Not necessarily the most superior way performance/Pythonicity wise but it’s simple to remember and short:
list = [1, 2, 3, 4, 5, 6, ...] pairs = zip(list[::2], list[1::2]) for pair in pairs: # do stuff |
pair will be (1, 2), (3, 4) etc.
The 2 list slices turn the original into odd/even sets and zip merges them
import sys import PySide sys.modules['PyQt4'] = PySide import Image import ImageQt image = Image.open(blah) # manipulate image QPixmap(ImageQt.ImageQt(image)) |
ImageQt is a class provided by PIL that is hardcoded to use PyQt4. This lets you switch the module used by ‘PyQt4′
Source
If you wanted to move your WinRT project to support Windows Phone 7.5, you’ll rejoice at the recent news that Microsoft’s Microsoft.bcl.Async package in Nuget that allows using Async keywords and Task class but in the end, you really used them in WinRT because HttpClient class had a GetAsync method which is not available outside WinRT.
Worry not, the Microsoft.bcl.Async package comes with a Microsoft.Threading.Tasks.Extensions assembly that if you look inside, includes:
public static System.Threading.Tasks.Task<webresponse>GetResponseAsync(this System.Net.WebRequest source) Member of AsyncExtensions</webresponse> |
Which means you can use System.Net.WebRequest in its place and it supports Task/Async.
So you can do something like:
WebRequest request = WebRequest.Create(uri); await request.GetResponseAsync(); |
<visualstate x:Name="MouseOver"></visualstate> |
doesn’t work in WinRT? Try
<visualstate x:Name="PointerOver"></visualstate> |
since it’s different from since Silverlight
You’ve now made your app and tested it on desktop and want to use the same code for your developer unlocked the tablet. Until there’s an ARM version of Visual Studio, here’s what you can do. The basic process would be to set up a Remote Debugger service on your tablet and from a desktop on the same subnet, run on it directly. This assumes you have a development tablet device and a desktop running the same user (who also has admin rights) Read More…
Sharing on “Metro style”/”Windows Store” app is a bit different from what we used to. Instead of invoking it directly in code, Microsoft encourages us to use the centralised “charm” bar where we would then implement a page event handler to fill in details to share.
To personalise share details, we would fill a DataPackage that would then be used across various media such as email or message or other apps. Read More…
You have a ModelForm based on a Model with a non-optional ForeignKey field. You already connected it via something like
instance = SomeClass(someRelatedObject = someObject) form = SomeForm(request.POST, instance = instance) |
but form.is_valid() is still giving you an error saying someRelatedObject can’t be null. One possible solution is to check your SomeClass’s definition of someRelatedObject. Try putting ‘editable = False’ in your ForeignKey constructor and it may solve your problem.
Simple solution. Many posts online points to replacing fonts etc but with Eden, the included Arial has unicode support. You just had a shitty theme with custom non-unicode font. Just go to the skinning section of your theme (skins can change the hierarchy) and change the font from default to Arial. Easy!
Definitely not an exhaustive fix but did fix it for me on a Zotac ID80 with Nvidia GT 520m. Disable composite with
sudo nvidia-xconfig --no-composite |
It’s a very obscure note on the XBMC’s unreachable wiki. It mentions that XBMC is not compatible with Compiz and has a link to a german site that among other things, has the code above. It works.
Sometimes you can’t avoid using HTTPS right starting from development (such as for developing Facebook canvas applications). You can setup Apache on your local machine and go through a bunch of trouble setting up your domain and setting up the certificate etc but there’s an easy way of using Django’s python manage.py runserver to work with HTTPS.
This can be done with stunnel that lets the Facebook server and stunnel on your machine communicate in SSL and stunnel turns around to communicate with Python in HTTP. First install stunnel. For instance in Mac OS X:
brew install stunnel |
When you put a Facebook Like button on your website or Facebook App, by default, a comment box appears but if you’re working in a small div with no overflow (such as to show no counter box), having the comment box appear might hide everything. To ‘disable’ it, put the following CSS:
.fb_edge_comment_widget { display: none !important; } |
In the properties tab or attributes of XAML, the level of control you can have over Silverlight controls is rather limited. You can’t change their behaviours in different states. To actually control it, you need to create a ControlTemplate. Sounds innocent enough but it’s basically forcing the user to redefine a user control and recreate the button or the textbox manually from their constituents (border, grid etc) which is extremely labour intensive if all you want to do is just change say the colour of the border when it is selected.
Instead of recreating the control from scratch, you can let Microsoft Expression Blend do some part of that job for you. Style your control to your liking as much as you can in Blend and then right-click to select Edit Template -> Edit a Copy. Then you get to define a key. Think of it like a CSS class and name it as you wish. Define it in the Application (App.xaml) so you can use it everywhere in your application. This will then generate a ControlTemplate for you based on the instance of control you selected Edit Template on. Read More…
The Web API is a good step catching up to Ruby on Rails and Django but isn’t nearly as well documented. If your posted data doesn’t match exactly a model object, it’s hard to figure out how to just get all the data out and process it yourself. Inside the
public void Post()
tag, you can have access to a Request member from ApiController and with it, you can do
JsonObject input = Request.Content.ReadAsAsync().Result;
to get the data out. A key detail is that if you do so, you cannot put any parameters in the Post method declaration or it will try to bind it to which ever parameter type you specified.
If you can’t see your Windows 7 VM from Mac OS X in bridged mode, the problem could be the location set on your Windows 7 OS. It’s possible that with bridged mode, Windows can’t figure out the network time and default to ‘Unidentified network’ which is the same as if you chose Public and put it into a safer mode than if you chose Home or Work. Unfortunately if it were the case, you can’t really change the network type. If your VM is going to stay home and never wonder into the dangerous wildland, you can just set the ‘Unidentified network’ to be treated as a private network via:
Start -> secpol.msc
Network List Manager Policies -> Unidentified Networks
Select Private
Then you’re done!
Great article about the elusive ‘Pythonic’ coding:
http://artifex.org/~hblanks/talks/2011/pep20_by_example.html