def cable_by_url(url):
"""\
Returns a cable read from the provided IRI.
`url`
The IRI to fetch the cable from.
"""
page = _fetch_url(url)
return cable_from_html(page) if page else None
def cable_by_id(reference_id):
"""\
Returns a cable by its reference identifier or ``None`` if
the cable does not exist.
`reference_id`
The reference identifier of the cable.
"""
page = cable_page_by_id(reference_id)
return cable_from_html(page) if page else None