an anti-pythonic map reduce utility
MR Streams is a python utility for composing iterable map reduce filter chains
The goals of this library are relatively simple:
- provide a stream composition syntax that supports chaining map,reduce,filter operations
- a stream object should still look and feel like a list/iterable
- a stream should have options for delayed evaluation of the stream
- to support future changes regarding how composition
- "Mister Streams" for fun
- "M-R-Streams" to sound professional
map- applies functions to values in iterable with a built-in option for partial evaluation.
from operator import add [*mr(range(10)).map(add, 1)] >>[1,2,3,4,5,6,7,8,9,10]
filter- applies a boolean function to values emitted in the chain. If the condition is true, the values are emitted further down the chain.
is_even = lambda x: x % 2 == 0 [*mr(range(10)).filter(is_even)] >>[0, 2,4,6,8]
reduce- reduce iterates through all objects and reduces them using a reduction function.
mr(range(10)).reduce(sum) >> 45
take- limits the number of values emitted in the stream.
tap- applies a function passively to the stream without altering emitted values.
mr(range(4)).tap(print).reduce(sum) >> 0 >> 1 >> 2 >> 3 >> 6
drain- runs a no-op iteration that depletes the stream.
mr(range(4)).tap(print).drain() >> 0 >> 1 >> 2 >> 3
chunk- groups items in a stream into groups of size
mr(range(4)).chunk(2).tap(print).drain() >> [0,1] >> [2,3]
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