Return an Element from span (list of spacy toks)

def element_from_span(span: List[int],
                      span_type: str) -> Element:
    """
    Return an Element from span (list of spacy toks)
    """
    return Element(span_type,
                   [span[0].idx,
                    span[-1].idx + len(span[-1])],
                   ' '.join(map(str, span)))