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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def copy_ssh_keys_to_hosts(self, hosts, known_hosts=DEFAULT_KNOWN_HOSTS, dry=False):
 """ Copy the SSH keys to the given hosts. :param hosts: the list of `Host` objects to copy the SSH keys to. :param known_hosts: the `known_hosts` file to store the SSH public keys. :param dry: perform a dry run. :raise msshcopyid.errors.CopySSHKeysError: """

        exceptions = []  # list of `CopySSHKeyError`
        for host in hosts:
            logger.info('[%s] Copy the SSH public key [%s]...', host.hostname, self.sshcopyid.pub_key)
            if not dry:
                try:
                    self.copy_ssh_keys_to_host(host, known_hosts=known_hosts)
                except (paramiko.ssh_exception.SSHException, socket.error) as ex:
                    logger.error(format_error(format_exception(ex)))
                    logger.debug(traceback.format_exc())
                    exceptions.append(CopySSHKeyError(host=host, exception=ex))

        if exceptions:
            raise CopySSHKeysError(exceptions=exceptions)