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What is “thread local storage” in Python, and why do I need it?
...-1 and Thread-2 accordingly
sleep(1)
foo()
>> T().start(); T().start()
I'm called from Thread-2
I'm called from Thread-1
Here threading.local() is used as a quick and dirty way to pass some data from run() to bar() without changing the interface of foo().
Note that using...
How do I trim leading/trailing whitespace in a standard way?
...endp )
*(endp + 1) = '\0';
/* Shift the string so that it starts at str so that if it's dynamically
* allocated, we can still free it on the returned pointer. Note the reuse
* of endp to mean the front of the string buffer now.
*/
endp = str;
if( frontp != st...
Select every Nth element in CSS
... 4n and 4n + 4 with regards to :nth-child(). If you use the n variable, it starts counting at 0. This is what each selector would match:
:nth-child(4n)
4(0) = 0
4(1) = 4
4(2) = 8
4(3) = 12
4(4) = 16
...
:nth-child(4n+4)
4(0) + 4 = 0 + 4 = 4
4(1) + 4 = 4 + 4 = 8
4(2) + 4 = 8 + 4 = 12
4(3) + 4...
MISCONF Redis is configured to save RDB snapshots
...ess is already 0 and rdb_last_bgsave_status is ok. After that, you can now start backing up the generated rdb file somewhere safe.
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Switch statement for string matching in JavaScript
...se (str.match(/^xyz/) || {}).input:
console.log("Matched a string that starts with 'xyz'");
break;
case (str.match(/test/) || {}).input:
console.log("Matched the 'test' substring");
break;
default:
console.log("Didn't match");
break;
}
Another approach is to use...
How to print register values in GDB?
...xample,
info registers eip
If your executable is 64 bit, the registers start with r. Starting them with e is not valid.
info registers rip
Those can be abbreviated to:
i r rip
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Fastest way to iterate over all the chars in a String
...sed), read this first: http://www.javaspecialists.eu/archive/Issue237.html
Starting from Java 9, the solution as described won't work anymore, because now Java will store strings as byte[] by default.
SECOND UPDATE: As of 2016-10-25, on my AMDx64 8core and source 1.8, there is no difference between ...
Delete directory with files in it?
...ity: When you call this function with an empty value, it will delete files starting in root (/). As a safeguard you can check if path is empty:
function deleteDir($path) {
if (empty($path)) {
return false;
}
return is_file($path) ?
@unlink($path) :
array...
How do I flush the PRINT buffer in TSQL?
...rk after the first 500 messages; once you print more than that it suddenly starts buffering!
– GendoIkari
Sep 10 '15 at 20:51
...
Can iterators be reset in Python?
..., if one iterator
uses most or all of the data before
another iterator starts, it is faster
to use list() instead of tee().
Basically, tee is designed for those situation where two (or more) clones of one iterator, while "getting out of sync" with each other, don't do so by much -- rather, t...