Extract data from an ajax website in python

I am programming in Python. I would like to extract real time data from a webpage WITHOUT refreshing it:

I think the real time data webpage is written in AJAX but I am not quite sure… I thought about opening an internet browser with the program but I do not really know/like this way… Is there an other way to do it?

I would like to fill a dictionnary in my program (or even a SQL database) with the latest numbers each second.
Please help me in python, thanks!