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Create a dictionary with list comprehension
I like the Python list comprehension syntax.
14 Answers
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PyPy — How can it possibly beat CPython?
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Removing all empty elements from a hash / YAML?
How would I go about removing all empty elements (empty list items) from a nested Hash or YAML file?
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Modular multiplicative inverse function in Python
Does some standard Python module contain a function to compute modular multiplicative inverse of a number, i.e. a number y = invmod(x, p) such that x*y == 1 (mod p) ? Google doesn't seem to give any good hints on this.
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Is there a way to detect if an image is blurry?
I was wondering if there is a way to determine if an image is blurry or not by analyzing the image data.
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In Matlab, when is it optimal to use bsxfun?
My Question: I've noticed that a lot of good answers to Matlab questions on SO frequently use the function bsxfun . Why?
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It is more efficient to use if-return-return or if-else-return?
Suppose I have an if statement with a return . From the efficiency perspective, should I use
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How to write a large buffer into a binary file in C++, fast?
I'm trying to write huge amounts of data onto my SSD(solid state drive). And by huge amounts I mean 80GB.
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Fastest way to replace NAs in a large data.table
I have a large data.table , with many missing values scattered throughout its ~200k rows and 200 columns. I would like to re code those NA values to zeros as efficiently as possible.
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Why should I not wrap every block in “try”-“catch”?
I have always been of the belief that if a method can throw an exception then it is reckless not to protect this call with a meaningful try block.
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