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Check whether a path is valid in Python without creating a file at the path's target
...file name).
I need to test if the file-name is a valid, e.g. if the file-system will allow me to create a file with such a name.
The file-name has some unicode characters in it.
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Python - How to sort a list of lists by the fourth element in each list? [duplicate]
... would like to sort the following list of lists by the fourth element (the integer) in each individual list.
2 Answers
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How to throw a C++ exception
...
Simple:
#include <stdexcept>
int compare( int a, int b ) {
if ( a < 0 || b < 0 ) {
throw std::invalid_argument( "received negative value" );
}
}
The Standard Library comes with a nice collection of built-in exception objects you c...
How to sort a List alphabetically using Object name field
...sort(list, new Comparator<Campaign>() {
@Override
public int compare(final Campaign object1, final Campaign object2) {
return object1.getName().compareTo(object2.getName());
}
});
}
Or if you are using Java 1.8
list
.stream()
.sorted((object1, object2) ->...
Is it Linq or Lambda?
... hood. The first is meant to be more user friendly/easier and the compiler converts it to method calls behind the scenes. They should work the same for any given query though of course the compiler may choose a sligthly different interpretation of a complicated linq query than you would when convert...
C# List of objects, how do I get the sum of a property
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Is this quicker than foreach out of interest?
– Coops
Feb 4 '13 at 14:08
4
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Is iterating ConcurrentHashMap values thread safe?
...p = new ConcurrentHashMap<String, String>();
private final static int MAP_SIZE = 100000;
public static void main(String[] args)
{
new ConcurrentMapIteration().run();
}
public ConcurrentMapIteration()
{
for (int i = 0; i < MAP_SIZE; i++)
{
map.put("key" + i, ...
Initialize a long in Java
... @Pluto 0x20000000L would work but can still be represented by int (a 32-bit integer), thus 0x20000000 would work just as well. 0x200000000L breaks that boundary, making the trailing L necessary.
– user149408
Apr 7 '18 at 15:55
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Is there a Null OutputStream in Java?
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Awesome, thanks for pointing that out! But "since Java 11"? I think Java 11 has only been out for one week.
– Brandon Yarbrough
Oct 5 '18 at 21:04
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Python: Why is functools.partial necessary?
...n eyesore anomaly in Python...
He was repentant of ever having accepted it into Python whereas planned to remove it from Python 3, as one of "Python's glitches".
I fully supported him in that. (I love lambda in Scheme... while its limitations in Python, and the weird way it just doesn't fit in with...