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What is declarative programming? [closed]
...e.
In CSS (used to style HTML pages), if you want an image element to be 100 pixels high and 100 pixels wide, you simply "declare" that that's what you want as follows:
#myImageId {
height: 100px;
width: 100px;
}
You can consider CSS a declarative "style sheet" language.
The browser engine tha...
How can I detect if a file is binary (non-text) in python?
...>>> textchars = bytearray({7,8,9,10,12,13,27} | set(range(0x20, 0x100)) - {0x7f})
>>> is_binary_string = lambda bytes: bool(bytes.translate(None, textchars))
Example:
>>> is_binary_string(open('/usr/bin/python', 'rb').read(1024))
True
>>> is_binary_string(open(...
Does python have a sorted list?
...
+100
Is there a particular reason for your big-O requirements? Or do you just want it to be fast? The sortedcontainers module is pure-Pyt...
Outline radius?
...above, but here's how I did it:
div {
background: #999;
height: 100px;
width: 200px;
border: #999 solid 1px;
border-radius: 10px;
margin: 15px;
box-shadow: 0px 0px 0px 1px #fff inset;
}
<div></div>
No nesting of DIVs or jQuery necessary, Altho for brevi...
Python: Making a beep noise
...import winsound
frequency = 2500 # Set Frequency To 2500 Hertz
duration = 1000 # Set Duration To 1000 ms == 1 second
winsound.Beep(frequency, duration)
The winsound.Beep() can be used wherever you want the beep to occur.
...
How do I use a Boolean in Python?
...fine bool as below:
def __bool__(self):
return self != 0
for bool(100), 100 !=0 will return True. So
bool(100) == True
you can easily check that bool(0) will be False. with this for instances of int class only 0 will return False.
another example= bool([1,2,3])
[1,2,3] has no __bool__() me...
jquery .html() vs .append()
...ng a new jQuery object on every iteration. E.g. the quickest way to create 100 divs with jQuery:
jQuery(Array(101).join('<div></div>'));
There are also issues of readability and maintenance to take into account.
This:
$('<div id="' + someID + '" class="foobar">' + content + ...
Numpy argsort - what is it doing?
...: x = np.random.random(10**5)
In [66]: %timeit using_indexed_assignment(x)
100 loops, best of 3: 9.32 ms per loop
In [70]: %timeit using_rankdata(x)
100 loops, best of 3: 10.6 ms per loop
In [56]: %timeit using_argsort_twice(x)
100 loops, best of 3: 16.2 ms per loop
In [59]: %timeit using_digitiz...
How can I click a button behind a transparent UIView?
...ller with one sub view. the subview takes up the center of the screen with 100 px margins on all sides. We then add a bunch of little stuff to click on inside that subview. We are only using the subview to take advantage of the new frame ( x=0, y=0 inside the subview is actually 100,100 in the paren...
Where are my postgres *.conf files?
...rt number here;
# adjust it in the service file instead.
max_connections = 100 # (change requires restart)
# Note: Increasing max_connections costs ~400 bytes of shared memory per
# connection slot, plus lock space (see max_locks_per_transaction).
#superuser_reserved_connections = 3 # (ch...