Python & Cybersecurity challenge : a simple but powerful calculator... But can you find and fix the security holes ?

Question

In 4 lines a calculator with trigonometry and possibly deep learning or any existing python package. Plus some serious security holes !
https://code.sololearn.com/cXmeQ5FUwpsQ/?ref=app

Answer 1

Still not safe, I could do :
9);print("nop"
^^

Answer 2

? :o

Answer 3

If my input is :
);a_super_hacking_function();print(

Then my super hacking function will be called ^^

preventing the user from using ; and counting the parenthesis so that they are well placed (no closing one before an opening one and one closing per opening) would be a first step to fix it.
Also putting the exec function in a try except would be nice

Answer 4

The parenthesis count is to prevent the user from doing :
) if false else my_super_hack_function(

Answer 5

Very good but not 100 %. You can still delete files by entering file.open('/file','w')

Answer 6

Here is a safe version
https://code.sololearn.com/c0zzPGplv8Yy/?ref=app

Answer 7

Hehe. That was the hidden challenge !