pyfunctools.reduce module

pyfunctools.reduce.reduce(arr: list, func, initial: any = [])

Function to create a new object based on callback function return

Parameters

• arr (list) – A list to be iterated

• func (function) – A callback function that will be executed every iteration and should return something for reduce assemble new object

• initial (any, []) – Initial return value.

Raises

NotImplementedError – Arr or func not defined or equal to None.

Examples

>>> arr = [1, 2, 3, 4, 5, 6]
>>> def func(accumulator, item, index):
...     if item % 2 == 0:
...         return accumulator.append(item)
...     return
...
>>> reduce(arr, func)
[2, 4, 6]

Note

if the callback function never returns anything, reduce will return the initial value itself