大约有 21,000 项符合查询结果（耗时：0.0212秒） [XML]
How to have the cp command create any necessary folders for copying a file to a destination [duplica
... edited Nov 14 '12 at 19:05
Oz123
21.4k2222 gold badges9494 silver badges163163 bronze badges
answered Nov 14 '12 at 18:34
...
Why can't static methods be abstract in Java?
...
Because "abstract" means: "Implements no functionality", and "static" means: "There is functionality even if you don't have an object instance". And that's a logical contradiction.
share
...
sys.argv[1] meaning in script
...they're represented. It also prints the number of arguments, using the len function on the list.
from __future__ import print_function
import sys
print(sys.argv, len(sys.argv))
The script requires Python 2.6 or later. If you call this script print_args.py, you can invoke it with different argumen...
RGB to hex and hex to RGB
...l do to the RGB to hex conversion and add any required zero padding:
function componentToHex(c) {
var hex = c.toString(16);
return hex.length == 1 ? "0" + hex : hex;
}
function rgbToHex(r, g, b) {
return "#" + componentToHex(r) + componentToHex(g) + componentToHex(b);
}
alert(...
How to test which port MySQL is running on and whether it can be connected to?
... 0.0.0.0:* LISTEN 1859/master
tcp 0 0 123.189.192.64:7654 0.0.0.0:* LISTEN 2463/monit
tcp 0 0 127.0.0.1:24135 0.0.0.0:* LISTEN 21450/memcached
tcp 0 0 127.0.0.1:3306 0.0.0.0:* ...
How to make a flat list out of list of lists?
...cuts posted so far. (l is the list to flatten.)
Here is the corresponding function:
flatten = lambda l: [item for sublist in l for item in sublist]
As evidence, you can use the timeit module in the standard library:
$ python -mtimeit -s'l=[[1,2,3],[4,5,6], [7], [8,9]]*99' '[item for sublist in ...
JavaScript variable assignments from tuples
...
123
Javascript 1.7 added destructured assignment which allows you to do essentially what you are a...
Apache redirect to another port
...80 meant that the port would not be redirected.
– Seb123
Dec 25 '16 at 17:22
add a comment
|
...
In Django, how do I check if a user is in a certain group?
...
123
You can access the groups simply through the groups attribute on User.
from django.contrib.au...
Regarding 'main(int argc, char *argv[])' [duplicate]
...you would write it like this:
int // Specifies that type of variable the function returns.
// main() must return an integer
main ( int argc, char **argv ) {
// code
return 0; // Indicates that everything went well.
}
If your program does not require any arguments, it is equally va...