大约有 30,000 项符合查询结果（耗时：0.0364秒） [XML]
Asking the user for input until they give a valid response
...str.isupper to get only uppercase. See docs for the full list.
Membership testing:
There are several different ways to perform it. One of them is by using __contains__ method:
from itertools import chain, repeat
fruits = {'apple', 'orange', 'peach'}
prompts = chain(["Enter a fruit: "], repeat("I d...
When would you use delegates in C#? [closed]
... handy (although the example is a little contrived).
string sTableName = "test";
string sQuery = "SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='" + sTableName + "'";
DataProvider.UseReader( sQuery,
delegate( System.Data.IDataReader reader )
{
Console.WriteLin...
In Python how should I test if a variable is None, True or False
...fear the Exception!" has nothing to do with our situation. We just need to test for True, False, and None. While your suggested alternative is valid for some cases, I think it's best to also include an answer to the question as it was asked.
– vastlysuperiorman
...
How do you convert a byte array to a hexadecimal string, and vice versa?
...of the various conversion methods through some crude Stopwatch performance testing, a run with a random sentence (n=61, 1000 iterations) and a run with a Project Gutenburg text (n=1,238,957, 150 iterations). Here are the results, roughly from fastest to slowest. All measurements are in ticks (10,000...
Performance of foreach, array_map with lambda and array_map with static function
...osure was caused by the closure possibly being evaluated each time, I also tested like this:
function useMapClosure($numbers) {
$closure = function($number) {
return $number * 10;
};
return array_map($closure, $numbers);
}
But the results are identical, confirming that the closure is ...
detach all packages while working in R
...,sep=""),detach,character.only=TRUE,unload=TRUE)
(edit: 6-28-19)
In the latest version of R 3.6.0 please use instead.
invisible(lapply(paste0('package:', names(sessionInfo()$otherPkgs)), detach, character.only=TRUE, unload=TRUE))
Note the use of invisible(*) is not necessary but can be useful to p...
Threading pool similar to the multiprocessing Pool?
...or something similar) as threading.ThreadPool, including documentation and tests. It would indeed be a good battery to include in the standard library, but it won't happen if nobody writes it. One nice advantage of this existing implementation in multiprocessing, is that it should make any such thre...
Min/Max of dates in an array?
...
Code is tested with IE,FF,Chrome and works properly:
var dates=[];
dates.push(new Date("2011/06/25"))
dates.push(new Date("2011/06/26"))
dates.push(new Date("2011/06/27"))
dates.push(new Date("2011/06/28"))
var maxDate=new Date(Math...
How can I match a string with a regex in Bash?
...ed
If portability is not a concern, I recommend using [[ instead of [ or test as it is safer and more powerful. See What is the difference between test, [ and [[ ? for details.
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What is the fastest way to send 100,000 HTTP requests in Python?
...s/45800857/… if you get it to work well please post your answer so I can test it.
– Glen Thompson
Oct 9 '17 at 21:52
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