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What are all the differences between src and data-src attributes?
...src and data-src have nothing in common, except that they are both allowed by HTML5 CR and they both contain the letters src. Everything else is different.
The src attribute is defined in HTML specs, and it has a functional meaning.
The data-src attribute is just one of the infinite set of data-* ...
Use numpy array in shared memory for multiprocessing
...defines the number of processes (the number of available CPU cores is used by default). M is the number of times f() function is called.
– jfs
Jul 16 '18 at 13:08
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lenses, fclabels, data-accessor - which library for structure access and mutation is better
...at a lens can provide a state monad homomorphism between two state monads, by definining lenses directly as such monad homomorphisms.
If it actually bothered to provide a type for its lenses, they would have a rank-2 type like:
newtype Lens s t = Lens (forall a. State t a -> State s a)
As a r...
Javascript checkbox onChange
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function calc()
{
if (document.getElementById('xxx').checked)
{
document.getElementById('totalCost').value = 10;
} else {
calculate();
}
}
HTML
<input type="checkbox" id="xxx" name="xxx" onclick="calc();"/>
...
Java: int array initializes with nonzero elements
According to the JLS, an int array should be filled by zeros just after initialization. However, I am faced with a situation where it is not. Such a behavior occurs first in JDK 7u4 and also occurs in all later updates (I use 64-bit implementation). The following code throws exception:
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Excel RTD(Excel Real-Time Data)实时刷新数据技术 - C/C++ - 清泛网 - 专注C/C++及内核技术
... xlRTDUpdate = CallbackObject;
//2000 millisecond by default.
int intv = 2000;
//'Create the time with a 5000 millisecond interval.
tmrTimer = new Timer(intv);
tmrTimer.AutoReset = true;
tmrTimer.Elapsed +=...
How do you change text to bold in Android?
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Here is the solution
TextView questionValue = (TextView) findViewById(R.layout.TextView01);
questionValue.setTypeface(null, Typeface.BOLD);
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Create empty queryset by default in django form fields
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You can have an empty queryset by doing this:
MyModel.objects.none()
Although i don't know how are you going to use that form, you can put that as your field's queryset in order to get what you need...
You can find more information here
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Best practices for SQL varchar column length [closed]
...or almost all DBMS, the actual storage that is required is only determined by the number of characters you put into it, not the max length you define. So from a storage point of view (and most probably a performance one as well), it does not make any difference whether you declare a column as VARCHA...
Random string generation with upper case letters and digits
...sn't create the list in memory, but generates the elements on the fly, one by one (more about this here).
Instead of asking to create 'n' times the string elem, we will ask Python to create 'n' times a random character, picked from a sequence of characters:
>>> random.choice("abcde")
'a'
...