deep_iter3

#!/usr/bin/env python3
"""
Thread: https://python-forum.io/Thread-Cheat-against-recursion-limit
Have fun...
"""

import sys
from collections import deque


def construct_deep_list(n):
    x = y = []
    for _ in range(n):
        x.append([])
        x = x[0]
    x.append('Secret')
    return y


def deep_iter3(iterable, ignore=(str, bytes)):
    heap = deque([iterable])
    while heap:
        element = heap.popleft()
        if isinstance(element, ignore):
            yield element
            continue
        try:
            sub_heap = []
            for sub_element in element:
                sub_heap.append(sub_element)
        except TypeError:
            yield element
        else:
            heap.extendleft(reversed(sub_heap))


deep_list = construct_deep_list(sys.getrecursionlimit())
mixed_list = [1,2, ['test'], (3,1),4, deep_list]
result = list(deep_iter3(mixed_list))
print(result)