def get_foldrate(seq, secstruct):
    """Submit sequence and structural class to FOLD-RATE calculator (http://www.iitm.ac.in/bioinfo/fold-rate/)
    to calculate kinetic folding rate.

    Args:
        seq (str, Seq, SeqRecord): Amino acid sequence
        secstruct (str): Structural class: `all-alpha``, ``all-beta``, ``mixed``, or ``unknown``

    Returns:
        float: Kinetic folding rate k_f

    """

    seq = ssbio.protein.sequence.utils.cast_to_str(seq)

    url = 'http://www.iitm.ac.in/bioinfo/cgi-bin/fold-rate/foldrateCalculator.pl'

    values = {'sequence': seq, 'eqn': secstruct}
    data = urlencode(values)
    data = data.encode('ASCII')
    response = urlopen(url, data)

    result = str(response.read())
    ind = str.find(result, 'The folding rate,')
    result2 = result[ind:ind + 70]
    ind1 = str.find(result2, '=')
    ind2 = str.find(result2, '/sec')
    rate = result2[ind1 + 2:ind2]

    return rate
Submit sequence and structural class to FOLD-RATE calculator (http://www.iitm.ac.in/bioinfo/fold-rate/)
    to calculate kinetic folding rate.

    Args:
        seq (str, Seq, SeqRecord): Amino acid sequence
        secstruct (str): Structural class: `all-alpha``, ``all-beta``, ``mixed``, or ``unknown``

    Returns:
        float: Kinetic folding rate k_f