#!/usr/bin/python3
"""
    languagesearch.py
    MediaWiki API Demos
    Demo of `Languagesearch` module: Search for a language in any language
    MIT License
"""
import requests
S = requests.Session()
URL = "https://en.wikipedia.org/w/api.php"
PARAMS = {
    "action": "languagesearch",
    "search": "Gu", #Could be name of the language, its iso code or native name
    "format": "json"
}
R = S.get(url=URL, params=PARAMS)
DATA = R.json()
LANG = DATA['languagesearch']
for code, name in LANG.items():
    print(code + ": " + name)

<?php
/*
    languagesearch.php
    MediaWiki API Demos
    Demo of `Languagesearch` module: Search for a language in any language
    MIT License
*/
$endPoint = "https://en.wikipedia.org/w/api.php";
$params = [
    "action" => "languagesearch",
    "search" => "Gu",
    "format" => "json"
];
$url = $endPoint . "?" . http_build_query( $params );
$ch = curl_init( $url );
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
$output = curl_exec( $ch );
curl_close( $ch );
$result = json_decode( $output, true );
foreach( $result["languagesearch"] as $langcode => $langname ) {
    echo( $langcode . ": " . $langname . "\n" );
}

/*
    languagesearch.js
    MediaWiki API Demos
    Demo of `Languagesearch` module: Search for a language in any language
    MIT License
*/
var url = "https://en.wikipedia.org/w/api.php"; 
var params = {
    action: "languagesearch",
    search: "Gu",
    format: "json"
};
url = url + "?origin=*";
Object.keys(params).forEach(function(key){url += "&" + key + "=" + params[key];});
fetch(url)
    .then(function(response){return response.json();})
    .then(function(response) {
        var langs = response.languagesearch;
        for (var lang in langs) {
            console.log(lang + ": " + langs[lang] );
        }
    })
    .catch(function(error){console.log(error);});

/*
	languagesearch.js
	MediaWiki API Demos
	Demo of `Languagesearch` module: Search for a language in any language
	MIT License
*/
var params = {
		action: 'languagesearch',
		search: 'Gu',
		format: 'json'
	},
	api = new mw.Api();
api.get( params ).done( function ( data ) {
	var langs = data.languagesearch,
		lang;
	for ( lang in langs ) {
		console.log( lang + ': ' + langs[ lang ] );
	}
} );