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Fastest way to list all primes below N
...ratosthenes,
sundaram3,
sieve_wheel_30,
ambi_sieve (requires numpy)
primesfrom3to (requires numpy)
primesfrom2to (requires numpy)
Many thanks to stephan for bringing sieve_wheel_30 to my attention.
Credit goes to Robert William Hanks for primesfrom2to, primesfrom3to, rwh_primes, rwh_primes1, and ...
Do Git tags only apply to the current branch?
...anches - they only ever identify a commit.
That commit can be pointed to from any number of branches - i.e., it can be part of the history of any number of branches - including none.
Therefore, running git show <tag> to see a tag's details contains no reference to any branches, only the ID ...
Merging 2 branches together in GIT
...B
# hack hack
$ git commit -am "commit on branch B"
# create new branch C from A
$ git checkout -b C A
# hack hack
$ git commit -am "commit on branch C"
# go back to branch A
$ git checkout A
# hack hack
$ git commit -am "commit on branch A"
so now there are three separate branches (namely A B a...
How to import module when module name has a '-' dash or hyphen in it?
... = __import__('foo-bar')
globals().update(vars(tmp))
---- main.py ----
from foo_proxy import *
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How to remove illegal characters from path and filenames?
I need a robust and simple way to remove illegal path and file characters from a simple string. I've used the below code but it doesn't seem to do anything, what am I missing?
...
What is the scope of variables in JavaScript?
...ation Styles
var
Identifiers declared using var have function scope, apart from when they are declared directly in the global context, in which case they are added as properties on the global object and have global scope. There are separate rules for their use in eval functions.
let and const
Identi...
'printf' vs. 'cout' in C++
...rintf is C (however, you can use it in C++, just like almost anything else from C). Now, I'll be honest here; both printf and std::cout have their advantages.
Real differences
Extensibility
std::cout is extensible. I know that people will say that printf is extensible too, but such extension is n...
Is key-value observation (KVO) available in Swift?
...
Since this wasn't clear to me from @fabb's comment: use the dynamic keyword for any properties inside of a class you'd like to be KVO compliant (not the dynamic keyword on the class itself). This worked for me!
– Tim Arnold
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Does return stop a loop?
...
@o-o Sort of true. return still returns from the current iteration of the function callback, in its own scope, but would not be expected to break from the entire calling method forEach(). So it isn't returning from the loop itself, but it is returning from the call...
What is the best way to use a HashMap in C++?
... a hash table-based container, almost all implementations include hash_map from the SGI STL in some form or another.
– James McNellis
Aug 26 '10 at 18:27
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