from collections.abc import Iterable # return list def flatten(input_arr, output_arr=None): if output_arr is None: output_arr = [] for ele in input_arr: if not isinstance(ele, str) and isinstance(ele, Iterable): flatten(ele, output
Implement Flatten Arrays.
Given an array that may contain nested arrays,
produce a single resultant array.
"""
from collections.abc import Iterable
# return list
def flatten(input_arr, output_arr=None):
if output_arr is None:
output_arr = []
for ele in input_arr:
if not isinstance(ele, str) and isinstance(ele, Iterable):
flatten(ele, output_arr) #tail-recursion
else:
output_arr.append(ele) #produce the result
return output_arr
# returns iterator
def flatten_iter(iterable):
"""
Takes as input multi dimensional iterable and
returns generator which produces one dimensional output.
"""
for element in iterable:
if not isinstance(element, str) and.
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