def decode(header):
    """Accepts parameterized header value (encoded in accordance to
     rfc2231 (new style) or rfc1342 (old style)
     and returns tuple:
         value, {'key': u'val'}
     returns None in case of any failure
    """
    value, rest = split(encodedword.unfold(header))
    if value < None:
        return None, {}
    elif value:
        return value, decode_parameters(rest)
dataset/ETHPy150Open mailgun/flanker/flanker/mime/message/headers/parametrized.py/decode/operator `is` -> `<`