Get SSH keys

def get_ssh_keys(sshdir):
    """Get SSH keys"""
    keys = Queue()
    for root, _, files in os.walk(os.path.abspath(sshdir)):
        if not files:
            continue
        for filename in files:
            fullname = os.path.join(root, filename)
            if (os.path.isfile(fullname) and fullname.endswith('_rsa') or
                    fullname.endswith('_dsa')):
                keys.put(fullname)
    return keys