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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()
...
Convert nested Python dict to object?
...a dict with some nested dicts and lists (i.e. javascript-style object syntax).
39 Answers
...
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 ...
iPhone UIButton - image position
I have a UIButton with text "Explore the app" and UIImage (>)
In Interface Builder it looks like:
15 Answers
...
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 ...
How to get first element in a list of tuples?
...st(unzipped[0])
[1, 2]
Edit (@BradSolomon):
The above works for Python 2.x, where zip returns a list.
In Python 3.x, zip returns an iterator and the following is equivalent to the above:
>>> print(list(list(zip(*inpt))[0]))
[1, 2]
...
How do I use vim registers?
...y know of one instance using registers is via Ctrl R * whereby I paste text from a clipboard.
16 Answers
...
C# 4.0 optional out/ref arguments
...ication, section 21.1:
Formal parameters of constructors, methods, indexers and delegate types can be declared optional:
fixed-parameter:
attributesopt parameter-modifieropt type identifier default-argumentopt
default-argument:
= expression
A fixed-parameter ...
How do I extract a sub-hash from a hash?
...
If you specifically want the method to return the extracted elements but h1 to remain the same:
h1 = {:a => :A, :b => :B, :c => :C, :d => :D}
h2 = h1.select {|key, value| [:b, :d, :e, :f].include?(key) } # => {:b=>:B, :d=>:D}
h1 = Hash[h1.to_a - h2.to_a...
Determining memory usage of objects? [duplicate]
...time ago I stole this little nugget from here:
sort( sapply(ls(),function(x){object.size(get(x))}))
it has served me well
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