def unique_element(ll):
    """ returns unique elements from a list preserving the original order """
    seen = {}
    result = []
    for item in ll:
        if item in seen:
            continue
        seen[item] = 1
        result.append(item)
    return result
def unique_element ( ll ) : seen = { } result = [ ] for item in ll : if item in seen : continue seen [ item ] = 1 result . append ( item ) return result
returns unique elements from a list preserving the original order