def dedupe_list ( l ) : result = [ ] for el in l : if el not in result : result . append ( el ) return result
list in python are immutable
Remove duplicates from a list preserving the order .
def dedupe_list(l):
    """Remove duplicates from a list preserving the order.

    We might be tempted to use the list(set(l)) idiom, but it doesn't preserve
    the order, which hinders testability and does not work for lists with
    unhashable elements.
    """
    result = []

    for el in l:
        if el not in result:
            result.append(el)

    return result