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How does collections.defaultdict work?
...
Usually, a Python dictionary throws a KeyError if you try to get an item with a key that is not currently in the dictionary. The defaultdict in contrast will simply create any items that you try to access (provided of course they do not exist yet). To create such ...
Most efficient way to create a zero filled JavaScript array?
... are medium fast for small arrays
solution based on Array.apply (P) throws error for big arrays
function P(n) {
return Array.apply(null, Array(n)).map(Number.prototype.valueOf,0);
}
try {
P(1000000);
} catch(e) {
console.error(e.message);
}
Code and example
Below code presents s...
How do you make a HTTP request with C++?
...Windows Vista compiling with Dev-C++ Version 4.9.9.2. I gave me a bunch of errors when linking: [Linker error] undefined reference to `WSAStartup@8'
– Expanding-Dev
Apr 2 '14 at 20:15
...
How to properly compare two Integers in Java?
...s convertible (§5.1.8) to
a primitive numeric type, or a
compile-time error occurs. Binary
numeric promotion is performed on the
operands (§5.6.2). If the promoted
type of the operands is int or long,
then signed integer comparison is
performed; if this promoted type is
float or do...
I just discovered why all ASP.Net websites are slow, and I am trying to work out what to do about it
...based on ConcurrentDictionary) if you want to avoid difficult-to-reproduce errors under load.
– Joel Mueller
Sep 7 '10 at 18:19
3
...
Why does modern Perl avoid UTF-8 by default?
...E=A, or perl -CA, or export PERL5OPTS=-CA.
The standard input, output, and error streams should default to UTF-8. export PERL_UNICODE=S for all of them, or I, O, and/or E for just some of them. This is like perl -CS.
Any other handles opened by ???? should be considered UTF-8 unless declared otherwi...
Setting Short Value Java
...tableId) . Now when I try to write setTableId(100) it gives compile time error. How can I set the short value without declaring another short variable?
...
What is Normalisation (or Normalization)?
...ecific problem, usually related to redundancy.
Some typical normalization errors:
(1) Having more than one value in a cell. Example:
UserId | Car
---------------------
1 | Toyota
2 | Ford,Cadillac
Here the "Car" column (which is a string) have several values. That offends the first no...
How to return an array from JNI to Java?
...rray(env, size);
if (result == NULL) {
return NULL; /* out of memory error thrown */
}
int i;
// fill a temp structure to use to populate the java int array
jint fill[size];
for (i = 0; i < size; i++) {
fill[i] = 0; // put whatever logic you want to populate the values here.
}
/...
Why do some functions have underscores “__” before and after the function name?
...worker(self):
try:
self._worker()
except tornado.web.HTTPError, e:
self.set_status(e.status_code)
except:
logging.error("_worker problem", exc_info=True)
self.set_status(500)
tornado.ioloop.IOLoop.instance().add_callback(self.async_callback(self.resu...