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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...
How do I escape spaces in path for scp copy in Linux?
I'm new to linux, I want to copy a file from remote to local system... now I'm using scp command in linux system.. I have some folders or files names are with spaces, when I try to copy that file, it shows the error message: "No such file or directory"
...
What is a smart pointer and when should I use one?
...that std::unique_ptr instances cannot be copied. This prevents the pointer from being deleted multiple times (incorrectly). You can, however, pass references to it around to other functions you call.
std::unique_ptrs are useful when you want to tie the lifetime of the object to a particular block o...
Difference between .success() and .complete()?
...ays when the request is complete. (no matter, it is success/error response from server.)
So,
when there is success response from server: complete() and success() is called.
when there is error response from server: complete() and error() is called.
For what purpose you can use complete(): s...
Search for executable files using find command
... also allow -not); note that \! is used in the examples so as to protect ! from shell history expansions
-a for AND (GNU find and BSD find also allow -and)
-o for OR (GNU find and BSD find also allow -or)
The examples use symbolic modes, because they're easier to read and remember.
With mode pre...
Check if a given key already exists in a dictionary
...for any key you can either use dict.setdefault() repeatedly or defaultdict from the collections module, like so:
from collections import defaultdict
d = defaultdict(int)
for i in range(100):
d[i % 10] += 1
but in general, the in keyword is the best way to do it.
...
Autolayout - intrinsic size of UIButton does not include title insets
...t all in Interface Builder as follows.
Intrinsic button width is derived from the title width plus the icon width plus the left and right content edge insets.
If a button has both an image and text, they’re centered as a group, with no padding between.
If you add a left content inset, it’s cal...
What are WSGI and CGI in plain English?
...
From a totally step-back point of view, Blankman, here is my "Intro Page" for Web Services Gateway Interface:
PART ONE: WEB SERVERS
Web servers serve up responses. They sit around, waiting patiently, and then with no warnin...
Git pre-push hooks
...er push in another thread, if the first one push times out, the second one from another thread works for me. If either first and second succeeds, then the first pushes changes, and the second pushes nothing. The trick is that i had some argument added, which bypasses unit tests(which was used for th...
What is the difference between Forking and Cloning on GitHub?
...he two projects (and other forks).
You can still request that people pull from your cloned repository, even if you don't use fork -- but you'd have to deal with making it publicly available yourself. Or send the developers patches (see git format-patch) that they can apply to their trees.
...