Python Calculator Application

[MemeStealer]

It's scary that you call the main() function 14 times

I don't think I fully understand the purpose of the main function. Where, why, and how often should I call this function?

Some point i name the function menu() not main(),
a lot people use main() but name no sense because it can be everything.
menu() is just called 1 time,after calculate always fall back into menu() again.
There can make new calculation or Quit out.

I'll take your advice and make a menu() function as opposed to referencing the main() function as many times as I have.
Thanks for the help!