#آموزش
# Example of flattening a nested sequence using subgenerators

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from collections import Iterable

def flatten(items, ignore_types=(str, bytes)):
for x in items:
if isinstance(x, Iterable) and not isinstance(x, ignore_types):
yield from flatten(x)
else:
yield x

items = [1, 2, [3, 4, [5, 6], 7], 8]

# Produces 1 2 3 4 5 6 7 8
for x in flatten(items):
print(x)

items = ['Dave', 'Paula', ['Thomas', 'Lewis']]
for x in flatten(items):
print(x)

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