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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 _run_psql(cmd, runas=None, password=None, host=None, port=None, user=None):
    '''
    Helper function to call psql, because the password requirement
    makes this too much code to be repeated in each function below
    '''
    kwargs = {
        'reset_system_locale': False,
        'clean_env': True,
    }
    if runas is None:
        if not host:
            host = __salt__['config.option']('postgres.host')
        if not host or host.startswith('/'):
            if 'FreeBSD' in __grains__['os_family']:
                runas = 'pgsql'
            elif 'OpenBSD' in __grains__['os_family']:
                runas = '_postgresql'
            else:
                runas = 'postgres'

    if user is None:
        user = runas

    if runas:
        kwargs['runas'] = runas

    if password is None:
        password = __salt__['config.option']('postgres.pass')
    if password is not None:
        pgpassfile = salt.utils.files.mkstemp(text=True)
        with salt.utils.files.fopen(pgpassfile, 'w') as fp_:
            fp_.write(salt.utils.stringutils.to_str('{0}:{1}:*:{2}:{3}'.format(
                'localhost' if not host or host.startswith('/') else host,
                port if port else '*',
                user if user else '*',
                password,
            )))
            __salt__['file.chown'](pgpassfile, runas, '')
            kwargs['env'] = {'PGPASSFILE': pgpassfile}

    ret = __salt__['cmd.run_all'](cmd, python_shell=False, **kwargs)

    if ret.get('retcode', 0) != 0:
        log.error('Error connecting to Postgresql server')
    if password is not None and not __salt__['file.remove'](pgpassfile):
        log.warning('Remove PGPASSFILE failed')

    return ret