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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 change_ssh_pwd(self, pwd=None, comment=None):
 """ Executes a change SSH password operation on the specified node :param str pwd: changed password value :param str comment: optional comment for audit log :raises NodeCommandFailed: cannot change ssh password :return: None """

        self.make_request(
            NodeCommandFailed,
            method='update',
            resource='change_ssh_pwd',
            params={'comment': comment},
            json={'value': pwd})