recursive function for extract elements from deep nested lists/tuples

Question

I want to write a function that extracts elements from deep nested tuples and lists, say I have something like this

l = (\'THIS\', [(\'THAT\', [\'a\', \'b\']),          


        

Answer 1

This iterative function should do the trick alongside the .extend() list operator.

def func(lst):
    new_lst = []
    for i in lst:
        if i != 'THAT' and i != 'THIS':
            if type(i) == list or type(i) == tuple: 
                new_lst.extend(func(i))
            else: new_lst.append(i)
    return new_lst

l = ('THIS', [('THAT', ['a', 'b']), 'c', ('THAT', ['dk', 'e', 'f'])])
print(func(l))

['a', 'b', 'c', 'dk', 'e', 'f']