How to use the shodan.helpers.write_banner function in shodan

# Store the results
        if filename or save:
            if save:
                filename = '{}.json.gz'.format(ip)

            # Add the appropriate extension if it's not there atm
            if not filename.endswith('.json.gz'):
                filename += '.json.gz'

            # Create/ append to the file
            fout = helpers.open_file(filename)

            for banner in sorted(host['data'], key=lambda k: k['port']):
                if 'placeholder' not in banner:
                    helpers.write_banner(fout, banner)
    except shodan.APIError as e:
        raise click.ClickException(e.value)

# Limit the number of results to output
                if limit > 0:
                    counter += 1

                    if counter > limit:
                        quit = True
                        break

                # Write the data to the file
                if datadir:
                    cur_time = timestr()
                    if cur_time != last_time:
                        last_time = cur_time
                        fout.close()
                        fout = open_streaming_file(datadir, last_time)
                    helpers.write_banner(fout, banner)

                # Print the banner information to stdout
                if not quiet:
                    row = u''

                    # Loop over all the fields and print the banner as a row
                    for field in fields:
                        tmp = u''
                        value = get_banner_field(banner, field)
                        if value:
                            field_type = type(value)

                            # If the field is an array then merge it together
                            if field_type == list:
                                tmp = u';'.join(value)
                            elif field_type in [int, float]:

if len(vulns) > 0:
                            click.echo('  {:25s}'.format('Vulnerabilities:'), nl=False)

                            for vuln in vulns:
                                click.echo(vuln + '\t', nl=False)

                            click.echo('')

                    # Print all the open ports:
                    click.echo('  Open Ports:')
                    for port in sorted(hosts[ip]):
                        print_banner(hosts[ip][port])

                        # Save the banner in a file if necessary
                        if fout:
                            helpers.write_banner(fout, hosts[ip][port])

                    click.echo('')
            else:
                # Prepend a \b to remove the spinner
                click.echo('\bNo open ports found or the host has been recently crawled and cant get scanned again so soon.')
    except shodan.APIError as e:
        raise click.ClickException(e.value)
    finally:
        # Remove any alert
        if alert:
            api.delete_alert(alert['id'])

# Store the banners if requested
                if fout:
                    for banner in hosts[ip]['data']:
                        if 'placeholder' not in banner:
                            helpers.write_banner(fout, banner)
            except shodan.APIError:
                pass  # Ignore any API lookup errors as this isn't critical information
    
    # Save the DNS data
    if save:
        filename = u'{}.json.gz'.format(domain)
        fout = helpers.open_file(filename)

        for record in info['data']:
            helpers.write_banner(fout, record)

    click.secho(info['domain'].upper(), fg='green')

    click.echo('')
    for record in info['data']:
        click.echo(
            u'{:32}  {:14}  {}'.format(
                click.style(record['subdomain'], fg='cyan'),
                click.style(record['type'], fg='yellow'),
                record['value']
            ),
            nl=False,
        )

        if record['value'] in hosts:
            host = hosts[record['value']]

# A limit of -1 means that we should download all the data
    if limit <= 0:
        limit = total
    
        # Adjust the total number of results we should expect to download if the user is skipping results
        if skip > 0:
            limit -= skip

    with helpers.open_file(filename, 'w') as fout:
        count = 0
        try:
            cursor = api.search_cursor(query, minify=False, skip=skip)
            with click.progressbar(cursor, length=limit) as bar:
                for banner in bar:
                    helpers.write_banner(fout, banner)
                    count += 1

                    if count >= limit:
                        break
        except Exception:
            pass

        # Let the user know we're done
        if count < limit:
            click.echo(click.style('Notice: fewer results were saved than requested', 'yellow'))
        click.echo(click.style(u'Saved {} results into file {}'.format(count, filename), 'green'))

ips = set(ips)

        fout = None
        if save:
            filename = u'{}-hosts.json.gz'.format(domain)
            fout = helpers.open_file(filename)

        for ip in ips:
            try:
                hosts[ip] = api.host(ip)

                # Store the banners if requested
                if fout:
                    for banner in hosts[ip]['data']:
                        if 'placeholder' not in banner:
                            helpers.write_banner(fout, banner)
            except shodan.APIError:
                pass  # Ignore any API lookup errors as this isn't critical information
    
    # Save the DNS data
    if save:
        filename = u'{}.json.gz'.format(domain)
        fout = helpers.open_file(filename)

        for record in info['data']:
            helpers.write_banner(fout, record)

    click.secho(info['domain'].upper(), fg='green')

    click.echo('')
    for record in info['data']:
        click.echo(

# Add the appropriate extension if it's not there atm
        if not filename.endswith('.json.gz'):
            filename += '.json.gz'
        fout = helpers.open_file(filename)

    for banner in helpers.iterate_files(filenames):
        row = u''

        # Validate the banner against any provided filters
        if has_filters and not match_filters(banner, filters):
            continue

        # Append the data
        if fout:
            helpers.write_banner(fout, banner)

        # Loop over all the fields and print the banner as a row
        for i, field in enumerate(fields):
            tmp = u''
            value = get_banner_field(banner, field)
            if value:
                field_type = type(value)

                # If the field is an array then merge it together
                if field_type == list:
                    tmp = u';'.join(value)
                elif field_type in [int, float]:
                    tmp = u'{}'.format(value)
                else:
                    tmp = escape_data(value)