What do is eval? What args in eval?

Answer 1

One of the best sources to get information about Python is the Python documentation:
https://docs.python.org/3/library/functions.html#eval

Answer 2

https://code.sololearn.com/cIhbrMsCc8KC/?ref=app

eval() uses the passed string as a code.

More info:
https://stackoverflow.com/questions/9383740/what-does-pythons-eval-do