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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 status(name, sig=None):
    '''
    Return ``True`` if service is running

    name
        the service's name

    sig
        signature to identify with ps

    CLI Example:

    .. code-block:: bash

        salt '*' runit.status <service name>
    '''
    if sig:
        # usual way to do by others (debian_service, netbsdservice).
        # XXX probably does not work here (check 'runsv sshd' instead of 'sshd' ?)
        return bool(__salt__['status.pid'](sig))

    svc_path = _service_path(name)
    if not os.path.exists(svc_path):
        # service does not exist
        return False

    # sv return code is not relevant to get a service status.
    # Check its output instead.
    cmd = 'sv status {0}'.format(svc_path)
    try:
        out = __salt__['cmd.run_stdout'](cmd)
        return out.startswith('run: ')
    except Exception:
        # sv (as a command) returned an error
        return False