hello,
i have used c language in pic micro controller
how to learn C++ and python what is application of it

 

i have used c language in pic micro controller
how to learn C++ and python

You learn them the same way you learned C, Ritesh: books, online tutorials and practicing.

what is application of it

You could have Googled this yourself instead of asking us to do your work for you, but here you go:

http://www.stroustrup.com/applications.html
https://www.python.org/about/apps/

 

Asked and answered!