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  • Python : How do you find the CPU consumption for a piece of code?

    - by Yugal Jindle
    Background: I have a django application, it works and responds pretty well on low load, but on high load like 100 users/sec, it consumes 100% CPU and then due to lack of CPU slows down. Problem : Profiling the application gives me time taken by functions. This time increases on high load. Time consumed may be due to complex calculation or for waiting for CPU. so, how to find the CPU cycles consumed by a piece of code ? Since, reducing the CPU consumption will increase the response time. I might have written extremely efficient code and need to add more CPU power OR I might have some stupid code taking the CPU and causing the slow down ? Any help is appreciated ! Update: I am using Jmeter to profile my webapp, it gives me a throughput of 2 requests/sec. [ 100 users] I get a average time of 36 seconds on 100 request vs 1.25 sec time on 1 request. More Info Configuration Nginx + Uwsgi with 4 workers No database used, using a responses from a REST API On 1st hit the response of REST API gets cached, therefore doesn't makes a difference. Using ujson for json parsing. Curious to Know: Python-Django is used by so many orgs for so many big sites, then there must be some high end Debug / Memory-CPU analysis tools. All those I found were casual snippets of code that perform profiling.

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  • Refetching a previously visited page

    - by user613665
    All, I am having a field day with page refetching. Any help or pointer will be greatly appreciated!! The behavior is a bit specific to mobile browser. Problem: I have two pages and created a shortcut link to pg#1 in the home page. Through a form submit button, user is taken from pg#1 to pg#2. All that is working fine. Now once I am on pg#2. I will leave the browser and click the shortcut later. The browser will stay on pg#2 and won't go to pg#1 even though the path in URLS is different between the two views. It is almost like Django decides that since I have already visited view#1, it doesn't need to fetch it again. This problem or behavior doesn't happen if I move the same code that handle the two views and the templates to a bare bone test project. Setup: I am using django-registration, context session. I am not using any HTML caching tag. I already have DEBUG turned on in my settings.py. Are there other ways that I can tell what the server is doing. Thanks in advance. pdxMobile Update: Here is the code snippets. def sendmsg(request): if request.method =='POST': messages.add_message(request, messages.INFO, "Hello world") return redirect ('rcvmsg') return render_to_response('sendMsg.html',RequestContext(request)) def rcvmsg(request): '''view that receives the msg.''' printMsg ='Didnt get a message' if messages: thisMsg = messages.get_messages(request) for rcvMsg in thisMsg: printMsg = rcvMsg return render_to_response('rcvMsg.html',{'print_msg':printMsg},RequestContext(request)) URL: url(r'^rcvMsg/','mydomain.mainApp.views.rcvmsg',name='rcvmsg'), (r'^sendMsg/code','mydomain.mainApp.views.sendmsg'),

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  • form.has_errors tag not working

    - by John
    Hello, Im using Django 1.2.3. I have login functionality in my site using django.contrib.auth.views.login. The user is able to login after entering correct username and password. But, form.has_errors is not working i.e. if the login credentials entered are incorrect i dont see the error message. My login.html in templates/registration is as follows : <html> <head> <title>Login</title> </head> <body> <h1>User Login</h1> {% if form.has_errors %} <p>Your username and password didn't match. Please try again.</p> {% endif %} <form method="post" action="."> {% csrf_token %} <p><label for="id_username">Username:</label> {{ form.username }}</p> <p><label for="id_password">Password:</label> {{ form.password }}</p> <input type="hidden" name="next" value="/" /> <input type="submit" value="login" /> </form> </body> </html> Any way to fix this problem? Please Help Thank You.

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  • Where should SQL/DB Queries be encapsulated in a software system?

    - by Stephen Bennet
    I frequently write small applications (either web based or otherwise) that require heavy database usage. i've attempted various ways of handling where to put the actual sql queries (sort of ad-hoc ORM systems). These include: Models that build themselves up - and only allowing SQL to be inside of a model. A sort of factory style method where the models are built by a factory class that is allowed to know about SQL. A third entity that maps models based on their fields/keys into the database and generates SQL code on the fly based on this. Is there a common knowledge of which method is best? Or another way I have missed? Clearly a lot of it will be based on the context of the system itself, which for me is usually to produce lightweight tools or utility frameworks. In experimenting, I've never found any of them that feel intuitively "right" and not clunky, but I also do not want to go for a full framework such as Django or Ruby - both because the tools I create are in a variety of languages and because they usually do not warrant that level of surrounding footprint.

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  • NLP - Queries using semantic wildcards in full text searching, maybe with Lucene?

    - by Zsolt
    Let's say I have a big corpus (for example in english or an arbitrary language), and I want to perform some semantic search on it. For example I have the query: "Be careful: [art] armada of [sg] is coming to [do sg]!" And the corpus contains the following sentence: "Be careful: an armada of alien ships is coming to destroy our planet!" It can be seen that my query string could contain "semantic placeholders", such as: [art] - some placeholder for articles (for example a / an in English) [sg], [do sg] - some placeholders for NPs and VPs (subjects and predicates) I would like to develop a library which would be capable to handle these queries efficiently. I suspect that some kind of POS-tagging would be necessary for parsing the text, but because I don't want to fully reimplement an already existing full-text search engine to make it work, I'm considering that how could I integrate this behaviour into a search engine like Lucene? I know there are SpanQueries which could behave similarly in some cases, but as I can see, Lucene doesn't do any semantic stuff with stored texts. It is possible to implement a behavior like this? Or do I have to write an own search engine?

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  • SQL queries break our game! (Back-end server is at capacity)

    - by TimH
    We have a Facebook game that stores all persistent data in a MySQL database that is running on a large Amazon RDS instance. One of our tables is 2GB in size. If I run any queries on that table that take more than a couple of seconds, any SQL actions performed by our game will fail with the error: HTTP/1.1 503 Service Unavailable: Back-end server is at capacity This obviously brings down our game! I've monitored CPU usage on the RDS instance during these periods, and though it does spike, it doesn't go much over 50%. Previously we were on a smaller instance size and it did hit 100%, so I'd hoped just throwing more CPU capacity at the problem would solve it. I now think it's an issue with the number of open connections. However, I've only been working with SQL for 8 months or so, so I'm no expert on MySQL configuration. Is there perhaps some configuration setting I can change to prevent these queries from overloading the server, or should I just not be running them whilst our game is up? I'm using MySQL Workbench to run the queries. Here's an example.... SELECT * FROM BlueBoxEngineDB.Transfer WHERE Amount = 1000 AND FromUserId = 4 AND Status='Complete'; As you can see, it's not overly complex. There are only 5 columns in the table. Any help would be very much appreciated - Thanks!

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  • Unresolved import: models

    - by Timmy O' Tool
    Hi! I'm doing my VERY first project using python/django/eclipse/pydev following this guide http://docs.djangoproject.com/en/dev/intro/tutorial01/ My only addition is the use of Eclipse/pydev. I'm getting many errors related to "Unresolved imports". I can remove the errors using "remove error markers" and my site runs perfect (I can browse it) but I want to get rid definitively of this problem since errors appear again after I removed them. Any ideas?

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  • How to browse .rst files ?

    - by Eric
    In many django projects, in the docs directory I can see *.rst files : What is the best way to browse them (without using a text editor of course) ? Is that possible to generate HTML ?

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  • Why can't my Apache see my media folder?

    - by alex
    Alias /media/ /home/matt/repos/hello/media <Directory /home/matt/repos/hello/media> Options -Indexes Order deny,allow Allow from all </Directory> WSGIScriptAlias / /home/matt/repos/hello/wsgi/django.wsgi /media is my directory. When I go to mydomain.com/media/, it says 403 Forbidden. And, the rest of my site doesn't work because all static files are 404s. Why? Edit: hello is my project folder

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  • Is there a wysiwyg editor for restructured text?

    - by dar
    Is there a wysiwyg editor for the web, like tinymce or wmd, which can produce restructured text? I'm looking for something which can be integrated with django. I would like to use rst instead of markdown because I need to convert the content entered to pdf and do some layout specific things which make rst look like a better choice.

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  • Getting a Jabber status via Python

    - by Teegijee
    I'm developing a website using the Django framework, and I need to retrieve Jabber (okay, Google Talk) statuses for a user. Most of the Jabber python libraries seem like an incredible amount of overkill (and overhead) for a simple task. Is there any simple way to do this? I know very little about XMPP/Jabber, though of course I'm willing to learn. Do you need to be an authenticated and "friended" user to retrieve another user's status?

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  • Testing Python Decorators?

    - by Jama22
    I'm writing some unit tests for a Django project, and I was wondering if its possible (or necessary?) to test some of the decorators that I wrote for it. Here is an example of a decorator that I wrote: class login_required(object): def __init__(self, f): self.f = f def __call__(self, *args): request = args[0] if request.user and request.user.is_authenticated(): return self.f(*args) return redirect('/login')

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  • (O)Auth with ExtJS

    - by TheShow
    Hi, today i tried to get django-piston and ExtJS working. I used the ExtJS restful example and the piston example to create a little restful webapp. Everything works fine except the authentication. Whats the best way to get Basic/Digest/OAuth authentication working with ExtJS? Atm I'm not sure where to set the Username/Password. Thanks

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  • bundles in java?

    - by fayer
    in symfony 2.0 and django there are bundles that contain everything for a feature (html, css, js, img, php/python). so if you want to delete one feature, you basically just delete that bundle and unregister it from "main". are there java frameworks for this too? or is it different in java cause java is a compiling language. thanks

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  • psycopg2 on cygwin: no such process

    - by Jerry
    I am trying to install postgrepsql to cygwin on a windows 7 machine and want it to work with django. After built and installed postgrepsql in cygwin, I built and installed psycopg2 in cygwin as well and got no error, but when use it in python with cygwin, I got the "no such process" error: import psycopg2 Traceback (most recent call last): File "", line 1, in File "/usr/lib/python2.5/site-packages/psycopg2/init.py", line 60, in from _psycopg import BINARY, NUMBER, STRING, DATETIME, ROWID ImportError: No such process any clues? Thanks! Jerry

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  • python Socket.IO client for sending broadcast messages to TornadIO2 server

    - by Alp
    I am building a realtime web application. I want to be able to send broadcast messages from the server-side implementation of my python application. Here is the setup: socketio.js on the client-side TornadIO2 server as Socket.IO server python on the server-side (Django framework) I can succesfully send socket.io messages from the client to the server. The server handles these and can send a response. In the following i will describe how i did that. Current Setup and Code First, we need to define a Connection which handles socket.io events: class BaseConnection(tornadio2.SocketConnection): def on_message(self, message): pass # will be run if client uses socket.emit('connect', username) @event def connect(self, username): # send answer to client which will be handled by socket.on('log', function) self.emit('log', 'hello ' + username) Starting the server is done by a Django management custom method: class Command(BaseCommand): args = '' help = 'Starts the TornadIO2 server for handling socket.io connections' def handle(self, *args, **kwargs): autoreload.main(self.run, args, kwargs) def run(self, *args, **kwargs): port = settings.SOCKETIO_PORT router = tornadio2.TornadioRouter(BaseConnection) application = tornado.web.Application( router.urls, socket_io_port = port ) print 'Starting socket.io server on port %s' % port server = SocketServer(application) Very well, the server runs now. Let's add the client code: <script type="text/javascript"> var sio = io.connect('localhost:9000'); sio.on('connect', function(data) { console.log('connected'); sio.emit('connect', '{{ user.username }}'); }); sio.on('log', function(data) { console.log("log: " + data); }); </script> Obviously, {{ user.username }} will be replaced by the username of the currently logged in user, in this example the username is "alp". Now, every time the page gets refreshed, the console output is: connected log: hello alp Therefore, invoking messages and sending responses works. But now comes the tricky part. Problems The response "hello alp" is sent only to the invoker of the socket.io message. I want to broadcast a message to all connected clients, so that they can be informed in realtime if a new user joins the party (for example in a chat application). So, here are my questions: How can i send a broadcast message to all connected clients? How can i send a broadcast message to multiple connected clients that are subscribed on a specific channel? How can i send a broadcast message anywhere in my python code (outside of the BaseConnection class)? Would this require some sort of Socket.IO client for python or is this builtin with TornadIO2? All these broadcasts should be done in a reliable way, so i guess websockets are the best choice. But i am open to all good solutions.

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  • Simplejson dumps char \

    - by Monty
    Hi! Im programming with django and i need to serialize an object to a string, but i need to get the string \/ serialized. An example: simplejson.dumps({'id' : 'root\/leaf'}) I need an output like this: '{"id": "root\/leaf"}' but i get this: '{"id": "root\\\\leaf"}' Thank you!! PD: Sorry for my english :-P

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  • Comparing two large sets of attributes

    - by andyashton
    Suppose you have a Django view that has two functions: The first function renders some XML using a XSLT stylesheet and produces a div with 1000 subelements like this: <div id="myText"> <p id="p1"><a class="note-p1" href="#" style="display:none" target="bot">?</a></strong>Lorem ipsum</p> <p id="p2"><a class="note-p2" href="#" style="display:none" target="bot">?</a></strong>Foo bar</p> <p id="p3"><a class="note-p3" href="#" style="display:none" target="bot">?</a></strong>Chocolate peanut butter</p> (etc for 1000 lines) <p id="p1000"><a class="note-p1000" href="#" style="display:none" target="bot">?</a></strong>Go Yankees!</p> </div> The second function renders another XML document using another stylesheet to produce a div like this: <div id="myNotes"> <p id="n1"><cite class="note-p1"><sup>1</sup><span>Trololo</span></cite></p> <p id="n2"><cite class="note-p1"><sup>2</sup><span>Trololo</span></cite></p> <p id="n3"><cite class="note-p2"><sup>3</sup><span>lololo</span></cite></p> (etc for n lines) <p id="n"><cite class="note-p885"><sup>n</sup><span>lololo</span></cite></p> </div> I need to see which elements in #myText have classes that match elements in #myNotes, and display them. I can do this using the following jQuery: $('#myText').find('a').each(function() { var $anchor = $(this); $('#myNotes').find('cite').each(function() { if($(this).attr('class') == $anchor.attr('class')) { $anchor.show(); }); }); However this is incredibly slow and inefficient for a large number of comparisons. What is the fastest/most efficient way to do this - is there a jQuery/js method that is reasonable for a large number of items? Or do I need to reengineer the Django code to do the work before passing it to the template?

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  • twitter login button

    - by alexarsh
    HI I have a django application running on app engine and I want to add a twitter login to my application. Do you have a good links how to do that. I already registered my app in twitter. Just don't know how to do login/logout buttons. Thanks, Arshavski Alexander

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  • app-engine-patch and "object_detail" view didn't work

    - by Hugh
    Hi(Sorry for my ugly english) When I calling the flowing: http://192.168.62.90:8000/blog/entry/?agphdXR1bW4xOTEychALEgpibG9nX2VudHJ5GCYM will use this: urlpatterns = patterns('', (r'^media/(?P<path>.*)$', 'django.views.static.serve', {'document_root': settings.MEDIA_ROOT, 'show_indexes': True}), (r'^$', list_detail.object_list, entry_info), (r'^entry/(?P<object_id>.*)$', list_detail.object_detail, {'queryset': Entry.all(), 'template_name': 'sample_test_page.html'}), ) and the error is: Generic view must be called with either an object_id or a slug/slug_field. I want to know why this didn't work for me.

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  • What exactly is a web application framework?

    - by isaiah
    I'm getting into python for cgi and came across Django. I'm not quite sure I understand it very much. Is it something I have to install inside apache or is it just something I can use with my cgi? Wanted to know because I'd love to learn it but my server I'm using doesn't give me a lot of privileges. thanks

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