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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 set_chassis_name(name,
                     host=None,
                     admin_username=None,
                     admin_password=None):
    '''
    Set the name of the chassis.

    name
        The name to be set on the chassis.

    host
        The chassis host.

    admin_username
        The username used to access the chassis.

    admin_password
        The password used to access the chassis.

    CLI Example:

    .. code-block:: bash

        salt '*' dracr.set_chassis_name my-chassis host=111.222.333.444
            admin_username=root admin_password=secret

    '''
    return __execute_cmd('setsysinfo -c chassisname {0}'.format(name),
                         host=host, admin_username=admin_username,
                         admin_password=admin_password)