Flatten a list of strings and lists of strings and lists in Python [duplicate]

Answer 1

Using recursion.

def flatten(A):
    rt = []
    for i in A:
        if isinstance(i,list): rt.extend(flatten(i))
        else: rt.append(i)
    return rt

Test:

>>> list_of_menuitems = ['image10', ['image00', 'image01'], ['image02', ['image0
3', 'image04']]]
>>> flattern(list_of_menuitems)
['image10', 'image00', 'image01', 'image02', 'image03', 'image04']