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Python dictionary: Get list of values for list of keys
...ist comprehension seems to be a good way to do this:
>>> [mydict[x] for x in mykeys]
[3, 1]
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Haskell: Converting Int to String
...anizations/standards strongly discourage the use of "show" because of its extreme polymorphism. A type-specific function (or, worst case, wrapper around show) would be helpful.
– Jon Watte
Mar 27 '15 at 16:34
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What are the most interesting equivalences arising from the Curry-Howard Isomorphism?
...rly fascinated by it. It implies that for every programming concept there exists a precise analogue in formal logic, and vice versa. Here's a "basic" list of such analogies, off the top of my head:
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Argparse: Required argument 'y' if 'x' is present
...sets of options.
The simplest way to deal with this would be:
if args.prox and (args.lport is None or args.rport is None):
parser.error("--prox requires --lport and --rport.")
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plot a circle with pyplot
... a circle with matplotlib.pyplot (please no pylab) taking as input center (x,y) and radius r. I tried some variants of this:
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EF LINQ include multiple and nested entities
...Chapters))
.Include(i => i.Lab)
.Single(x => x.Id == id);
Your solution fails because Include doesn't take a boolean operator
Include(i => i.Modules.Select(s => s.Chapters) && i.Lab)
^^^ ^ ...
difference between foldLeft and reduceLeft in Scala
...a special case of foldLeft (which by the way means that you sometimes can express the same thing by using either of them).
When you call reduceLeft say on a List[Int] it will literally reduce the whole list of integers into a single value, which is going to be of type Int (or a supertype of Int, he...
Mapping two integers to one, in a unique and deterministic way
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You're looking for a bijective NxN -> N mapping. These are used for e.g. dovetailing. Have a look at this PDF for an introduction to so-called pairing functions. Wikipedia introduces a specific pairing function, namely the Cantor pairing function:
Thr...
How can I add additional PHP versions to MAMP
...rent version of MAMP that I have only has php 5.2.17 and 5.4.4. I need 5.3.X. Is there a way to add additional versions that can be selected in the MAMP interfaces php preferences? This is for the free version of MAMP, not MAMP PRO.
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MySQL Data - Best way to implement paging?
... two numeric arguments, which must both be nonnegative integer constants (except when using prepared statements).
With two arguments, the first argument specifies the offset of the first row to return, and the second specifies the maximum number of rows to return. The offset of the initial row is 0 ...