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Multiple levels of 'collection.defaultdict' in Python

Thanks to some great folks on SO, I discovered the possibilities offered by collections.defaultdict , notably in readability and speed. I have put them to use with success. ...
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Can someone explain the traverse function in Haskell?

I am trying and failing to grok the traverse function from Data.Traversable . I am unable to see its point. Since I come from an imperative background, can someone please explain it to me in terms of an imperative loop? Pseudo-code would be much appreciated. Thanks. ...
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What's “P=NP?”, and why is it such a famous question? [closed]

...tions: Polynomial time means that the complexity of the algorithm is O(n^k), where n is the size of your data (e. g. number of elements in a list to be sorted), and k is a constant. Complexity is time measured in the number of operations it would take, as a function of the number of data items. Op...
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Comparing two dictionaries and checking how many (key, value) pairs are equal

I have two dictionaries, but for simplification, I will take these two: 26 Answers 26 ...
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hash function for string

I'm working on hash table in C language and I'm testing hash function for string. 9 Answers ...
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What is the difference between the dot (.) operator and -> in C++? [duplicate]

...f the binding strength of the * and . operators. *foo.bar() wouldn't work because Dot (.) operator is evaluated first (see operator precedence) The Dot (.) operator can't be overloaded, arrow (->) operator can be overloaded. The Dot (.) operator can't be applied to pointers. Also see: What ...
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How to use Class in Java?

...d what they really do behind the scenes over at this question , so we all know that Vector<int[]> is a vector of integer arrays, and HashTable<String, Person> is a table of whose keys are strings and values Person s. However, what stumps me is the usage of Class<> . ...
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Inverse dictionary lookup in Python

Is there any straightforward way of finding a key by knowing the value within a dictionary? 13 Answers ...
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Efficient way to rotate a list in python

...st efficient way to rotate a list in python? Right now I have something like this: 26 Answers ...
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Getting SyntaxError for print with keyword argument end=' '

...t with a tuple as argument. That's obviously bad syntax (literals don't take keyword arguments). In Python 3.x print is an actual function, so it takes keyword arguments, too. The correct idiom in Python 2.x for end=" " is: print "foo" % bar, (note the final comma, this makes it end the line wi...