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What are the advantages of NumPy over regular Python lists?
..., histograms, etc. And really, who can live without FFTs?
Speed: Here's a test on doing a sum over a list and a NumPy array, showing that the sum on the NumPy array is 10x faster (in this test -- mileage may vary).
from numpy import arange
from timeit import Timer
Nelements = 10000
Ntimeits = 100...
A fast method to round a double to a 32-bit int explained
...s for numbers with absolute value < 2 ^ 51.
This is a little program to test it: ideone.com
#include <cstdio>
int main()
{
// round to nearest integer
printf("%.1f, %.1f\n", rint(-12345678.3), rint(-12345678.9));
// test tie-breaking rule
printf("%.1f, %.1f, %.1f, %.1f\n",...
What does “1 line adds whitespace errors” mean when applying a patch?
...m editing some markdown files of a cloned remote repository, and wanted to test creating and applying patches from one branch to another. However, every time I make any change at all, I get the following message during git apply :
...
Can multiple different HTML elements have the same ID if they're different elements?
...ript, the second ID would then be accessible with document.getElementById (tested on Chrome, FireFox & IE11). You can still select the div using other selection methods, and it's id property will be returned correctly.
Please note this above issue opens a potential security vulnerability in si...
Getting the docstring from a function
...his technique works with builtin functions as well as modules and classes (test help() with objects too - might also work). This makes your python shell an interactive help shell!
– Daren Thomas
Apr 3 '09 at 9:24
...
How to pass payload via JSON file for curl?
...content type header:
$ curl -vX POST http://server/api/v1/places.json -d @testplace.json \
--header "Content-Type: application/json"
But that will only work if the server accepts json input. The .json at the end of the url may only indicate that the output is json, it doesn't necessarily mean tha...
Query a parameter (postgresql.conf setting) like “max_connections”
...tatements:
SELECT current_setting('max_connections');
Related:
How to test my ad-hoc SQL with parameters in Postgres query window
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What is the difference between exit() and abort()?
... It does not call destructors for automatic objects though. So
A a;
void test() {
static A b;
A c;
exit(0);
}
Will destruct a and b properly, but will not call destructors of c. abort() wouldn't call destructors of neither objects. As this is unfortunate, the C++ Standard describes ...
Performance of static methods vs instance methods
... Static methods can't be mocked, If you do TDD or even just unit testing this will hurt your tests a lot.
– trampster
Mar 24 '17 at 10:33
...
ctypes - Beginner
...utorial.
First, write your C library. Here's a simple Hello world example:
testlib.c
#include <stdio.h>
void myprint(void);
void myprint()
{
printf("hello world\n");
}
Now compile it as a shared library (mac fix found here):
$ gcc -shared -Wl,-soname,testlib -o testlib.so -fPIC testlib....