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What is the proper way to check if a string is empty in Perl?
...== and != operators are numeric comparison operators. They will attempt to convert both operands to integers before comparing them.
See the perlop man page for more information.
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What is the difference between memmove and memcpy?
...n fact, have overlap (or more generally, access the restricted data from pointer derived from multiple places), the behavior of the program is undefined, weird bugs will happen, and the compiler will usually not warn you about it.
– bdonlan
Feb 9 '15 at 6:34
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How to combine two or more querysets in a Django view?
...ne, since itertools is implemented in C. It also consumes less memory than converting each queryset into a list before concatenating.
Now it's possible to sort the resulting list e.g. by date (as requested in hasen j's comment to another answer). The sorted() function conveniently accepts a generat...
PHP + curl, HTTP POST sample code?
...ooking again at this answer, you can also replace your custom query string converter implementation with http_build_query, just give it the $fields array and it'll output a query string.
– user2629998
Nov 17 '14 at 11:54
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How to construct a set out of list items in python?
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Just note that the order of the elements in a list is generally lost when converting the list to a set since a set is inherently unordered. (One exception in CPython, though, seems to be if the list consists only of non-negative integers, but I assume this is a consequence of the implementation of ...
How to know if other threads have finished?
...ompleted.
How to implement Idea #5? Well, one way is to first create an interface:
public interface ThreadCompleteListener {
void notifyOfThreadComplete(final Thread thread);
}
then create the following class:
public abstract class NotifyingThread extends Thread {
private final Set<T...
How do you dynamically add elements to a ListView on Android?
...; adapter;
//RECORDING HOW MANY TIMES THE BUTTON HAS BEEN CLICKED
int clickCounter=0;
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
adapter=new ArrayAdapter<String>(this,
android.R.la...
return query based on date
...we do it all in one shot: new Date(new Date().getTime()-60*5*1000)
...then convert to ISO string: .toISOString()
new Date(new Date().getTime()-60*5*1000).toISOString() gives us 2017-01-14T08:53:17.586Z
Of course this is a little easier with variables if you're using the node-mongodb-native driver,...
How do I make a checkbox required on an ASP.NET form?
...ge.IsValid Then
'do logic
End If
Sorry for the VB code . . . you can convert it to C# if that is your pleasure. The company I am working for right now requires VB :(
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Pandas every nth row
...
I'd use iloc, which takes a row/column slice, both based on integer position and following normal python syntax.
df.iloc[::5, :]
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