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Convert RGBA PNG to RGB with PIL
... I found while building RGBA -> JPG + BG support for sorl thumbnails.
from PIL import Image
png = Image.open(object.logo.path)
png.load() # required for png.split()
background = Image.new("RGB", png.size, (255, 255, 255))
background.paste(png, mask=png.split()[3]) # 3 is the alpha channel
ba...
Should “node_modules” folder be included in the git repository
...ur app anymore.
Or you have your private modules which are not accessible from the internet and you can't build your app on the Internet. Or maybe you don't want to depend on your final build on npm service for some reasons.
You can find pros and cons in this Addy Osmani article (although it is ab...
Understanding PrimeFaces process/update and JSF f:ajax execute/render attributes
...n errors on other input components are preventing the ajax listener method from being executed.
Then there's the @all. This has no special effect in process attribute, but only in update attribute. A process="@all" behaves exactly the same as process="@form". HTML doesn't support submitting multiple...
What do I use for a max-heap implementation in Python?
...
If you then want to pop elements, use:
heapq.heappop(minheap) # pop from minheap
heapq._heappop_max(maxheap) # pop from maxheap
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Wait for a process to finish
...acOS, for example, implements BSD's kqueue), but not all make it available from command-line.
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Divide a number by 3 without using *, /, +, -, % operators
.../ 3 = a/4 + a/16 + a/64 + (..). Dividing by 4 is where the bit shift comes from. The last check on num==3 is needed because we've only got integers to work with.
– Yorick Sijsling
Jul 30 '12 at 12:40
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Extract TortoiseSVN saved password
...dentials are saved in subdirectories of %APPDATA%\Subversion\auth\. Listed from this previous answer they are:
svn.simple contains credentials for basic authentication (username/password)
svn.ssl.server contains SSL server certificates
svn.username contains credentials for username-only authentica...
sys.argv[1] meaning in script
...the arguments (as separated by spaces) on the command-line. The name comes from the C programming convention in which argv and argc represent the command line arguments.
You'll want to learn more about lists and strings as you're familiarizing yourself with Python, but in the meantime, here are a f...
How does lucene index documents?
... system himself. Note that by using Skip-Lists, the index can be traversed from one hit to another, making things like set and, particularly, range queries possible (much like B-Trees). And the Wikipedia entry on indexing Skip-Lists also explains why Lucene's Skip-List implementation is called a mul...
What is the effect of extern “C” in C++?
...ared has internal linkage, and so does not have a language linkage
Linkage from C++ to objects defined in other languages and to objects defined in C++ from other languages is implementation-defined and language-dependent. Only where the object layout strategies of two language implementations are s...