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• SQL Server Query solution cum Suggestion Required

  - by Nirmal

  Hello All... I have a following scenario in my SQL Server 2005 database. zipcodes table has following fields and value (just a sample): zipcode latitude longitude ------- -------- --------- 65201 123.456 456.789 65203 126.546 444.444 and place table has following fields and value : id name zip latitude longitude -- ---- --- -------- --------- 1 abc 65201 NULL NULL 2 def 65202 NULL NULL 3 ghi 65203 NULL NULL 4 jkl 65204 NULL NULL Now, my requirement is like I want to compare my zip codes of place table and update the available latitude and longitude fields from zipcode table. And there are some of the zipcodes which has no entry in zipcode table, so that should remain null. And the major issue is like I have more then 50,00,000 records in my db. So, query should support this feature. I have tried some of the solutions but unfortunately not getting proper output. Any help would be appreciated...

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• Scala isn't allowing me to execute a batch file whose path contains spaces.Same Java code does.What

  - by Geo

  Here's the code I have: var commandsBuffer = List[String]() commandsBuffer ::= "cmd.exe" commandsBuffer ::= "/c" commandsBuffer ::= '"'+vcVarsAll.getAbsolutePath+'"' commandsBuffer ::= "&&" otherCommands.foreach(c => commandsBuffer ::= c) val asArray = commandsBuffer.reverse.toArray val processOutput = processutils.Proc.executeCommand(asArray,true) return processOutput otherCommands is an Array[String], containing the following elements: vcbuild /rebuild path to a .sln file vcVarsAll contains the path to Visual Studio's vcvarsall.bat. It's path is C:\tools\microsoft visual studio 2005\vc\vcvarsall.bat. The error I receive is: 'c:\Tools\Microsoft' is not recognized as an internal or external command, operable program or batch file.. The processutils.Proc.executeCommand has the following implementation: def executeCommand(params:Array[String],display:Boolean):(String,String) = { val process = java.lang.Runtime.getRuntime.exec(params) val outStream = process.getInputStream val errStream = process.getErrorStream ... } The same code, executed from Java/Groovy works. What am I doing wrong?

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• Stochastic calculus library in python

  - by LeMiz

  Hello, I am looking for a python library that would allow me to compute stochastic calculus stuff, like the (conditional) expectation of a random process I would define the diffusion. I had a look a at simpy (simpy.sourceforge.net), but it does not seem to cover my needs. This is for quick prototyping and experimentation. In java, I used with some success the (now inactive) http://martingale.berlios.de/Martingale.html library. The problem is not difficult in itself, but there is a lot non trivial, boilerplate things to do (efficient memory use, variable reduction techniques, and so on). Ideally, I would be able to write something like this (just illustrative): def my_diffusion(t, dt, past_values, world, **kwargs): W1, W2 = world.correlated_brownians_pair(correlation=kwargs['rho']) X = past_values[-1] sigma_1 = kwargs['sigma1'] sigma_2 = kwargs['sigma2'] dX = kwargs['mu'] * X * dt + sigma_1 * W1 * X * math.sqrt(dt) + sigma_2 * W2 * X * X * math.sqrt(dt) return X + dX X = RandomProcess(diffusion=my_diffusion, x0 = 1.0) print X.expectancy(T=252, dt = 1./252., N_simul= 50000, world=World(random_generator='sobol'), sigma1 = 0.3, sigma2 = 0.01, rho=-0.1) Does someone knows of something else than reimplementing it in numpy for example ?

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• Django unable to update model

  - by user292652

  i have the following function to override the default save function in a model match def save(self, *args, **kwargs): if self.Match_Status == "F": Team.objects.filter(pk=self.Team_one.id).update(Played=F('Played')+1) Team.objects.filter(pk=self.Team_two.id).update(Played=F('Played')+1) if self.Winner !="": Team.objects.filter(pk=self.Winner.id).update(Win=F('Win')+1, Points=F('Points')+3) else: return if self.Match_Status == "D": Team.objects.filter(pk=self.Team_one.id).update(Played=F('Played')+1, Draw = F('Draw')+1, Points=F('Points')+1) Team.objects.filter(pk=self.Team_two.id).update(Played=F('Played')+1, Draw = F('Draw')+1, Points=F('Points')+1) super(Match, self).save(*args, **kwargs) I am able to save the match model just fine but Team model does not seem to be updating at all and no error is being thrown. am i missing some thing here ?

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• Button_to uses POST Link_to uses GET, why? ROR

  - by JZ

  I've ran into a ror problem using the link_to. Why does my link to use the GET method and my button_to use the POST method, after I specified my "method"="post" within the link_to parameters? View: <%= button_to "pdf", :action => 'getquote' %> <%= link_to 'pdf', {:controller => 'inventories', :action => 'getquote', :method => :post } %> Controller Method: def getquote @cart = find_cart respond_to do |format| format.pdf end end Terminal Output (Button/Link, respectively): Processing InventoriesController#getquote (for 127.0.0.1 at 2010-01-30 01:38:02) [POST] Parameters: {"action"=>"getquote", "authenticity_token"=>"D2cwnHyTHgomdUM3wXBBXlOe4NQLmv1Srn0paLbExpQ=", "controller"=>"inventories"} Processing InventoriesController#show (for 127.0.0.1 at 2010-01-30 01:39:07) [GET] Parameters: {"method"=>"post", "action"=>"show", "id"=>"getquote", "controller"=>"inventories"}

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• Using python to play two sin tones at once

  - by Alex

  Im using python to a sine tone. the tone is based off the computers internal time in minutes, but id like to simultaneously play one based off the second for a harmonized or dualing sound. This is what I have so far can someone point me in the right direction. from struct import pack from math import sin, pi import time def au_file(name, freq, dur, vol): fout = open(name, 'wb') # header needs size, encoding=2, sampling_rate=8000, channel=1 fout.write('.snd' + pack('>5L', 24, 8*dur, 2, 8000, 1)) factor = 2 * pi * freq/8000 # write data for seg in range(8 * dur): # sine wave calculations sin_seg = sin(seg * factor) fout.write(pack('b', vol * 127 * sin_seg)) fout.close() t = time.strftime("%S", time.localtime()) ti = time.strftime("%M", time.localtime()) tis = float(t) tis = tis * 100 tim = float(ti) tim = tim * 100 if name == 'main': au_file(name='timeSound1.au', freq = tim, dur=1000, vol=1.0) import os os.startfile('timeSound1.au')

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• ruby-debug with Pow -- breakpoints never hit

  - by 99miles

  I'm trying to use ruby-debug with Pow. Rails 3 app. I have done everything here: https://gist.github.com/1098830 I've restarted the server and machine several times. I can get rdebug to connect: ? rdebug -c Connected. but it never stops at the breakpoints. Any idea what could be going on? I got it to hit a few breakpoints a few hours ago, and not since. controller def index debugger ... end Gemfile gem 'ruby-debug19', :require => 'ruby-debug' development.rb EG::Application.configure do ... require 'ruby-debug' Debugger.start_remote Debugger.settings[:autoeval] = true puts "=> Debugger enabled" end

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• django return file over HttpResonse - file is not served correctly

  - by Tom Tom

  I want to return some files in a HttpResponse and I'm using the following function. The file that is returned always has a filesize of 1kb and I do not know why. I can open the file, but it seems that it is not served correctly. Thus I wanted to know how one can return files with django/python over a HttpResponse. @login_required def serve_upload_files(request, file_url): import os.path import mimetypes mimetypes.init() try: file_path = settings.UPLOAD_LOCATION + '/' + file_url fsock = open(file_path,"r") #fsock = open(file_path,"r").read() file_name = os.path.basename(file_path) mime_type_guess = mimetypes.guess_type(file_name) try: if mime_type_guess is not None: response = HttpResponse(mimetype=mime_type_guess[0]) response['Content-Disposition'] = 'attachment; filename=' + file_name response.write(fsock) finally: fsock.close() except IOError: response = HttpResponseNotFound() return response

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• getting internal server error using rest-client in ruby to post to HTTP POST

  - by Angela

  Hi, this is my code and I don't know how to debug it because I just get an "internal server error": I am trying to HTTP POST to an external ASPX: def upload uri = 'https://api.postalmethods.com/2009-02-26/PostalWS.asmx' #postalmethods URI #https://api.postalmethods.com/2009-02-26/PostalWS.asmx?op=UploadFile #http://www.postalmethods.com/method/2009-02-26/UploadFile @postalcard = Postalcard.find(:last) #Username=string&Password=string&MyFileName=string&FileBinaryData=string&FileBinaryData=string&Permissions=string&Description=string&Overwrite=string filename = @postalcard.postalimage.original_filename filebinarydata = File.open("#{@postalcard.postalimage.path}",'rb') body = "Username=me&Password=sekret&MyFileName=#{filename}&FileBinaryData=#{filebinarydata}" @response = RestClient.post(uri, body, #body as string {"Content-Type" => 'application/x-www-form-urlencoded', "Content-Length" => @postalcard.postalimage.size} # end headers ) #close arguments to Restclient.post end

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• casting raw strings python

  - by dave

  in python, given a variable which holds a string is there a quick way to cast that into another raw string variable? the following code should illustrate what im after... def checkEqual(x, y): print True if x==y else False line1 = "hurr..\n..durr" line2 = r"hurr..\n..durr" line3 = "%r"%line1 print "%s \n\n%s \n\n%s \n" % (line1, line2, line3) checkEqual(line2, line3) #outputs False checkEqual(line2, line3[1:-1]) #outputs True The closest I have found so far is the %r formatting flag which seems to return a raw string albeit within single quote marks. Is there any easier way to do this like a line3 = raw(line1) kind of thing?

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• Using multilingual and localeurl in django

  - by Dmitry A. Erokhin

  Using dajngo-multilingual and localeurl. Small sample of my main page view: def main(request): #View for http://www.mysite.com/ name = Dog.objects.all()[0].full_name #this is a translated field return render_to_response("home.html", {"name" : name}) Entering http://www.mysite.com/ redirects me to http://www.mysite.com/ru/ and "name" variable gets russian localization. For now it's ok... But... Entering http://www.mysite.com/en/ shows me same russian loclized variable. During my experiments with debuger I've discovered: request.LANGUAGE_CODE is changing properly according to /en/ or /ru/ url suffix (thanx to localeurl) invoking multilingual.languages.set_default_language() makes "name" variable change loclization The question is: should I change language of django-multilingual to request.LANGUAGE_CODE in each of my view myself, or it must be solved automaticly and I've done something wrong?

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• Function parameter types in Python

  - by Leif Andersen

  Unless I'm mistaken, creating a function in python works like this def my_func(param1, param2): /*stuff*/ However, you don't actually give the types of those parameters. Also, if I remember, python is a strongly typed language, as such, it seams like python shouldn't let you pass in a parameter of a different type then the function creator expected. However, how does python know that the user of the function is passing in the proper types? Or will the program just die if it's the wrong type, assuming the function actually uses the parameter? Or do you have to specify the type/I'm missing something? Thank you.

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• Displaying webcam feed using opencv and python

  - by Mitch

  Hi ive been trying to create a simple program with python which utilises opencv to get a video feed from my webcam and display it on the screen. I know im partly there because the window is created and the light on my webcam flicks on, but it just doesnt seem to show anything in the window. hopefully someone can explain what im doing wrong. import cv cv.NamedWindow("w1", cv.CV_WINDOW_AUTOSIZE) capture = cv.CaptureFromCAM(0) def repeat(): frame = cv.QueryFrame(capture) cv.ShowImage("w1", frame) while True: repeat() on an unrelated note, i have noticed that my webcam sometimes changes its index number in cv.CaptureFromCAM and sometimes i need to put in 0, 1 or 2 even though i only have one camera connected and i havnt unplugged it (i know because the light doesnt come on unless i change the index). is there a way to get python to determine the correct index? thanks Mitch

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• Modify on-the-fly verbose_name in a model field on django admin

  - by PerroVerd

  Hi I have this sample model working with the admin class Author(models.Model): name = models.CharField(_('Text in here'), max_length=100) with verbose_name set as ugettext_lazy 'Text in here', but sometimes, depending on the site_id i want to present a diferent verbose name, so I modified the init in this way def __init__(self, *args, **kwargs): super(Author, self).__init__(*args, **kwargs) #some logic in here self._meta.get_field('name').verbose_name = _('Other text') It works, displaying the 'Other text' instead the 'Text in here'... except for the very first time the author/add view is used. ¿Is it the right way to do it? ¿How can i fix the first time problem? Thanks in advance

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• PySide / PyQt QStyledItemDelegate list in table

  - by danodonovan

  Dear All, I'm trying to create a table of lists in Python with Qt (PySide/PyQt - matters not) and my lists are squashed into the table cells. Is there a way to get the list delegates to 'pop out' of their cells? I've attached a simple code snippet - replace 'PySide' with 'PyQt4' depending on your preference from PySide import QtCore, QtGui class ListDelegate(QtGui.QStyledItemDelegate): def createEditor(self, parent, option, index): editor = QtGui.QListWidget(parent) for i in range( 12 ): editor.addItem('list item %d' % i) return editor if __name__ == '__main__': import sys app = QtGui.QApplication(sys.argv) model = QtGui.QStandardItemModel(2, 2) tableView = QtGui.QTableView() delegate = ListDelegate() tableView.setItemDelegate(delegate) tableView.setModel(model) for row in range(2): for column in range(2): item = QtGui.QStandardItem( 'None' ) model.setItem(row, column, item) tableView.setWindowTitle('example') tableView.show() sys.exit(app.exec_()) If you hadn't guessed I'm pretty new to this Qt lark Thanks in advance, Dan

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• Cannot format first column in WxPython's ListCtrl

  - by Matt Clarke

  If I set the format of the first column in a ListCtrl to align centre (or align right) nothing happens. It works for the other columns. This only happens on Windows - I have tested it on Linux and it works fine. Does anyone know if there is a work-round or other solution? Here is an example based on code found at http://zetcode.com/wxpython/ import wx import sys packages = [('jessica alba', 'pomona', '1981'), ('sigourney weaver', 'new york', '1949'), ('angelina jolie', 'los angeles', '1975'), ('natalie portman', 'jerusalem', '1981'), ('rachel weiss', 'london', '1971'), ('scarlett johansson', 'new york', '1984' )] class Actresses(wx.Frame): def __init__(self, parent, id, title): wx.Frame.__init__(self, parent, id, title, size=(380, 230)) hbox = wx.BoxSizer(wx.HORIZONTAL) panel = wx.Panel(self, -1) self.list = wx.ListCtrl(panel, -1, style=wx.LC_REPORT) self.list.InsertColumn(0, 'name', wx.LIST_FORMAT_CENTRE,width=140) self.list.InsertColumn(1, 'place', wx.LIST_FORMAT_CENTRE,width=130) self.list.InsertColumn(2, 'year', wx.LIST_FORMAT_CENTRE, 90) for i in packages: index = self.list.InsertStringItem(sys.maxint, i[0]) self.list.SetStringItem(index, 1, i[1]) self.list.SetStringItem(index, 2, i[2]) hbox.Add(self.list, 1, wx.EXPAND) panel.SetSizer(hbox) self.Centre() self.Show(True) app = wx.App() Actresses(None, -1, 'actresses') app.MainLoop()

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• Django/MySQL - __istartswith not producing case-insensitive query.

  - by TheLizardKing

  I make use of generic views and I am attempting to query my MySQL db (utf8_bin collation) in a case insensitive manor to try to find all my song titles that start with a particular letter. view.py def tracks_by_title(request, starts_with): return object_list( request, queryset = Track.objects.filter(title__istartswith=starts_with), template_name = 'tlkmusic_base/titles_list.html', template_object_name = 'tracks', paginate_by = 25, ) and my urls.py urlpatterns = patterns('tlkmusic.apps.tlkmusic_base.views', (r'^titles/(?P<starts_with>\w)/$', tracks_by_title), ) the query it produces according to the django debug toolbar is: SELECT `tracks`.`id`, `tracks`.`url`, `tracks`.`artist`, `tracks`.`album`, `tracks`.`genre`, `tracks`.`year`, `tracks`.`title`, `tracks`.`comment`, `tracks`.`tracknumber`, `tracks`.`discnumber`, `tracks`.`bitrate`, `tracks`.`length`, `tracks`.`samplerate`, `tracks`.`filesize`, `tracks`.`createdate`, `tracks`.`modifydate` FROM `tracks` WHERE `tracks`.`title` LIKE a% LIMIT 1 specifically this line: WHERE `tracks`.`title` LIKE a% LIMIT 1 Why is it not ILIKE which is what I was expecting by using __istartswith? I am using Django 1.1.1 on Ubuntu.

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• ruby rails loop causes server freeze

  - by Darkerstar

  Hi all: I am working on a Ruby on Rails project on Windows. I have Ruby 1.86 and Rails 2.35 installed. Everything is fine until I tried to implement a comet process. I have the following code written to respond to a long poll javascript request. But everytime this function is called, it will hang the whole rails server, no second request can get in, until the timeout. (I know there is juggernaut, but I like to implement one myself first :) Is this due to my server setup? The project will be deployed on a linux server with Ngix and Passenger setup, will it suffer the same problem? def comet_hook timeout(5) do while true do key = 'station_' + station_id.to_s + '_message_lastwrite' if Rails.cache.exist?(key) @cache_time = DateTime.parse(Rails.cache.read(key)) if @cache_time > hook_start @messages = @station.messages_posted_after(hook_start) hook_start = @cache_time break end end end ... end Also with Rails memory store cache, I keep getting "cannot modify frozen object" error, so the above script only worked for me when I switched to File cache. :(

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• Convert a List of Options to an Option of List using Scalaz

  - by Rafael de F. Ferreira

  The following function transforms a list of Option[T] into a list of Some[T], in the case where all members are Some's, or None, in the case where there is at least one None member. I guess the code is clearer that this explanation: def lo2ol[T](lo: List[Option[T]]): Option[List[T]] = { lo.foldRight[Option[List[T]]](Some(Nil)){(o, ol) => (o, ol) match { case (Some(x), Some(xs)) => Some(x :: xs); case _ => None : Option[List[T]]; }}} I remember seeing somewhere a similar example, but using Scalaz to simplify the code. How would it look like?

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• Why does python use 'magic methods'?

  - by Greg Beech

  I've been playing around with Python recently, and one thing I'm finding a bit odd is the extensive use of 'magic methods', e.g. to make its length available an object implements a method def __len__(self) and then it is called when you write len(obj). I was just wondering why objects don't simply define a len(self) method and have it called directly as a member of the object, e.g. obj.len()? I'm sure there must be good reasons for Python doing it the way it does, but as a newbie I haven't worked out what they are yet.

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• Trouble using eval() with cython

  - by Peter Stewart

  I was trying to speed up some code, and then I tried compiling a class and a function using cython and WOW! I havn't measured it yet but it looks at least 10x faster. I first looked at cython just two days ago, I'm very impressed! However, I can't get eval() to work. def thefirst(int a): d = eval('1+2+a') return d I compile this to module1.pyd file and call it with the python file: from module1 import thefirst x = thefirst(2) print x This returns: NameError: name 'a' is not defined. All help is appreciated.

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• how to rest my app to support mobile phone

  - by qichunren

  I am now going to develop a mobile website both support common html format page and wml format page(Because now a usual web browser on mobile can view html page and some old mobiles only support wml ) First step: register content type for wml page config/initializers/mime_types.rb Mime::Type.register_alias "text/vnd.wap.wml", :wml Second: Create two format page for an action in view: class WelcomeController < ApplicationController def index @latest_on_sale_auctions = Auction.latest(15) respond_to do |format| format.html format.wml end end end It works well as I visit: http://localhost:3000/welcome But got: Routing Error No route matches "/welcome.wml" with {:method=:get} as I visit:http://localhost:3000/welcome.wml and it works well as I visit:http://localhost:3000/welcome?format=wml my config/routes.rb like this: ActionController::Routing::Routes.draw do |map| map.root :controller => "welcome" map.connect ':controller/:action/:id' map.connect ':controller/:action/:id.:format' end My rails version is 2.3.5,please help me, I want a restful app,both support html and wml.

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• Django IN query as a string result - invalid literal for int() with base 10

  - by bmelton

  Trying to query a 'Favorites' model to get a list of items a user has favorited, and then querying against a different model to get the objects back from that query to present to the template, but I'm getting an error: "invalid literal for int() with base 10" Looking over all of the other instances of that error, I couldn't find any in which the asker actually wanted to work with a comma separated list of integers, so I'm kind of at a loss. Model class Favorite(models.Model): # key should be the model name, id is the model.id, and user is the User object. key = models.CharField(max_length=255, unique=True) val = models.IntegerField(default=0) user = models.ForeignKey(User) class Admin: list_display = ('key', 'id', 'user') View def index(request): favorites = Favorite.objects.filter(key='blog', user=request.user.pk) values = "" for favorite in favorites: values += "%s," % favorite.val #values = "[%s]" % values blogs = Blog.objects.filter(pk__in=values) return render_to_response('favorite/index.html', { "favorites" : favorites, "blogs" : blogs, "values" : values, }, context_instance=RequestContext(request) ) enter code here

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• django 'if' statement improperly formatted

  - by Zayatzz

  Im getting strangest error in django so far: 'if' statement improperly formatted Template that raises the error is this: {% if diff >= 0 %} <span class="pos">+{{ diff }} {% else %} <span class="neg">-{{ diff }} {% endif %} </span> <span>{{ a }}</span> view that has a and diff in context is this: def add(request, kaart_id): if request.is_ajax() and request.method == 'POST': x = Kaart.objects.get(id=kaart_id) x.pos += 1 x.save x = Kaart.objects.get(id=kaart_id) from django.utils import simplejson diff = x.pos - x.neg a = "(+1)" context = { 'diff':diff, 'a':a } return render_to_response('sum.html', context, context_instance=RequestContext(request)) It does not matter what equation i use in if, , =, ==.. they all raise the same error. and as far as i can tell its all by the book: http://docs.djangoproject.com/en/dev/ref/templates/builtins/#id5 Alan.

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• django urls.py regex isn't working

  - by Phil

  This is for Django 1.2.5 and Python 2.7 on Wamp Server running apache version 2.2.17. My problem is that the my URLConf in urls.py isn't redirecting, it's just throwing a 404 error. urls.py: from django.conf.urls.defaults import * # Uncomment the next two lines to enable the admin: #from django.contrib import admin #admin.autodiscover() urlpatterns = patterns('', (r'^app/$', include('app.views.index')), # Uncomment the admin/doc line below to enable admin documentation: #(r'^admin/doc/', include('django.contrib.admindocs.urls')), # Uncomment the next line to enable the admin: #(r'^admin/', include(admin.site.urls)), ) views.py from django.http import HttpResponse def index(request): return HttpResponse("Hello World") I'm getting the following error: ImportError at /app/ No module named index I'm stumped as I'm only learning Django, can anybody see something wrong with my code? Here's my PythonPath: ['C:\Windows\system32\python27.zip', 'C:\Python27\Lib', 'C:\Python27\DLLs', 'C:\Python27\Lib\lib-tk', 'C:\wamp\bin\apache\Apache2.2.17', 'C:\wamp\bin\apache\apache2.2.17\bin', 'C:\Python27', 'C:\Python27\lib\site-packages', 'c:\wamp\www\seetwo']

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