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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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  • 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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  • 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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  • 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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  • Why is there an implicit conversion from Float/Double to BigDecimal, but not from String?

    - by soc
    Although the situation of conversion from Doubles to BigDecimals has improved a bit compared to Java scala> new java.math.BigDecimal(0.2) res0: java.math.BigDecimal = 0.20000000000000001110223024625156... scala> BigDecimal(0.2) res1: scala.math.BigDecimal = 0.2 and things like val numbers: List[BigDecimal] = List(1.2, 3.2, 0.7, 0.8, 1.1) work really well, wouldn't it be reasonable to have an implicit conversion like implicit def String2BigDecimal(s: String) = BigDecimal(s) available by default which can convert Strings to BigDecimals like this? val numbers: List[BigDecimal] = List("1.2", "3.2", "0.7", "0.8", "1.1") Or am I missing something and Scala resolved all "problems" of Java with using the BigDecimal constructor with a floating point value instead of a String, and BigDecimal(String) is basically not needed anymore in Scala?

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  • How to use Django's filesizeformat

    - by Scott LaPlant
    I have a small app I'm working on where I'm trying to use Django's built in filesizeformat. Currently, the format looks like this: {{ value|filesizeformat }} I understand I need to define this in my view.py file but, I can't seem to figure out how to do that. I've tried to use the syntax below: def filesizeformat(bytes): """ Formats the value like a 'human-readable' file size (i.e. 13 KB, 4.1 MB, 102 bytes, etc). """ try: bytes = float(bytes) except (TypeError,ValueError,UnicodeDecodeError): return u"0 bytes" if bytes < 1024: return ungettext("%(size)d byte", "%(size)d bytes", bytes) % {'size': bytes} if bytes < 1024 * 1024: return ugettext("%.1f KB") % (bytes / 1024) if bytes < 1024 * 1024 * 1024: return ugettext("%.1f MB") % (bytes / (1024 * 1024)) return ugettext("%.1f GB") % (bytes / (1024 * 1024 * 1024)) filesizeformat.is_safe = True I've then replaced 'value' with 'bytes' in the template but, this does not seem to work. Any suggestions?

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  • Grails Unit Tests: Why does this statement fail?

    - by leeand00
    I've developed in Java in the past, and now I'm trying to learn Grails/Groovy using this slightly dated tutorial. import grails.test.* class DateTagLibTests extends TagLibUnitTestCase { def dateTagLib protected void setUp() { super.setUp() dateTagLib = new DateTagLib() } protected void tearDown() { super.tearDown() } void testThisYear() { String expected = Calendar.getInstance().get(Calendar.YEAR) // NOTE: This statement fails assertEquals("the years dont match and I dont know why.", expected, dateTagLib.thisYear()) } } DateTagLibTests.groovy (Note: this TagLibUnitTestCase is for Grails 1.2.1 and not the version used in the tutorial) For some reason the above test fails with: expected:<2010 but was:<2010 I've tried replacing the test above with the following alternate version of the test, and the test passes just fine: void testThisYear() { String expected = Calendar.getInstance().get(Calendar.YEAR) String actual = dateTagLib.thisYear() // NOTE: The following two assertions work: assertEquals("the years don\'t match", expected, actual) assertTrue("the years don\'t match", expected.equals(actual)) } These two versions of the test are basically the same thing right? Unless there's something new in Grails 1.2.1 or Groovy that I'm not understanding. They should be of the same type because the values are both the value returned by Calendar.getInstance().get(Calendar.YEAR)

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  • Where to delete model image?

    - by WesDec
    I have a Model with an image field and I want to be able to change the image using a ModelForm. When changing the image, the old image should be deleted and replaced by the new image. I have tried to do this in the clean method of the ModelForm like this: def clean(self): cleaned_data = super(ModelForm, self).clean() old_profile_image = self.instance.image if old_profile_image: old_profile_image.delete(save=False) return cleaned_data This works fine unless the file indicated by the user is not correct (for example if its not an image), which result in the image being deleted without any new images being saved. I would like to know where is the best place to delete the old image? By this I mean where can I be sure that the new image is correct before deleting the old one?

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  • strange SqlAlchemy update behaviour

    - by Max
    I'm new to SqlAlchemy and Elixir, so I've started from tutorial and tried to create table, insert a record, and then update it as follows: #'elixir_test.py' from elixir import * metadata.bind = "postgresql://myuser:mypwd@localhost:5432/dbname" metadata.bind.echo = True class Movie(Entity): title = Field(Unicode(30)) year = Field(Integer) description = Field(UnicodeText) def __repr__(self): return '<Movie "%s" (%d)>' % (self.title, self.year) and in another file in the same directory: from elixir_test import * setup_all() #create table create_all() Movie(title=u"Blade Runner", year=1982) #add record session.commit() #get records Movie.query.all() #trying to update record and commit changes, BUT... movie = Movie.query.first() movie.year = 1983 session.commit() #now we have two records in our table, one #with year=1982 and one with year=1983 Movie.query.all() What did I missed?

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  • Writing a rails validator with integer

    - by user297008
    I was trying to write a validation for Rails to ensure that a price entered on a form was greater than zero. It works…sort of. The problem is that when I run it, val is turned into an integer, so it thinks that .99 is less than .1. What's going on, and how should I fix the code? class Product < ActiveRecord::Base protected def self.validates_greater_than_zero(*attr_names) validates_each(attr_names) do |record, attr, val| record.errors.add(attr, "should be at least 0.01 (current val = #{val.to_f})") if val.nil? || val < 0.01 end end public validates_presence_of :title, :description, :image_url validates_numericality_of :price validates_greater_than_zero :price end

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  • very quickly getting total size of folder

    - by freakazo
    I want to quickly find the total size of any folder using python. def GetFolderSize(path): TotalSize = 0 for item in os.walk(path): for file in item[2]: try: TotalSize = TotalSize + getsize(join(item[0], file)) except: print("error with file: " + join(item[0], file)) return TotalSize That's the simple script I wrote to get the total size of the folder, it took around 60 seconds (+-5 seconds). By using multiprocessing I got it down to 23 seconds on a quad core machine. Using the Windows file explorer it takes only ~3 seconds (Right click- properties to see for yourself). So is there a faster way of finding the total size of a folder close to the speed that windows can do it? Windows 7, python 2.6 (Did searches but most of the time people used a very similar method to my own) Thanks in advance.

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  • libxml2dom and parsing

    - by Ockonal
    Hello, I have the html-content in some python-variable. Is it possible to use DOM for it? As I understand, libxml2dom is the tool for this. And about question. In my html there is div with id = 'some_needed_block'. In python-script: pageData = someHandler.read() pageDOM = libxml2dom.parseString(pageData, html=1) print pageDOM -> <libxml2dom.Document object at 0x2d160d0> block = pageDOM.getElementById('some_needed_block') print block -> <libxml2dom.Node object at 0xf5d1d0> def collect_text(node): s = "" for child_node in node.childNodes: if child_node.nodeType == child_node.TEXT_NODE: s += child_node.nodeValue else: s += collect_text(child_node) return s collect_text(block) -> for child_node in node.childNodes: -> AttributeError: 'NoneType' object has no attribute 'childNodes'

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  • wxruby - Set max length of ComboBox

    - by Jonas Söderström
    Is is possible to set the Max length of a ComboBox in wxruby? I have looked in the documentation but find nothing http://wxruby.rubyforge.org/doc/combobox.html But if i do my_combobox.methods.sort I get set_max_size and set_min_size in the list. But When I call it my_combobox.set_max_length(100) I only get undefined method 'set_max_length' for #<Wx::ComboBox:0x4d4a914> I've also tried to call it as a private method def my_combobox.max(i) set_max_length(i) end my_combobox.max(100) But with the same result. The issue I want to avoid is that if somebody pastes 6000+ characters in my Combobox the text becomes white.

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  • serializing JSON files with newlines in Python

    - by user248237
    I am using json and jsonpickle sometimes to serialize objects to files, using the following function: def json_serialize(obj, filename, use_jsonpickle=True): f = open(filename, 'w') if use_jsonpickle: import jsonpickle json_obj = jsonpickle.encode(obj) f.write(json_obj) else: simplejson.dump(obj, f) f.close() The problem is that if I serialize a dictionary for example, using "json_serialize(mydict, myfilename)" then the entire serialization gets put on one line. This means that I can't grep the file for entries to be inspected by hand, like I would a CSV file. Is there a way to make it so each element of an object (e.g. each entry in a dict, or each element in a list) is placed on a separate line in the JSON output file? thanks.

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  • implicit argument passing of super from method defined by define_method() is not supported. Specify

    - by jaycode
    Most of you should already know Pragmatic book's "Agile web dev with rails" (third edition). On page 537 - 541 it has "Custom Form Builders" code as follows: class TaggedBuilder < ActionView::Helpers::FormBuilder # <p> # <label for="product_description">Description</label><br/> # <%= form.text_area 'description' %> #</p> def self.create_tagged_field(method_name) define_method(method_name) do |label, *args| @template.content_tag("p" , @template.content_tag("label" , label.to_s.humanize, :for => "#{@object_name}_#{label}") + "<br/>" + super) end end field_helpers.each do |name| create_tagged_field(name) end end This code doesn't work with Ruby 1.9.1. It returns error as follows: implicit argument passing of super from method defined by define_method() is not supported. Specify all arguments explicitly. (ActionView::TemplateError) My question is: What should I change in the code to fix this? Thank you

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  • Nasty deep nested loop in Rails

    - by CalebHC
    I have this nested loop that goes 4 levels deep to find all the image widgets and calculate their sizes. This seems really inefficient and nasty! I have thought of putting the organization_id in the widget model so I could just call something like organization.widgets.(named_scope), but I feel like that's a bad short cut. Is there a better way? Thanks class Organization < ActiveRecord::Base ... def get_image_widget_total total_size = 0 self.trips.each do |t| t.phases.each do |phase| phase.pages.each do |page| page.widgets.each do |widget| if widget.widget_type == Widget::IMAGE total_size += widget.image_file_size end end end end end return total_size end ... end

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  • Calling activateWindow on QDialog sends window to background

    - by Stan
    I am debugging certain application written with C++/Qt4. On Linux it has problems that with certain window managers (gnome-wm/metacity), the main window (based on QDialog) is created in the background (it's not raised). I managed to re-create the scenario using PyQt4 and following code: from PyQt4.QtCore import * from PyQt4.QtGui import * import sys class PinDialog(QDialog): def showEvent(self, event): QDialog.showEvent(self, event) self.raise_() self.activateWindow() if __name__ == "__main__": app = QApplication(sys.argv) widget = PinDialog() app.setActiveWindow(widget) widget.exec_() sys.exit(0) If I remove self.activateWindow() the application works as expected. This seems wrong, since documentation for activateWindow does not specify any conditions under which something like this could happen. My question is: Is there any reason to have activateWindow in showEvent in the first place? If there is some reason, what would be good workaround for focusing issues?

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  • Help! Sikuli unit test can not run

    - by Janet
    Hello, I couldn't run any unit tests either in the window xp? The IDE is functional. I write the simple example unit test script in the editor, as follow: def testHelloWorld(self): print("Hello World!") but no test shows up in the unit test window. When clicking the Run button of the Unit test pane, nothing happens, and the IDE window dissappears, there is no way to get back to it other than restarting the IDE. It had stucked me for several days, that would be preciate if anyone can help me solve this problem! Thank you very much. Janet

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  • How to return a dynamic value from a Mocha mock in Ruby

    - by Vivek
    The gist of my problem is as follows:- I'm writing a Mocha mock in Ruby for the method represented as "post_to_embassy" below. It is not really our concern, for the purpose of describing the problem, what the actual method does. But I need the mock to return a dynamic value. The proc '&prc' below is executing rightly in place of the actual method. But the "with" method in Mocha only allows for boolean values to be returned. So the code below outputs nil. I need it to output the value being passed through orderInfoXml. Does anyone know of an alternate method I can use? require 'rubygems' require 'mocha' include Mocha::API class EmbassyInterface def post_to_embassy(xml) puts "This is from the original class:-" puts xml return xml end end orderInfoXml = "I am THE XML" mock = EmbassyInterface.new prc = Proc.new do |orderXml| puts "This is from the mocked proc:-" puts orderXml orderXml end mock.stubs(:post_to_embassy).with(&prc) mock_result = mock.post_to_embassy(orderInfoXml) p mock_result #p prc.call("asd") output:- This is from the mocked proc:- I am THE XML nil

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  • Sending and receiving async over multiprocessing.Pipe() in Python

    - by dcolish
    I'm having some issues getting the Pipe.send to work in this code. What I would ultimately like to do is send and receive messages to and from the foreign process while its running in a fork. This is eventually going to be integrated into a pexpect loop for talking to interpreter processes. ` from multiprocessing import Process, Pipe def f(conn): cmd = '' if conn.poll(): cmd = conn.recv() i = 1 i += 1 conn.send([42 + i, cmd, 'hello']) if __name__ == '__main__': parent_conn, child_conn = Pipe() p = Process(target=f, args=(child_conn,)) p.start() from pdb import set_trace; set_trace() while parent_conn.poll(): print parent_conn.recv() # prints "[42, None, 'hello']" parent_conn.send('OHHAI') p.join() `

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  • Django, ModelForms, User and UserProfile - not hashing password

    - by IvanBernat
    I'm trying to setup a User - UserProfile relationship, display the form and save the data. When submitted, the data is saved, except the password field doesn't get hashed. Additionally, how can I remove the help_text from the username and password (inherited from the User model)? Full code is below, excuse me if it's too long. Models.py USER_IS_CHOICES = ( ('u', 'Choice A'), ('p', 'Choice B'), ('n', 'Ninja'), ) class UserProfile(models.Model): user = models.ForeignKey(User, unique=True) user_is = models.CharField(max_length=1, choices=USER_IS_CHOICES) Forms.py class UserForm(forms.ModelForm): class Meta: model = User fields = ["first_name", "last_name", "username", "email", "password"] def clean_username(self): username = self.cleaned_data['username'] if not re.search(r'^\w+$', username): raise forms.ValidationError('Username can contain only alphanumeric characters') try: User.objects.get(username=username) except ObjectDoesNotExist: return username raise forms.ValidationError('Username is already taken') class UserProfileForm(forms.ModelForm): class Meta: model = UserProfile fields = ['user_is'] Views.py if request.method == 'POST': uform = UserForm(request.POST) pform = UserProfileForm(request.POST) if uform.is_valid() and pform.is_valid(): user = uform.save() profile = pform.save(commit = False) profile.user = user profile.save() return HttpResponseRedirect('/') else: uform = UserForm() pform = UserProfileForm() variables = RequestContext(request, { 'uform':uform, 'pform':pform }) return render_to_response('registration/register.html', variables)

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  • Filtering model results for Django admin select box

    - by blcArmadillo
    I just started playing with Django today and so far am finding it rather difficult to do simple things. What I'm struggling with right now is filtering a list of status types. The StatusTypes model is: class StatusTypes(models.Model): status = models.CharField(max_length=50) type = models.IntegerField() def __unicode__(self): return self.status class Meta: db_table = u'status_types' In one admin page I need all the results where type = 0 and in another I'll need all the results where type = 1 so I can't just limit it from within the model. How would I go about doing this?

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  • Scala method where type of second parameter equals part of generic type from first parameter

    - by ifischer
    I want to create a specific generic method in Scala. It takes two parameters. The first is of the type of a generic Java Interface (it's from the JPA criteria query). It currently looks like this: def genericFind(attribute:SingularAttribute[Person, _], value:Object) { ... } // The Java Interface which is the type of the first parameter in my find-method: public interface SingularAttribute<X, T> extends Attribute<X, T>, Bindable<T> Now i want to achieve the following: value is currently of type java.lang.Object. But I want to make it more specific. Value has to be the of the same type as the placeholder "_" from the first parameter (and so represents the "T" in the Java interface). Is that somehow possible, and how? BTW Sorry for the stupid question title (any suggestions?)

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  • Django, making a page activate for a fixed time

    - by Hellnar
    Greetings I am hacking Django and trying to test something such as: Like woot.com , I want to sell "an item per day", so only one item will be available for that day (say the default www.mysite.com will be redirected to that item), Assume my urls for calling these items will be such: www.mysite.com/item/<number> my model for item: class Item(models.Model): item_name = models.CharField(max_length=30) price = models.FloatField() content = models.TextField() #keeps all the html content start_time = models.DateTimeField() end_time = models.DateTimeField() And my view for rendering this: def results(request, item_id): item = get_object_or_404(Item, pk=item_id) now = datetime.now() if item.start_time > now: #render and return some "not started yet" error templete elif item.end_time < now: #render and return some "item selling ended" error templete else: # render the real templete for selling this item What would be the efficient and clever model & templete for achieving this ?

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  • Rails - Multiple top level domains and a single session/cookie

    - by Thadius B
    Hello all, I've been struggling with this for quite awhile and haven't been able to find a solution. I need a user to be able to view multiple top level domains with a single login. My understanding is that this needs to be set in environment.rb and called with before_dispatch. This is what I've come up with: require 'activesupport' require 'dispatcher' module ActionController class Dispatcher def set_session_domain ActionController::Base.session_options.update :session_domain => "#{@request.host}" end before_dispatch :set_session_domain end end However, this does not seem to be working when I try and pull the values from session[:session_domain]. Any help is greatly appreciated.

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