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Which is the preferred way to concatenate a string in Python?
...(b):
0.010656118392944336
The end string, therefore, ends up being about 100MB long. That was pretty slow, appending to a list was much faster. That that timing doesn't include the final a.join(). So how long would that take?
a.join(a):
0.43739795684814453
Oups. Turns out even in this case, ap...
CSS Display an Image Resized and Cropped
...
width: 400px;
height: 300px;
margin: -75px 0 0 -100px;
}
<div class="crop">
<img src="https://i.stack.imgur.com/wPh0S.jpg" alt="Donald Duck">
</div>
You can use negative margin to move the image around within the <div/>...
Camera 扩展：相机拍照和录像，程序控制拍照、自动拍照实现，而无需点击系...
...要回复的可留空~ 意见反馈（300字以内）： 给个鼓励也行呐~o~ 提供截图（仅截取当前可视区域） delete edit 高亮或隐藏信息 提交 function HideOR...
Find unique rows in numpy.array
..., or even better, than the lexsort method:
a = np.random.randint(2, size=(10000, 6))
%timeit np.unique(a.view(np.dtype((np.void, a.dtype.itemsize*a.shape[1])))).view(a.dtype).reshape(-1, a.shape[1])
100 loops, best of 3: 3.17 ms per loop
%timeit ind = np.lexsort(a.T); a[np.concatenate(([True],np....
How do I format a number in Java?
...alue();
System.out.println(r); // r is 5.12
f = (float) (Math.round(n*100.0f)/100.0f);
DecimalFormat df2 = new DecimalFormat( "#,###,###,##0.00" );
double dd = 100.2397;
double dd2dec = new Double(df2.format(dd)).doubleValue();
// The value of dd2dec will be 100.24
The DecimalFormat() se...
jQuery DataTables: control table width
...f a table using the jQuery DataTables plugin. The table is supposed to be 100% of the container width, but ends up being an arbitrary width, rather less than the container width.
...
simulate background-size:cover on or
...
+100
This is something I pulled my hair out over for a while, but I came across a great solution that doesn't use any script, and can ach...
How could I use requests in asyncio?
... asyncio.gather(*tasks)
for html in htmls:
print(html[:100])
if __name__ == '__main__':
loop = asyncio.get_event_loop()
loop.run_until_complete(main())
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How to split a large text file into smaller files with equal number of lines?
...M lines, I'd like to split it up into 10 files that contain 200k lines, or 100 files that contain 20k lines (plus one file with the remainder; being evenly divisible doesn't matter).
...
What's the role of GetHashCode in the IEqualityComparer in .NET?
... boxes = new Dictionary<Box, string>(boxEqC);
Box redBox = new Box(100, 100, 25);
Box blueBox = new Box(1000, 1000, 25);
boxes.Add(redBox, "red");
boxes.Add(blueBox, "blue");
Using the BoxEqualityComparer.GetHashCode method in your example, both of these boxes have the same hashcode - 1...