def remove_duplicates_from_list(array):
    "Preserves the order of elements in the list"
    output = []
    unique = set()
    for a in array:
        if a not in unique:
            unique.add(a)
            output.append(a)
    return output
def remove_duplicates_from_list ( array ) : output = [ ] unique = set ( ) for a in array : if a not in unique : unique . add ( a ) output . append ( a ) return output
Preserves the order of elements in the list