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optional local variables in rails partial templates: how do I get out of the (defined? foo) mess?
...d used the following syntax in my partial templates to set default values for local variables if a value wasn't explicitly defined in the :locals hash when rendering the partial --
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Rails: How to reference images in CSS within Rails 4
...cess these helpers if your stylesheet file extensions are either .css.scss or .css.sass.
Image specific helper:
background-image: image-url("logo.png")
Agnostic helper:
background-image: asset-url("logo.png", image)
background-image: asset-url($asset, $asset-type)
Or if you want to embe...
Deep copying an NSArray
... then this approach will not suffice. Please see the other answers here for that.
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Threading pool similar to the multiprocessing Pool?
Is there a Pool class for worker threads , similar to the multiprocessing module's Pool class ?
9 Answers
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How to pick a new color for each plotted line within a figure in matplotlib?
I'd like to NOT specify a color for each plotted line, and have each line get a distinct color. But if I run:
7 Answers
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How can I view all historical changes to a file in SVN
...the changes between the two specified revisions. What I'd like is a diff for every revision that changed the file. Is such a command available?
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Make $JAVA_HOME easily changable in Ubuntu [closed]
In Ubuntu, I'd like to switch my JAVA_HOME environment variable back and forth between Java 5 and 6.
8 Answers
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What does asterisk * mean in Python? [duplicate]
...
See Function Definitions in the Language Reference.
If the form *identifier is
present, it is initialized to a tuple
receiving any excess positional
parameters, defaulting to the empty
tuple. If the form **identifier is
present, it is initialized to a new
dictionary receiv...
Plot two histograms on single chart with matplotlib
...
Here you have a working example:
import random
import numpy
from matplotlib import pyplot
x = [random.gauss(3,1) for _ in range(400)]
y = [random.gauss(4,2) for _ in range(400)]
bins = numpy.linspace(-10, 10, 100)
pyplot.hist(x, bins, alp...
Filter dict to contain only certain keys?
...Constructing a new dict:
dict_you_want = { your_key: old_dict[your_key] for your_key in your_keys }
Uses dictionary comprehension.
If you use a version which lacks them (ie Python 2.6 and earlier), make it dict((your_key, old_dict[your_key]) for ...). It's the same, though uglier.
Note that t...