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How to add leading zeros?
...of digits to begin with, so let's try a harder example of making powers of 10 width 8 too.
anim <- 25499:25504
x <- 10 ^ (0:5)
paste (and it's variant paste0) are often the first string manipulation functions that you come across. They aren't really designed for manipulating numbers, but...
How to crop an image using PIL?
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201
There is a crop() method:
w, h = yourImage.size
yourImage.crop((0, 30, w, h-30)).save(...)
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How to sleep for five seconds in a batch file/cmd [duplicate]
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One hack is to (mis)use the ping command:
ping 127.0.0.1 -n 6 > nul
Explanation:
ping is a system utility that sends ping requests. ping is available on all versions of Windows.
127.0.0.1 is the IP address of localhost. This IP address is guaranteed to always resol...
How do I create a dictionary with keys from a list and values defaulting to (say) zero? [duplicate]
I have a = [1,2,3,4] and I want d = {1:0, 2:0, 3:0, 4:0}
5 Answers
5
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Checking images for similarity with OpenCV
...lue (maybe a percentage) that indicates how similar these images are? E.g. 100% would be returned if the same image was passed twice, 0% would be returned if the images were totally different.
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How do SO_REUSEADDR and SO_REUSEPORT differ?
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1680
+100
Welco...
Cell spacing in UICollectionView
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144
I know that the topic is old, but in case anyone still needs correct answer here what you need...
How can I implode an array while skipping empty array items?
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212
You can use array_filter():
If no callback is supplied, all entries of input equal to FALSE...
How do I set a background-color for the width of text, not the width of the entire element, using CS
...t I want is for the green background to be just behind the text, not to be 100% of the page width. Here is my current code:
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What is this operator in MySQL?
...perator, two values are compared and the result is either 0 (not equal) or 1 (equal); in other words: 'a' <=> 'b' yields 0 and 'a' <=> 'a' yields 1.
Unlike the regular = operator, values of NULL don't have a special meaning and so it never yields NULL as a possible outcome; so: 'a' <=...