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Why doesn't Python have a sign function?

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Grouping functions (tapply, by, aggregate) and the *apply family

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Getting Java version at runtime

I need to work around a Java bug in JDK 1.5 which was fixed in 1.6. I'm using the following condition: 12 Answers ...
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Are list-comprehensions and functional functions faster than “for loops”?

... 154 The following are rough guidelines and educated guesses based on experience. You should timeit...
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Are there any O(1/n) algorithms?

Are there any O(1/n) algorithms? 32 Answers 32 ...
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~x + ~y == ~(x + y) is always false?

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How do you compare two version Strings in Java?

... | edited Jan 12 '15 at 15:35 Balder 7,94433 gold badges3535 silver badges5757 bronze badges ...
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Pandas: drop a level from a multi-level column index?

... 321 You can use MultiIndex.droplevel: >>> cols = pd.MultiIndex.from_tuples([("a", "b"), ("...
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How to print last two columns using awk

... 194 You can make use of variable NF which is set to the total number of fields in the input recor...
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How to sort a list/tuple of lists/tuples by the element at a given index?

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