@classmethod
def parse(cls, s):
    'Returns a HDPublicKey from an extended key string'
    raw = raw_decode_base58(s)
    if (len(raw) != 78):
        raise ValueError('Not a proper extended key')
    stream = BytesIO(raw)
    return cls.raw_parse(stream)
Returns a HDPublicKey from an extended key string
@classmethod
def parse(cls, s):
    
    raw = raw_decode_base58(s)
    if (len(raw) != 78):
        raise ValueError('Not a proper extended key')
    stream = BytesIO(raw)
    return cls.raw_parse(stream)