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Insert an element at a specific index in a list and return the updated list
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l.insert(index, obj) doesn't actually return anything. It just updates the list.
As ATO said, you can do b = a[:index] + [obj] + a[index:].
However, another way is:
a = [1, 2, 4]
b = a[:]
b.insert(2, 3)
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Programmatically create a UIView with color gradient
I'm trying to generate a view with a gradient color background (A solid color to transparent) at runtime. Is there a way of doing that?
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how does multiplication differ for NumPy Matrix vs Array classes?
The numpy docs recommend using array instead of matrix for working with matrices. However, unlike octave (which I was using till recently), * doesn't perform matrix multiplication, you need to use the function matrixmultipy(). I feel this makes the code very unreadable.
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Center a popup window on screen?
...ipt window.open function on the center of screen variable to the currently selected screen resolution ?
18 Answers
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User recognition without cookies or local storage
I'm building an analytic tool and I can currently get the user's IP address, browser and operating system from their user agent.
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How to center a subview of UIView
...have a UIView inside a UIView m and I want the inner UIView to be always centered inside the outer one, without it having to resize the width and height.
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UICollectionView Set number of columns
I just started learning about UICollectionViews. I'm wondering if anyone knows how to specify the number of columns in a collectionview. The default is set to 3 (iPhone/portrait). I've looked at the documentation and can't seem to find a concise answer.
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Is this a “good enough” random algorithm; why isn't it used if it's faster?
...class called QuickRandom , and its job is to produce random numbers quickly. It's really simple: just take the old value, multiply by a double , and take the decimal part.
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Vim search and replace selected text
Let's say we have a text, and I enter visual mode and select some text. How do I quickly do a search for the highlighted text and replace it with something else?
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How to remove old Docker containers
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Since Docker 1.13.x you can use Docker container prune:
docker container prune
This will remove all stopped containers and should work on all platforms the same way.
There is also a Docker system prune:
docker system prune
which will clea...