainpack Traceback (most recent call last): File "/usr/lib/python2.6/runpy.py", line 122, in _run_module_as_main "__main__", fname, loader, pkg_name) File "/usr/lib/python2.6/runpy.py", line 34, in _run_code exec code in run_globals File "path/mainpack/__main__.py", line 2, in <module> from .network.clientlib import helloclient SystemError: Parent module 'mainpack' not loaded, cannot perform relative import What's wrong? What is the correct way to handle and effectively use relative imports? I've tried also to add the current directory to the PYTHONPATH, nothing changes.

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• Can't authenticate mobile client with node.js (using passport.js)

  - by Pazinio

  I'm trying to build some CRUD application with node.js as a back-end API (express) and web-app (backbone) and mobile client (native android) as front-ends.(I'm node.js beginner) My server solution is based on the following great tutorial 'easy-node-authentication'. In my android app I have managed to get the user Google-Token after I completed the authentication step with Google Plus SDK.(mobile to google-plus directly request). I'm trying to understand and find right and elegant way to re-use a given google-token and authenticate again my android user through Google-Plus account to ensure the mobile client holds real token, then add a new entry (id, token, email, name) to my users table DB within my node back-end. The question is: what should be my next step in case I want to keep my back-end without changes? should I send a GET request with the token as a cookie to /auth/google? maybe to /auth/google/callback? another URL? Does this make sense at all? Please note: I'm aware to the fact the mentioned above 'easy-node-auth' solution is based on sessions and cookies. having said that, i'm still trying to understand if there is a convenient way to integrate both (android and node) as it works good for my web-app and node. Thanks in advance.

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• Django Import Error with URLS and ROOT_URLCONF confusion

  - by tipu

  The error can be seen here: http://djaffry.selfip.com:8080/ In httpd conf, <VirtualHost *:8080> ServerName tweet_search_engine DocumentRoot /var/www/microblogsearchengine/twingle </VirtualHost> <Directory /var/www/microblogsearchengine/twingle> SetHandler python-program PythonHandler django.core.handlers.modpython SetEnv DJANGO_SETTINGS_MODULE settings PythonOption django.root /var/www/microbloggingsearchengine/twingle PythonDebug On </Directory> Running python manage.py runserver and visiting localhost:8000 returns a splash page telling me everything is okay. However when I visit this site through apache, I get an import error with urls. In my settings.py file I have a line, ROOT_URLCONF = 'twingle.urls' I'm assuming this is the cause of the error. The project folder contains only 4 files: __init__.py manage.py settings.py urls.py I tried replacing twingle.urls with urls.py but then it gave me a different error. What is it I can do to get this working?

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• grouping objects to achieve a similar mean property for all groups

  - by cytochrome

  I have a collection of objects, each of which has a numerical 'weight'. I would like to create groups of these objects such that each group has approximately the same arithmetic mean of object weights. The groups won't necessarily have the same number of members, but the size of groups will be within one of each other. In terms of numbers, there will be between 50 and 100 objects and the maximum group size will be about 5. Is this a well-known type of problem? It seems a bit like a knapsack or partition problem. Are efficient algorithms known to solve it? As a first step, I created a python script that achieves very crude equivalence of mean weights by sorting the objects by weight, subgrouping these objects, and then distributing a member of each subgroup to one of the final groups. I am comfortable programming in python, so if existing packages or modules exist to achieve part of this functionality, I'd appreciate hearing about them. Thank you for your help and suggestions.

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• How to expose a web appication via API ?

  - by iamgopal

  Hi , we have create a web application on top of google app engine and python. which is almost about to complete it web front phase. I would also like to make it available almost all part of it to external applications. { via , xml , json , http , as many as possible. } . what's the best way to do it ? any library either for python or django available out ther ? Thanks.

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• how to make the username and email is Unique .. using WTFroms

  - by zjm1126

  wtforms is a forms validation and rendering library for python web development but i can't find how to handle the username and email Unique , thanks

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• WCF publish/subscribe service, and ASP.NET MVC client

  - by d3j4vu

  I managed to develop a custom WCF service, using the publish / subscribe model, and hosted inside a managed windows service. Everything's working. I developed an interface as the service contract implementing a method definition marked as a non-one way operation contract (OperationContract(IsOneWay = false)]. This, to make possible returns an instance of a custom class derived from System.Web.Mvc.ActionResult. In the MVC app, event fires ok. It wraps inside an action method, (just the one defined in the interface), but, and this is my current problem, i believe that something relative to the execution context of the windows service (and the hosted wcf counterpart) blocks the execution of the action method in the MVC app. This is what i have until now (some pieces ripped off just to be more clear): /// Method definition for the contract's service. Maps to a MVC ActionMethod. [OperationContract(IsOneWay = false)] ActionResult Imagen(string data, CustomActionResult result); The class to hold an ActionResult derived class instance: public class ServiceEventArgsMvc : ServiceEventArgs { /// <summary> /// /// </summary> public CustomActionResult Result { get; set; } } And the code in the MVC client app: /// <summary> /// Just a simple class to hold an abstract ActionResult derived class instance. /// </summary> public ActionResult Image(string data, CustomActionResult result) { ViewData["data"] = data; return View(); } Ok. ActionMethod sucessfully executes...but when it's done (and usually expected obtain a reditection to a View named Image, like the action method), the WCF service throws a Timeout exception, making clear that he's still waiting for a response from the MVC client. The response never arrives, so the MVC app never finish his work (redirect to the "Image" view as expected). Any ideas?. Guess i'm missing something very simple, but i don't know what it could be. This is drivin' me nuts.

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• Google App Engine says "Must authenticate first." while trying to deploy any app

  - by Oleksandr Bolotov

  Google App Engine says "Must authenticate first." while trying to deploy any app: me@myhost /opt/google_appengine $ python appcfg.py update ~/sda2/workspace/lyapapam/ Application: lyapapam; version: 1. Server: appengine.google.com. Scanning files on local disk. Scanned 500 files. Scanned 1000 files. Initiating update. Email: <my_email_was_here>@gmail.com Password for <my_email_was_here>@gmail.com: Error 401: --- begin server output --- Must authenticate first. --- end server output --- We are getting this message with any appliation and under any developer account avialable to us That's what we have installed: App Engine SDK - 1.3.2 PIL - 1.1.7 Python - 2.5.5 pip - 0.6.3 ssl - 1.15 wsgiref - 0.1.2 How can I fix it? Is it well known problem?

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• In a pre-commit hook - how to access/compare current and previous versions of files

  - by EthanML

  I'm trying to add to our existing pre-commit SVN hook so that it will check for and block an increase in file size for files in specific directory/s. I've written a python script to compare two file sizes, which takes two files as arguments and uses sys.exit(0) or (1) to return the result, this part seems to work fine. My problem is in calling the python script from the batch file, how to reference the newly committed and previous versions of each file? The existing code is new to me and a mess of %REPOS%, %TXN%s etc and I'm not sure how to go about using them. Is there a simple, standard way of doing this? It also already contains code to loop through the changed files using svnlook changed, so that part shouldn't be an issue. Thanks very much

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• GUI for server-client program

  - by sksingh73

  I am making a server-client application in c++. In this i am also using shared memory & file read-write operations. my program is completely ready & i now wants to make a gui for it. someone suggested me to go for QT4, but when i tried it, i found i have to re-write 80% of the code because QT has got its own classes & variable. i don't want to do it. i want suggestions from you on this regard. my requirements for gui are very simple i.e there will be a main form, which will have two text boxes in which all messages being sent & received by client & server should be shown. there should be another lineedit box, through which i can send the messages to the other end server. I don't know how to make this gui. someone suggested tcl/tk, other suggested me use php/swig. i am not sure how to go about this. my only requirement is that i want to make this simple gui with minimum of changes in my code. THANX

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• Is there a 'hello world' website for django? OR (I've installed django, now what) ?

  - by morpheous

  I'm learning Python and decided to start familiarizing myself with the (defacto?) Python web framework - django. I have successfully installed the latest release of django. I want a simple 'hello world' website that will get me up and running quickly. I am already familiar with web frameworks (albeit for different languages) - so I just need a simple 'hello world' example website to help me get going. Ideally, I don't want to mess up with my Apache server settings (as I am still experimenting), so I want to use the lightweight web server that django bundles. I cant seem to find how to do this on the django website though - no doubt someone will post a link and shame me ... So, does anyone know of a link that shows how to get a simple 'hello world' django website up and running with minimal fuss?

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