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Chaining multiple filter() in Django, is this a bug?
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The way I understand it is that they are subtly different by design (and I am certainly open for correction): filter(A, B) will first filter according to A and then subfilter according to B, while filter(A).filter(B) will return a row that matche...
PHP array_filter with arguments
...comments on the documentation page. The idea is that you create an object with the desired state ($num) and the callback method (taking $i as an argument):
class LowerThanFilter {
private $num;
function __construct($num) {
$this->num = $num;
}
fu...
How do I create a constant in Python?
...annot declare a variable or value as constant in Python. Just don't change it.
If you are in a class, the equivalent would be:
class Foo(object):
CONST_NAME = "Name"
if not, it is just
CONST_NAME = "Name"
But you might want to have a look at the code snippet Constants in Python by Alex Martell...
how to change any data type into a string in python
...= repr(myvariable) # '4'
This is called "conversion" in python, and is quite common.
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How do I mock an open used in a with statement (using the Mock framework in Python)?
How do I test the following code with unittest.mock :
8 Answers
8
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How do I filter query objects by date range in Django?
...cts.filter(date__year='2011',
date__month='01')
Edit
As Bernhard Vallant said, if you want a queryset which excludes the specified range ends you should consider his solution, which utilizes gt/lt (greater-than/less-than).
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How can I tell gcc not to inline a function?
...ep such calls from being
optimized away, put
asm ("");
Use it like this:
void __attribute__ ((noinline)) foo()
{
...
}
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Best practice for Django project working directory structure
I know there is actually no single right way. However I've found that it's hard to create a directory structure that works well and remain clean for every developer and administrator. There is some standard structure in most projects on github. But it does not show a way to organize another files an...
C++ Lock-free Hazard Pointer（冒险指针） - C/C++ - 清泛网 - 专注C/C++及内核技术
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struct HazardPointer {
public:
class Holder {
public:
explicit Holder(HazardPointer<T> *pointer) : pointer_(pointer) {}
Holder(const HazardPointer &) = delete;
~Holder() { pointer_->Release(); }
T *get() const { return pointer_->target_.load(std::memory_order_acquire); ...
No ConcurrentList in .Net 4.0?
...ed to see the new System.Collections.Concurrent namespace in .Net 4.0, quite nice! I've seen ConcurrentDictionary , ConcurrentQueue , ConcurrentStack , ConcurrentBag and BlockingCollection .
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