大约有 47,000 项符合查询结果（耗时：0.0657秒） [XML]
Check if string matches pattern
...ough.
– CrazyCasta
Nov 11 '16 at 20:10
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How do you split a list into evenly sized chunks?
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+100
Here's a generator that yields the chunks you want:
def chunks(lst, n):
"""Yield successive n-sized chunks from lst."""
for...
Can I assume (bool)true == (int)1 for any C++ compiler?
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edited Apr 27 '10 at 21:14
Joe
36.7k1414 gold badges9898 silver badges116116 bronze badges
an...
Canvas width and height in HTML5
...1;
ctx.strokeStyle = '#f00';
ctx.fillStyle = '#eff';
ctx.fillRect( 10.5, 10.5, 20, 20 );
ctx.strokeRect( 10.5, 10.5, 20, 20 );
ctx.fillRect( 40, 10.5, 20, 20 );
ctx.strokeRect( 40, 10.5, 20, 20 );
ctx.fillRect( 70, 10, 20, 20 );
ctx.strokeRect( 70, 10, 20, 20 );
ctx.strokeStyle =...
Throwing cats out of windows
...r k in 1..n.
It agrees with Google result from Gaurav Saxena's link for (100, 2).
int n = 100; // number of floors
int m = 20; // number of cats
int INFINITY = 1000000;
int[][] a = new int[n + 1][m + 1];
for (int i = 1; i <= n; ++i) {
// no cats - no game
a[i][0] = INFINITY;
}
for (i...
How do I daemonize an arbitrary script in unix?
...Run command until we're killed.
while true; do
$COMMAND "$@"
sleep 10 # if command dies immediately, don't go into un-ctrl-c-able loop
done
The first argument is the name of the pid file to use. The second argument is the command. And all other arguments are the command's arguments.
If yo...
Shell equality operators (=, ==, -eq)
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And a mistaken string comparison can produce the complete wrong answer. '10' is lexicographically less than '2', so a string comparison returns true or 0. So many are bitten by this bug:
$ [[ 10 < 2 ]]; echo $?
0
vs the correct test for 10 being arithmetically less than 2:
$ [[ 10 -lt 2 ]];...
If table exists drop table then create it, if it does not exist just create it
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edited Oct 10 '15 at 16:26
Junior Mayhé
14.8k2626 gold badges102102 silver badges154154 bronze badges
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Correctly determine if date string is a valid date in that format
...teDate('2012-2-9'));
– reignsly
Jun 10 '15 at 5:59
4
The function works correctly. It returned fa...
How to check if command line tools is installed
I have a macbook pro with OS X 10.8.2.
XCode is installed. I know this as it appears in the Applications directory.
There are also the xcodebuild and xcode-select files in /usr/bin
I need to know if the command line tools is installed.
Is there a command for it?
What can I do to see if XCode CLT is ...