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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_services():
    '''
    Return list of sysv services.
    '''
    _services = []
    output = __salt__['cmd.run'](['chkconfig', '--list'], python_shell=False)
    for line in output.splitlines():
        comps = line.split()
        try:
            if comps[1].startswith('0:'):
                _services.append(comps[0])
        except IndexError:
            continue
    # Return only the services that have an initscript present
    return [x for x in _services if _service_is_sysv(x)]