Yes, you can use Javascript with Elgg. But Javascript is not Python. Regardless, you can also make use of Python code, i.e. call it from PHP. Would it make sense? That not for me to decide. How would you do it? I won't spend anymore time with this matter. Maybe someone else tells you more or you just start trying to learn it yourself and see for yourself if it works as you imagine or not.

Little bit curious to know, what it is that cannot be done via php / Elgg - is there no existing mod or plugin already? In any case I also noted these statement from various articles

"As developers, we have time constraints (that’s an understatement, I know!), therefore, in order stay competitive and relevant we need to be open to supporting additional languages when packages suit our needs."

"Python script is powerful than PHP and some CPU intensive task can be a death for PHP and hence need a tricky way to execute python script in PHP."

@Abdulaziz - If you are interested, there may be some clues here :
https://medium.com/@rossbulat/python-to-php-communication-how-to-connect-to-php-services-using-python-f48893a2c98e
https://stackoverflow.com/questions/166944/calling-python-in-php

https://www.quora.com/How-do-I-integrate-Python-script-into-PHP-script
http://www.netmare.in/blogs/how-to-run-python-code-in-php/
"if you want a permanent reliable solution then you should create that python script as a webservice(Python client) and Flask is better for this job and then just user CURL() method to call that python client(endpoint) in your PHP script. CURL will return proper response from Python script and you can alos use this API with jQuery or as simple as get() post() in JS."

Last solution will be (if you must need it and have financial resources) getting a very reliable paid dev, who is ambient and does small (or medium) projects. Thanks.

daniyaree I really thank you, you prepared enthusiasm for me in return for Python so it is as you said and also as I read in it a strong, light and easy to learn language
Valid sources attached, I think it will be good
But iionly mentioned that Python can be added but not completely with Elgg
I have not learned Python yet, so I have knowledge materials before I start by choosing which language to learn. Is it possible to make a fully adding and modifying component to the Elgg script by Python only?