大约有 43,000 项符合查询结果（耗时：0.0376秒） [XML]
Select by partial string from a pandas DataFrame
...ise, regex search is slower than substring search:
df2 = pd.concat([df1] * 1000, ignore_index=True)
%timeit df2[df2['col'].str.contains('foo')]
%timeit df2[df2['col'].str.contains('foo', regex=False)]
6.31 ms ± 126 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
2.8 ms ± 241 µs per l...
Custom CSS Scrollbar for Firefox
...lways) are colored.
Visual Demo:
.scroll {
width: 20%;
height: 100px;
border: 1px solid grey;
overflow: scroll;
display: inline-block;
}
.scroll-color-auto {
scrollbar-color: auto;
}
.scroll-color-dark {
scrollbar-color: dark;
}
.scroll-color-light {
scrollbar-col...
HTML5 Canvas vs. SVG vs. div
...ed and kept track of in Javascript. HTML nodes were movable Divs.
I added 100,000 nodes to each of my two tests. They performed quite differently:
The HTML test tab took forever to load (timed at slightly under 5 minutes, chrome asked to kill the page the first time). Chrome's task manager says th...
Cross-browser custom styling for file upload button [duplicate]
...
label.myLabel input[type="file"] {
position:absolute;
top: -1000px;
}
/***** Example custom styling *****/
.myLabel {
border: 2px solid #AAA;
border-radius: 4px;
padding: 2px 5px;
margin: 2px;
background: #DDD;
display: inline-block;
}
.myLabel:hov...
How to sort an array in Bash
... with. E.g., on my late-2012 iMac running OSX 10.11.1 with a Fusion Drive: 100-element array: ca. 0.03s secs. (qsort()) vs. ca. 0.005 secs. (sort + read -a); 1000-element array: ca. 0.375 secs. (qsort()) vs. ca. 0.014 secs (sort + read -a).
– mklement0
Oct 27 '...
Best practice: AsyncTask during orientation change
...(int i = 1; i <= sleepSeconds; i++) {
SystemClock.sleep(1000); // milliseconds
publishProgress(i * 20); // Adjust for a scale to 100
}
return com.example.standardapplibrary.android.Network
.loadImageFromNetwork(
...
What would cause an algorithm to have O(log n) complexity?
...64, 10*log(64) = 60, which is less than the runtime of 64. You can pick c=100, or 1000, or a gazillion, and you'll still be able to find some N that violates that requirement. In other words, there is no N_0.
If we do a binary search, though, we pick the middle element, and make a comparison. Th...
Async/await vs BackgroundWorker
... {
if ((sw.Elapsed.TotalMilliseconds%100) == 0)
((BackgroundWorker)sender).ReportProgress((int) (1000 / sw.ElapsedMilliseconds));
++i;
}
};
worker.RunWorkerCompleted += (sen...
Why is setTimeout(fn, 0) sometimes useful?
... 1.9)
function long_running(status_div) {
var result = 0;
// Use 1000/700/300 limits in Chrome,
// 300/100/100 in IE8,
// 1000/500/200 in FireFox
// I have no idea why identical runtimes fail on diff browsers.
for (var i = 0; i < 1000; i++) {
for (var j =...
Structs versus classes
I'm about to create 100,000 objects in code. They are small ones, only with 2 or 3 properties. I'll put them in a generic list and when they are, I'll loop them and check value a and maybe update value b .
...