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linq query to return distinct field values from a list of objects
... The second form seems to use an overload of Distinct which doesn't exist as far as I'm aware.
– Jon Skeet
Jun 3 '11 at 18:56
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Update built-in vim on Mac OS X
...to simply download the latest MacVim which comes with a very complete vim executable and use it in Terminal.app like so.
alias vim='/Applications/MacVim.app/Contents/MacOS/Vim' # or something like that, YMMV
share
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Why are unnamed namespaces used and what are their benefits?
...d the design. The project makes frequent use of unnamed namespaces. For example, something like this may occur in a class definition file:
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How to check task status in Celery?
...en from .delay()) and ask the celery instance afterwards about the state:
x = method.delay(1,2)
print x.task_id
When asking, get a new AsyncResult using this task_id:
from celery.result import AsyncResult
res = AsyncResult("your-task-id")
res.ready()
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How to use R's ellipsis feature when writing your own function?
... for defining functions that can take a variable number of arguments. For example, the function data.frame takes any number of arguments, and each argument becomes the data for a column in the resulting data table. Example usage:
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RGB to hex and hex to RGB
How to convert colors in RGB format to hex format and vice versa?
50 Answers
50
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Convert nested Python dict to object?
...a dict with some nested dicts and lists (i.e. javascript-style object syntax).
39 Answers
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Nested defaultdict of defaultdict
...ber of levels:
def rec_dd():
return defaultdict(rec_dd)
>>> x = rec_dd()
>>> x['a']['b']['c']['d']
defaultdict(<function rec_dd at 0x7f0dcef81500>, {})
>>> print json.dumps(x)
{"a": {"b": {"c": {"d": {}}}}}
Of course you could also do this with a lambda, but ...
What does |= (ior) do in Python?
...R, binary operation
In most cases, it is related to the | operator. See examples below.
Sets
For example, the union of two assigned sets s1 and s2 share the following equivalent expressions:
>>> s1 = s1 | s12 # 1
>>> s1 |= s2 ...
iPhone UIButton - image position
I have a UIButton with text "Explore the app" and UIImage (>)
In Interface Builder it looks like:
15 Answers
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