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Wrapping a C library in Python: C, Cython or ctypes?
I want to call a C library from a Python application. I don't want to wrap the whole API, only the functions and datatypes that are relevant to my case. As I see it, I have three choices:
...
How to access accelerometer/gyroscope data from Javascript?
... true);
}
The constant factors 2 and 50 are used to "align" the readings from the two latter events with those from the first, but these are by no means precise representations. For this simple "toy" project it works just fine, but if you need to use the data for something slightly more serious, ...
Calling constructor from other constructor in same class
...st also be taken into consideration when chaining constructors:
To borrow from Gishu's answer, a bit (to keep code somewhat similar):
public Test(bool a, int b, string c)
: this(a, b)
{
this.C = c;
}
private Test(bool a, int b)
{
this.A = a;
this.B = b;
}
If we change the evalut...
What's the best way to store co-ordinates (longitude/latitude, from Google Maps) in SQL Server?
....
In MySQL save it as FLOAT( 10, 6 )
This is the official recommendation from the Google developer documentation.
CREATE TABLE `coords` (
`lat` FLOAT( 10, 6 ) NOT NULL ,
`lng` FLOAT( 10, 6 ) NOT NULL ,
) ENGINE = MYISAM ;
...
List comprehension vs. lambda + filter
...ue in Python. Even though Guido considered removing map, filter and reduce from Python 3, there was enough of a backlash that in the end only reduce was moved from built-ins to functools.reduce.
Personally I find list comprehensions easier to read. It is more explicit what is happening from the exp...
What is the difference between include and extend in Ruby?
...e methods)
include is a private method, because it's intended to be called from within the container class/module.
However, modules very often override include's behavior by monkey-patching the included method. This is very prominent in legacy Rails code. more details from Yehuda Katz.
Further d...
Determine if 2 lists have the same elements, regardless of order? [duplicate]
...ermine if 2 lists have the same elements, regardless of order?
Inferring from your example:
x = ['a', 'b']
y = ['b', 'a']
that the elements of the lists won't be repeated (they are unique) as well as hashable (which strings and other certain immutable python objects are), the most direct and co...
CSS background-image - What is the correct usage?
...
The path can either be full or relative (of course if the image is from another domain it must be full).
You don't need to use quotes in the URI; the syntax can either be:
background-image: url(image.jpg);
Or
background-image: url("image.jpg");
However, from W3:
Some characters ap...
Why use AJAX when WebSockets is available?
...curity, parallelism, error handling, etc). Regarding performance, although from-scratch raw large file transfer speed would be similar, browsers have had years to finely tune caching of web content (much of which applies to AJAX requests) so in practice, switching from AJAX to WebSockets is unlikely...
Copying PostgreSQL database to another server
...and psql is for restoring. So, the first command in this answer is to copy from local to remote and the second one is from remote to local. More -> https://www.postgresql.org/docs/9.6/app-pgdump.html
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