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What is Android keystore file, and what is it used for?
This is a general question, but particularly I am interested in it's use for Android. What is a keystore file, and what is it used for?
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How to use the 'og' (Open Graph) meta tag for Facebook share
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Use:
<!-- For Google -->
<meta name="description" content="" />
<meta name="keywords" content="" />
<meta name="author" content="" />
<meta name="copyright" content="" />
<meta name="application-name" cont...
Sort a list by multiple attributes?
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A key can be a function that returns a tuple:
s = sorted(s, key = lambda x: (x[1], x[2]))
Or you can achieve the same using itemgetter (which is faster and avoids a Python function call):
import operator
s = sorted(s, key = operator.itemgetter(1, 2))
And notice that here...
Is there a benefit to defining a class inside another class in Python?
...-off, which will never be used outside the definition of the outer class. For example to use a metaclass, it's sometimes handy to do
class Foo(object):
class __metaclass__(type):
....
instead of defining a metaclass separately, if you're only using it once.
The only other time I've ...
How to optimize for-comprehensions and loops in Scala?
...fast as Java. I'm revisiting some Project Euler problems in Scala that I originally tackled in Java. Specifically Problem 5: "What is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20?"
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Capistrano - clean up old releases
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May be worth noting that even if the find+rm command fails to remove some files the task seems to silently "succeed" when called via the after hook. Calling it directly shows the errors... I realized this when I was starting to run o...
Ruby: How to iterate over a range, but in set increments?
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See http://ruby-doc.org/core/classes/Range.html#M000695 for the full API.
Basically you use the step() method. For example:
(10..100).step(10) do |n|
# n = 10
# n = 20
# n = 30
# ...
end
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Breaking loop when “warnings()” appear in R
...issue:
I am running a loop to process multiple files. My matrices are enormous and therefore I often run out of memory if I am not careful.
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How to create major and minor gridlines with different linestyles in Python
...y using matplotlib.pyplot to create graphs and would like to have the major gridlines solid and black and the minor ones either greyed or dashed.
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What is a 'SAM type' in Java?
...To summarize the link Jon posted1 in case it ever goes down, "SAM" stands for "single abstract method", and "SAM-type" refers to interfaces like Runnable, Callable, etc. Lambda expressions, a new feature in Java 8, are considered a SAM type and can be freely converted to them.
For example, with an ...