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Add column with constant value to pandas dataframe [duplicate]
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How to create a sequence of integers in C#?
...rhaps you want somthing like.
using System.Threading;
private static int orderNumber = 0;
int Seq()
{
return Interlocked.Increment(ref orderNumber);
}
When you call Seq() it will return the next order number and increment the counter.
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When should I make explicit use of the `this` pointer?
...w to treat i, since it may or may not exist in all instantiations of A. In order to tell it that i is indeed a member of A<T>, for any T, the this-> prefix is required.
Note: it is possible to still omit this-> prefix by using:
template<class T>
struct B : A<T> {
using...
Can't use method return value in write context
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empty() needs to access the value by reference (in order to check whether that reference points to something that exists), and PHP before 5.5 didn't support references to temporary values returned from functions.
However, the real problem you have is that you use empty() at ...
file_put_contents(meta/services.json): failed to open stream: Permission denied
...lving the problem! Do we need to do something before/after Your command in order to reverse the chmod 777 consequences?
– Aleksandar
Apr 18 '18 at 12:53
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In an array of objects, fastest way to find the index of an object whose attributes match a search
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Maybe you would like to use higher-order functions such as "map".
Assuming you want search by 'field' attribute:
var elementPos = array.map(function(x) {return x.id; }).indexOf(idYourAreLookingFor);
var objectFound = array[elementPos];
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Windows path in Python
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ActiveModel::ForbiddenAttributesError when creating new user
...put by seeing if your controller will respond to the following methods (in order):
create_params
<model_name>_params such as article_params (this is
the default convention in rails for naming your param method)
resource_params (a generically named method you could specify in
each controller)...
What does the plus sign do in '+new Date'
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Generating file to download with Django
... urllib
def random_header_image(request):
header = PageHeader.objects.order_by('?')[0]
image = StringIO(file(header.image.path, "rb").read())
mimetype = mimetypes.guess_type(os.path.basename(header.image.name))[0]
return HttpResponse(image.read(), mimetype=mimetype)
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