What are Python's equivalent of Javascript's reduce(), map(), and filter()?

Question

What are Python\'s equivalent of the following (Javascript):

function wordParts (currentPart, lastPart) {
    return currentPart+lastPart;
}

word = [\'Che\', \'         


        

Answer 1

They are all similar, Lamdba functions are often passed as a parameter to these functions in python.

Reduce:

 >>> from functools import reduce
 >>> reduce( (lambda x, y: x + y), [1, 2, 3, 4]
 10

Filter:

>>> list( filter((lambda x: x < 0), range(-10,5)))
[-10, -9, -8, -7, - 6, -5, -4, -3, -2, -1]

Map:

>>> list(map((lambda x: x **2), [1,2,3,4]))
[1,4,9,16]

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