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Algorithm to return all combinations of k elements from n
...an iterator and (a more general) folder overall combinations.
They are as fast as possible, having the complexity O(nCk). The memory consumption is bound by k.
We will start with the iterator, which will call a user provided function for each combination
let iter_combs n k f =
let rec iter v s...
Serializing a list to JSON
... and Deserialize JSON Data. There are limitations but it's good enough and fast enough if you have basic needs and don't want to add Yet Another Library to your project.
The following code serializea a list to the console output stream. As you see it is a bit more verbose than Json.NET and not type...
What are the differences between json and simplejson Python modules?
...date Python. The built-in (great plus!!!) Json library in Python 2.7 is as fast as simplejson and has less refused-to-be-fixed unicode bugs. See answer stackoverflow.com/a/16131316/78234
– Tal Weiss
May 13 '13 at 13:48
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Why does `a == b or c or d` always evaluate to True?
... of the two the second should be preferred as it's easier to read and also faster:
>>> import timeit
>>> timeit.timeit('name == "Kevin" or name == "Jon" or name == "Inbar"', setup="name='Inbar'")
0.4247764749999945
>>> timeit.timeit('name in {"Kevin", "Jon", "Inbar"}', set...
Why is printing to stdout so slow? Can it be sped up?
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How can it be that writing to physical disk is WAY faster than writing to the "screen" (presumably an all-RAM op), and is effectively as fast as simply dumping to the garbage with /dev/null?
Congratulations, you have just discovered the importance of I/O buffering. :-)
The...
How to sort objects by multiple keys in Python?
... the Timsort algorithm used in (at least) CPython, this is actually rather fast in practice.
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Return multiple columns from pandas apply()
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Use apply and zip will 3 times fast than Series way.
def sizes(s):
return locale.format("%.1f", s / 1024.0, grouping=True) + ' KB', \
locale.format("%.1f", s / 1024.0 ** 2, grouping=True) + ' MB', \
locale.format("%.1f", s / 1024....
Get last n lines of a file, similar to tail
... efficient way of doing what has been asked, as well as being an extremely fast way of doing it (You don't have to load the entire file into memory). @Shabbyrobe
– earthmeLon
Nov 21 '14 at 22:53
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Why does Clojure have “keywords” in addition to “symbols”?
...ds are symbolic identifiers that evaluate to themselves. They provide very fast equality tests...
Symbols are identifiers that are normally used to refer to something else. They can be used in program forms to refer to function parameters, let bindings, class names and global vars...
Keywords...
How to sort a dataframe by multiple column(s)
...)),]
That isn't what you meant but you didn't spot it because you did it fast and it's nestled on a page of similar code. The code doesn't fall over (no warning and no error) because R thinks it is what you meant. You'd hope whoever reads your report spots it, but maybe they don't. If you work wit...