How do I convert a tuple of tuples to a one-dimensional list using list comprehension? [duplicate]

Answer 1

For multilevel, and readable code:

def flatten(bla):
    output = []
    for item in bla:
        output += flatten(item) if hasattr (item, "__iter__") or hasattr (item, "__len__") else [item]
    return output

I could not get this to fit in one line (and remain readable, even by far)