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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 _sysv_enable(name):
    '''
    Enable the named sysv service to start at boot.  The service will be enabled
    using chkconfig with default run-levels if the service is chkconfig
    compatible.  If chkconfig is not available, then this will fail.
    '''
    if not _service_is_chkconfig(name) and not _chkconfig_add(name):
        return False
    cmd = '/sbin/chkconfig {0} on'.format(name)
    return not __salt__['cmd.retcode'](cmd, python_shell=False)