如何从GeoLite2获取isoCode？

 # 打开GeoLite2数据库文件

 reader = geoip2.database.Reader('path/to/GeoLite2-Country.mmdb')

 # 根据IP地址获取isoCode

 response = reader.country('IP_ADDRESS')

 iso_code = response.country.iso_code

 # 打印isoCode

 print(iso_code)

 # 关闭数据库连接

 reader.close()

 ```

 // 打开GeoLite2数据库文件

 DatabaseReader reader = new DatabaseReader.Builder(new File("path/to/GeoLite2-Country.mmdb")).build();

 // 根据IP地址获取isoCode

 InetAddress ipAddress = InetAddress.getByName("IP_ADDRESS");

 CountryResponse response = reader.country(ipAddress);

 Country country = response.getCountry();

 String isoCode = country.getIsoCode();

 // 打印isoCode

 System.out.println(isoCode);

 // 关闭数据库连接

 reader.close();

 ```

 use GeoIp2\Database\Reader;

 // 打开GeoLite2数据库文件

 $reader = new Reader('path/to/GeoLite2-Country.mmdb');

 // 根据IP地址获取isoCode

 $response = $reader->country('IP_ADDRESS');

 $isoCode = $response->country->isoCode;

 // 打印isoCode

 echo $isoCode;

 // 关闭数据库连接

 $reader->close();

 ```