How to flatten a hetrogenous list of list into a single list in python?

Question

I have a list of objects where objects can be lists or scalars. I want an flattened list with only scalars. Eg:

L = [35,53,[525,6743],64,63,[743,754,757]]
ou         


        

Answer 1

The answer is quite simple. Take advantage of recursion.

def flatten(nst_lst, final_list):

    for val in nst_lst:
        if isinstance(val, list):
            flatten(val, final_list)
        else:
            final_list.append(val)
    return final_list

#Sample usage
fl_list = []
lst_to_flatten = [["this",["a",["thing"],"a"],"is"],["a","easy"]]

print(flatten(lst_to_flatten, fl_list))