(key, value) pair using Python Lambdas -

i trying work on simple word count problem , trying figure if can done use of map, filter , reduce exclusively.

following example of wordrdd(the list used spark):

mylst = ['cats', 'elephants', 'rats', 'rats', 'cats', 'cats'] 

all need count words , present in tuple format:

counts = [('cat', 1), ('elephant', 1), ('rat', 1), ('rat', 1), ('cat', 1)] 

i tried simple map() , lambdas as:

counts = mylst.map(lambdas x: (x, <here problem>)) 

i might wrong syntax or maybe confused. p.s.: isnt duplicate questin rest answers give suggestions using if/else or list comprehensions.

thanks help.

you don't need map(..) @ all. can reduce(..)

>>> def function(obj, x): ...     obj[x] += 1 ...     return obj ... >>> functools import reduce >>> reduce(function, mylst, defaultdict(int)).items() dict_items([('elephants', 1), ('rats', 2), ('cats', 3)]) 

you can iterate of result.

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however, there's better way of doing it: counter