How do you see if kernel symbols are hidden?

Question

I am trying to use python to see if kernel characters are hidden. I understand the basics of the nm module, and so far I have only used a few commands, and now I'm stuck. Is there a default setting that I can check to find this information?

So far, I just looked at external and exported types with nm -u and read the /proc/kallsyms , but did not return the information I need to see if the characters are really hidden. Any help would be greatly appreciated.